SPECIALIST PRODUCTS

Satellite Roller Screws

Satellite roller screws

Call: 01386 421 005
Email: sales@abssac.co.uk
Web: www.abssac.co.uk

SATELLITE ROLLER SCREWS

Satellite Roller Screws Photo 1

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Introduction

ROLLVIS satellite roller screws are used to transform rotary movements into linear movements and vice versa. The bearing elements are threaded rollers between the screw and the nut. The high number of points of contact enables satellite roller screws to support very heavy loads.

The ROLLVIS manufacturing programme comprises satellite roller screws without roller recycling (types RV and BRV) and with roller recycling (type RVR), in a range of accuracy classes.

The ROLLVIS range also Includes other types such as the reverse roller screw (type RVI) and the differential screw (type RVD).

Satellite roller screws compared to ball screws

The satellite roller screw is similar to the ball screw with the difference that the load transfer elements are threaded rollers.

The main advantage of satellite roller screws is that they have a high number of points of contact to support the load.

Load capacity and lifespan

The main advantage of roller screws compared to ball screws is that their admissible static and dynamic load capacities are higher.

The bearing function is ensured by threaded rollers instead of balls and the load is spread over a higher number of points of contact

Satellite Roller Screws Photo 3

Satellite roller screws like ball screws use Hertz's law.

The admissible Hertz pressure is the same for satellite roller screws and ball screws. Satellite roller screws thus have a static load 3 times greater than that of ball screws and their lifespan is 15 times longer.

Speed & acceleration

Satelitte roller screws can rotate much faster and support much greater acceleration.

RV and BRV satellite roller screws are designed so that the rollers are not recycled. This means the memanism can support twice the rotation speed of a ball screw. Acceleration can reach up to 3g.

Lead & pitch

Planetary roller screw can be achieved with smaller leads compared to ball screws.

As the lead is a function of the pitch of the planetary roller screw, the lead can be very small (0.5mm and even less).

Planetary roller screws can be achieved with entire or real numbers (i.e. lead of 3.32mm per revolution), which avoid reduction gears. This is an advantage compared to ball screws. The lead can be chosen and realised without any geometrical changes of both the screw shaft and the nut body, which allows updates with minor changes.

In a ball screw the lead is limited by the dimension (OD) of the bearing ball, which is a standard feature.

Rigidity & strength

The many points of contact give a satellite roller screw greater rigidity and shock tolerance than a ball screw.

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Types of roller screws

RV and BRV screws

The main elements of RV and BRV satellite roller screws are the screw, the nut and satellite rollers.

The screw has a multiple-start thread. The angle between the flanks is 90° and the profile is triangular. The nut has an internal thread identical to that of the screw. The rollers have a single-start thread with an angle the same as that of the nut. This ensures there is no axial movement between the nut and the rollers. The rollers do not therefore need to be recycled.

The flanks of the roller thread are convex. At each end of the rollers there is a cylindrical pivot and gear teeth. The pivots are mounted in the holes of the end rings, thus ensuring the rollers are equidistant. The end rings are floated in the nut body and axially secured with circlips.

The gear teeth engage in gear wheels fixed in the nut. This guides the rollers parallel to the axis to ensure perfect functioning.

RV and BRV screws

RVR screws

RVR satellite roller screws have very fine threads and are used when very great positioning accuracy is required along with high rigidity and load-carrying capacity.

The main elements of RVR satellite roller screws are the screw, the nut and the rollers which are guided and maintained at the correct distance in a cage.

The screw has a single- or two-start thread with a triangular profile. The angle between the flanks is 90°. The nut has the same internal thread as the screw. The rollers are not threaded but have grooves perpendicular to the screw axis.

The distance between the grooves matches the exposed thread of the screw and nut. The flanks are convex and the angle between them is 90°.

When the screw or nut rotates, the rollers are axially displaced in the nut. After a complete revolution, each roller is retumed to its initial position by two cams at the end of each nut They can be recycled this way because there is a groove the length of the nut.

The cage pockets are slightly longer than the rollers to enable them to move axially within the nut.

RVR screws

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Types of roller screws

RVI screws

RVI satellite roller screws work on the same principle as RV and BRV screws except that their nut system is reversed.

This means the rollers themselves rotate around the screw (instead of the nut in RV and BRV screws) and move axially within the nut.

Apart from the screw threading where the rollers orbit, the journal is smooth and can have a special shape (e.g.: antirotation).

The nut is threaded along its entire length and is much longer than on RV and BRV screws. It governs the overall travel of the complete screw and therefore limits it if needed.

RVI screws

RVD screws

The RVD differential screw is actually a variant of the RV and BRV screws.

Its components, expertly calculated and adjusted, are used to produce extremely fine threads (less than 0.02 mm).

The movement of the rollers in this somewhat complex mechanism does however prevent a wide range of travel.

The nuts are larger than on the RV and BRV types.

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Identification system

Example: 6-- --- R3. 5. / 30. 210 RV

Design

RV = ground thread, non-recycling rollers
BRV = rolled thread, non-recycling rollers
RVR = ground thread, recycling rollers
RVI = ground thread - reverse system
RVD = ground thread - differential screw

Nut types

1 = single nut
2 = split nut
3 = double nut

Nut design

1 = cylindrical nut
6 = nut with flange at one end
7 = nut with central flange
8 = special nut design

Seal

0 = without wipers
1 = with wipers

Screw diameter d₀

in mm

Nominal lead P

in mm

Thread direction

R = right
B = right/left
L = left

Thread accuracy

G1 = 6 μm/300 mm
G3 = 12 μm/300 mm
G5 = 23 μm/300 mm
G9 = 200 μm/1000 mm (BRV only)

6-digit number to identify customer's specification

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Accuracy

Satellite roller screws are divided into tolerance classes based on DIN 69051, part 3 (ball screws). The determining factor is the lead error V_300p referred to a thread length of 300 mm.

The table below shows the tolerance classes:

Tolerance CI	V_300p
G1	6 μm/300 mm
G3	12 μm/300 mm
G5	23 μm/300 mm
G9	200 μm/1000 mm

Positioning satellite roller screws are supplied in tolerance classes G1, G3 and G5 and transport satellite roller screws (type BRV) in tolerance class G9.

Lead error

The lead error e_p relative to effective travel L_u is calculated for the transport sotellite roller screw by the following formula:

e_p = 2 . L_u
1000 . V_300p

Lead errors e_p for positioning satellite roller screws are shown in the table opposite. For tolerance classes G1 and G3, the lead and torque diagrams are supplied with the screws.

Lead is checked by a 3D measuring machine or on a measuring bench equipped with a laser interferometer

Lead accuracy symbols according to DIN 69051/3

P: nominal lead
e₀: difference between required lead and nominal lead
V_300p: difference between actual and nominal lead over 300 mm
e_p: difference between actual and nominal lead over a length Lu
V_up: travel variation over a length Lu
V_2πp: travel variation over one revolution
L_u: effective travel

more	than	G1	G3	G5
L_u		Ep in microns for tolerance class up to
	315 mm	6	12	23
315 mm	400 mm	7	13	25
400 mm	500 mm	8	15	27
500 mm	630 mm	9	16	30
630 mm	800 mm	10	18	35
800 mm	1000 mm	11	21	40
1000 mm	1250 mm	13	24	46
1250 mm	1600 mm	15	29	54
1600 mm	2000 mm			65
2000 mm	2500 mm			77
2500 mm	3150 mm			93

Efficiency

Satellite Roller Screws Efficiency

Rollvis satellite roller screws achieve high rates of mechanical efficiency. The figure opposite shows efficiency rates η1 for the ascent and η2 for the descent, according to the helix angle. The efficiency of a trapezoidal thread screw is shown for comparison. Satellite roller screws, unlike friction screws, are not self-locking.

Advantages

High axial load capacity
High efficiency
No backlash
Extremely high rigidity

Accuracy greater than 6 μm/300 mm
High rotation speed (RV and BRV systems)
Small leads (from 0.25 mm) with wide diameters (system RVR)
Fast acceleration and deceleration

Applications

Rollvis satellite roller screws have proved their superior worth in many fields of applications such as:

Machine tools
Measuring machines
Specific machines (benders)
Robotics
Aeronautics (aeroplanes and helicopters)
Space (rockets and sotellites)

Defence (tanks, cannons, missiles, etc.)
Oil industry
Nuclear industry
Medical
Chemical industry
Optical

Telescopes
Graphics
Laser machines
Injection moulding machines
Car industry

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Geometry

Nut geometry and shape

Standard satellite roller screws are available with 3 nut designs:

• single nut (ES)
• split nut (EF)
• double nut (ED)

Single nuts have low axial backlash of 0.01 to 0.03 mm. The split cylindrical nut is preloaded by clamping the two halves of the nut in a housing. A precision spacer ring is mounted between the two halves to maintain the required level of preloading. Split nuts with a flange at one end have a spacer ring designed to hold the halves apart. The halves are aligned by a parallel key. Double nuts are preloaded in the same way as split nuts.

SINGLE NUTS

• Nuts in one piece with axial backlash
• Wipers (if requested by the customer)

SPLIT NUTS

• Nuts in two pieces, preloaded,
without backlash
• Same dimensions as single nuts
• Reduced load capacities
• Wipers (if requested by the customer)

DOUBLE NUTS

• Two single nuts, preloaded,
without backlash
• Same load capacities as single nuts
• About twice as long as single nuts
• Wipers (if requested by the customer)

FLANGE SHAPES

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Preloading

Preloaded nuts are used to eliminate backlash and increase rigidity.

Preloading should be carefully calculated to achieve the highest rate of efficiency and the longest possible lifespan (see figure above).

For preloaded nuts, in addition to the individual loads F₁...F_n, preload F_v must also be taken into account to determine the mean load F_m. This yields new individual loads F_1v...F_nv.

If for example an absence of backlash is required for all operational loads, preload F_v must be selected according to the maximum load F_max.

F_v = F_max
2.83 [N]

If a satellite roller screw only needs to be backlash-free for a specific load, preload F_v should be selected according to the corresponding load F_n.

F_v = F_n
2.83 [N]

Unless the customer othenwise requests, split and double nuts are preloaded in the standard version to a maximum of 5% of the dynamic load capacity.

Resulting load depending on preload F_v

An axial load on a preloaded nut system increases the load of one of the halves and relieves the other from the preloading force. The resulting load can be estimated by the following equations:

Loaded half of nut:

F_nv(1) = F_v + 0.65 . F_n [N] if F_n < 2.83 . F_v [N]

F_nv(1) = F_n [N] if F_n ≥ 2.83 . F_v [N]

Relieved half of nut:

F_nv(2) = F_v - 0.35 . F_n [N] if F_n < 2.83 . F_v [N]

F_nv(2) = 0 [N] if F_n ≥ 2.83 . F_v [N]

F₁...F_n: [N] : individual loads
F_v: [N] : preloading force
F_nv: [N] : load resulting from the individual load and preloading
F_ma: [N] : mean load taking into account preloading

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Preloading examples

Preloading with rigid spacer (thickness calibrated by Rollvis SA)

Preloading flange nut with rigid spacer
Flange nut

Preloading cylindrical nut with rigid spacer
Cylindrical nut

Preloading with elastic washers

Preloading flange nut with elastic washers
Flange nut

Elastic washers

Preloading cylindrical nut with elastic washers
Cylindrical nut

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Mean speed and axial load

For variable speed and load, lifespan should be calculated with mean values nm and Fm.

For variable speed and constant load with speed n, the mean speed nm is used (figure below).

n_m = q₁
100 .n₁ + q₂
100 .n₂ + ... [min^-1]

For a variable load at constant speed, the mean load Fm is used (figure below).

F_m = ∛ F₁³. q₁
100 + F₂³. q₂
100 + ... [N]

For a variable load at variable speed, the mean load Fm is used.

F_m = ∛ F₁³. q₁
100 . n₁
n_m + F₂³. q₂
100 . n₂
n_m + ... [N]

Mean speed and axial load Photo 3

For a variable linear load at constant speed,
the mean load Fm is used (figure below).

F_m = F_min + 2. F_max
3 [N]

n_m: [min^-1] : mean speed
n₁...n_n: [min^-1] : individual speeds
q₁...q_n: [%] : time percentage
F_m: [N] : mean load
F ; F₁...F_n ; F_min; F_max: [N] : actual forces

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Nominal lifespan

The nominal lifespan L₁₀ or L_h, of a satellite roller screw is attained with a probability of 90%.

If greater reliability is required, the nominal lifespan L₁₀ or L_h, must be multiplied by the reliability factor f_r (table opposite).

Modified lifespan L_n = L₁₀ . f_r [revolutions]

or L_hn = L_h . f_r [h]

Reliability %	f_r
90	1
95	0.62
96	0.53
97	0.44
98	0.33
99	0.21

Nominal lifespan of single nuts (with backlash)

The nominal lifespan of single nuts is calculated by the following formula:

L₁₀ = ( C
f_m ) ³ . 10⁶ [revolutions]

L_h = L₁₀
n_m . 60 [h]

If the lifespan is predetermined, the dynamic load capacity is calculated as follows:

C = F_m ∛ L₁₀
10⁶ [N]

The lifespan in actual hours l_hN is calculated by the following formula:

L_hN = L_h
f_N [h]

The utilisation factor f_N is calculated as follows:

F_N = Lifespan of satellite roller screws
Expected lifespan of the machine

Nominal lifespan of preloaded nuts

For preloaded nuts, it is first necessary to calculate the lifespan of each half of the nut with the corresponding dynamic load capacity C and the mean axial load F_ma (including preload).

The total lifespan L₁₀ of the preloaded nut is obtained with the two lifespan values L₁₀₍₁₎ and L₁₀₍₂₎ (in revolutions).

L₁₀₍₁₎ = ( C
f_ma(1) ) ³ . 10⁶ [revolutions]

L₁₀₍₂₎ = ( C
f_ma(2) ) ³ . 10⁶ [revolutions]

L₁₀ = ( L₁₀₍₁₎^-10/9 + L₁₀₍₂₎^-10/9 ) ^-9/10 [revolutions]

L_n: [revolutions] : modified lifespan (revolutions)
L_hn: [h] : modified lifespan (hours)
L₁₀: [revolutions] : nominal lifespan (revolutions)
L_h: [h] : nominal lifespan (hours)
L_hN: [h] : lifetime in actual hours
f_r: [-] : reliability factor

C: [N] : dynamic load capacity
F_m: [N] : mean load (single nut with backlash)
F_ma: [N] : mean load (preloaded nut)
n_m: [min^-1] : mean speed
f_N: [-] : utilisation factor

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Rigidity

Satellite roller screw rigidity

The overall rigidity C_ges of a satellite roller screw is made up of the following individual rigidity values:

C_me: nut rigidity
C_sp: screw rigidity

C_L: bearing rigidity
C_U: rigidity of the surrounding construction

Nut rigidity C_s

Nut rigidity C_s can be determined by the follovvng simplified formula:

C_s = 164 . d₀²
L [N/μm]

Nut rigidity C_me

The rigidity C_me of a complete satellite roller screw nut can be approximated with the following formula:

C_me = f_m . f_k . F_n^1/3 [N/μm]

f_m for single nut ES = 0.75

f_m for split nut EF = 1

f_m for double nut ED = 1.5

The following condition is set for F_n for the C_me values shown in the table for standard preloading:

F_n = 2.83 . F_v [N]

Permissible buckling force F_knzul at rotation speed n = 0

Permissible buckling force can be calculated by the following formula:

F_knzul = 0.8 . 101.6 . f_kn . d₀⁴
L² [kN]

F_v: [N] : preloading force
F_n: [N] : axial load
C_me: [N/μm] : nut rigidity
C_s: [N/μm] : screw rigidity
f_k: [N^2/3/μm] : rigidity factor

f_m: [-] : correction factor
L: [mm] : free screw length
d₀: [mm] : nominal diameter of screw
F_knzul: [N] : permissible buckling force
f_kn: [-] : correction factor for bearing type

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Rotation speed

Permissible rotation speed and axial load

Satellite roller screws are restricted by the internal configuration of the nut, the bearings at the end of the screw and the critical number of revolutions n_kr due to flexural vibration.

The value of the permissible speed applied can be:

RV : d₀ . n ≤ 140'000

RVR : d₀ . n ≤ 32'000

Critical speed nkr with axial load Fn = 0

Critical speed is influenced by the axial load. It can be calculated on request for every satellite roller screw configuration.

When the correct screw end bearings are chosen, their maximum speed will have no effect on the desired speed. All that needs to be detemnined is the critical speed n_kr for flexural vibration.

The critical speed n_kr for flexural vibration can be calculated by the formula below. The correction factor f_kr depends on the type of bearing and the clamping conditions (figure above).

The calculation is based on the assumption that satellite roller screw nuts provide no guidance and the bearings at the screw end are considered rigid in the radial direction.

n_kr = 108 . 10⁶ . d₀ . 1
L ² [min^-1]

The permissible critical speed can be calculated by taking the bearing type into account:

n_krzul = 0.8 . n_kr . f _kr [min^-1]

n: [min^-1] : rotation speed
n_kr: [min^-1] : critical rotation speed
n_krzul: [min^-1] : permissible critical rotation speed
L: [mm] : free screw length

d₀: [mm] : nominal diameter of screw
f_kr: [-] : correction factor for bearing type
0,8: [-] : safety factor

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Driving torque

Driving torque diagram

Driving torque

All the values for motor rating can be calculated by the formulas below.
Note that the load-free torque M, must be taken into account for preloaded nuts (based on preloading F_v).
For single nuts with backlash, the formula is: M_v = 0 [Nm]

Motor driving torque MM at constant speed

Load-free torque

M_v = F_v . P . i . c
2000 . π [Nm]

« Ascent » load torque

M_L1 = P . i . F
2000 . π . η₁ [Nm]

« Descent » load torque

The frictional forces of the guide slideway
must be taken into account in feed force F.

M_L2 = P . i . F . η₂
2000 . π [Nm]

Motor driving torque

If, as is possible in « Descent » mode, the motor driving torque is negative, the motor must have a brake.

M_M = (M_v + M_L1,2 + M_R . i) [Nm]

Motor driving power

P_M = M_M . n_M
9.55 [W]

d: [mm] : external diameter of screw
d₂: [mm] : core diameter of screw
P: [mm] : screw lead
L: [mm] : length of satellite roller screw
m_T: [kg] : mass to move
D₁: [mm] : diameter of driving wheel
D₂: [mm] : diameter of driven wheel
i: [-] : reduction ratio
F_BBBBB: [N] : feed force
F_v: [N] : preloading force

F_a: [N] : acceleration force
M_v: [Nm] : load-free torque
M_L1: [Nm] : « ascent » load torque at constant speed
M_L2: [Nm] : « descent » load torque at constant speed
M_M: [Nm] : motor driving torque
M_La: [Nm] : load torque on acceleration
M_B: [Nm] : acceleration torque
M_Ma: [Nm] : motor driving torque on acceleration
M_R: [Nm] : frictional torque of screw bearings
J_M: [kgm²] : moment of inertia of motor

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Motor driving torque M_Ma with acceleration

The rotary moment of inertia of screw JR is a rough estimate. We shall be happy to calculate the exact value on request

Load torque

M_La = P . i . (F + F₂)
2000 . π . η₁ [Nm]

Translatory moment of inertia

J_T = m_T . ( P
2 . π ) ² . 10⁶ [kgm²]

Rotary moment of inertia (screw)

J_R = 4.8 . (d₁ + d₂)⁴ . L . 10^-14 [kgm²] (for steel)

Sum of reduced moments of inertia

J = J_M + J₁ + i² (J_R + J_T + J₂) [kgm²]

Motor speed

n_M = v . 6 . 10⁴
P . i [Min^-1]

Acceleration torque M_B = f (n_M)

M_B = n_M . J
9.55 . t_B . η [Nm]

Acceleration torque M_B = f (s_B)

M_B = 4 . π . s_B . J
P . i . t_B² . η [Nm]

Acceleration time t_B = f (n_M)

t_B = n_M . J
9.55 . M_B . η [s]

Acceleration time t_B = f (s_B)

t_B = √ 4 . π . s_B . J
P . i . M_B . η [s]

Rotation speed reached after acceleration

n_M = 120 . s_B
P . i . t_B [Min^-1]

Path travelled during acceleration

s_B = n_M . t_B . P . i
120 [mm]

Motor driving torque

M_Ma = (M_v + M_La + M _R . i . M_B) [Nm]

Motor driving power

P_Ma = M_Ma . n_M
9.55 [W]

J_R: [kgm²] : rotary moment of inertia of screw
J_T: [kgm²] : translatory moment of inertia of screw
J: [kgm²] : moment of inertia
J₁: [kgm²] : moment of inertia of driving wheel
J₂: [kgm²] : moment of inertia of driven wheel
P_M: [W] : driving power of motor at constant speed
P_Ma: [W] : driving power of motor on acceleration
s_B: [mm] : acceleration path
t_B: [s] : acceleration time
v: [m/s] : speed rate

n_M: [min^-1] : rotation speed of motor
η: [-] : mechanical efficiency of gearing
η₁: [-] : mechanical efficiency of satellite roller screw
for « ascent » η₁ = 0,71 ... 0,89
η₂: [-] : mechanical efficiency of satellite roller screw
for « descent » η₂ = 0,61 ... 0,85
c: [-] : coefficient of fridion referred to preloading
c = 0,1 ... 0,5

(for efficiencies η₁ + η₁ see page 6)

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Calculation example

Satellite roller screws RV 20 x 5

Nominal diameter: : d₀ = 20 mm
Lead: : P = 5 mm
Nut: : split nut (EF), preloaded
Mounting position: : horizontal
Load direction: : both sides
Rapid mode: : one side, opposite to working load

N^o	Operating mode	Time percentage q [%]	Rotation speed n [min^-1]	Axial load Fⁿ [N]
1	Peak load	q₁ = 5	n₁ = 15	F₁ = 8300
2	Roughing feed	q₂ = 40	n₂ = 110	F₂ = 4500
3	Finishing feed	q₃ = 50	n₃ = 70	F₃ = 4200
4	Rapid	q₄ = 5	n₄ = 1700	F₄ = 1150

Mean speed

n_m = 5
100 . 15 + 40
100 . 110 + 50
100 . 70 + 5
100 . 1700 = 165 min^-1

Preloading

Preloading is defined for the « finishing feed »
operating mode (F₃ = 4200 N).

F_v = 4200
2.83 = 1484 N

Load on nut half 1

Nut half 1 is loaded in operating modes 1, 2 and 3.
As F₁, F₂ and F₃ ≥ 2,83 F_v :

F_nv = F_n hence F_1V = 8300 N
F_2V = 4500 N
F_3V = 4200 N

Nut half 1 is only partly loaded in operating mode 4.
As F₄ = 1150 N < 2,83 F_v :

F_4v = 1484 - 0,35 . 1150 = 1082 N

Load on nut half 2

Nut half 2 is loaded in operating mode 4.
Nut half 2 is not loaded in operating modes 1, 2 and 3.

F_1v = F_2v = F_3v = 0

As F₄ < 2,83 . F_v :

F_4v = 1484 + 0.65 . 1150 = 2232 N

Mean load

Nut 1

F_ma(1) = ∛ 8300³ . 15
165 . 5
100 + 4500³ . 110
165 . 40
100 + 4200³ . 70
165 . 50
100 + 1082³ . 1700
165 . 5
100 = 3511 N

Nut 2

F_ma(2) = ∛ 2232³ . 1700
165 . 5
100 = 1789 N

Lifespan

Dynamic load capacity of a nut C = 23 400 N
Half nut 1

L₁₀₍₁₎ = ( 23400
3511 ) ³ . 10⁶ = 296 . 10⁶ revolutions

Half nut 2

L₁₀₍₂₎ = ( 23400
1789 ) ³ . 10⁶ = 2237 . 10⁶ revolutions

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Total lifespan

L₁₀ = [ (296 . 10⁶) ^-10/9 + (2237 . 10⁶) ^-10/9 ] ^-9/10

L₁₀ = 270 . 10⁶ revolutions

Lifespan in hours (with utilisation factor f_N = 0,6)

L_hN = 270 . 10⁶
165 . 0.6 . 60 = 45 450 h

Nut rigidity

C_me = 1 . 42.5 . 4200^1/3 = 686 N/μm

Satellite roller screw rigidity

Free length between fixed bearing and nut 1 = 1000 mm
Nominal diameter of screw d₁ = 20 mm

C_S = 164 . 20²
1000 = 66 N/μm

Bearing rigidity

C₁ = 850 N/μm (assumed value)

Total rigidity of satellite roller screw system

1
C_ges = 1
686 + 1
66 + 1
850 C_ges = 56 N/μm

Driving torque

Driving torque MM is calculated for the peak load of F₁ = 8300 N.
The screw is directly driven by the motor (i = 1).

Load-free torque:

M_v = 1484 . 5 . 1 . 0.43
2000 . π = 0.5 Nm

Load torque:

M_L1 = 5 . 1 . 8300
2000 . π . 0.87 = 7.6 Nm

Frictional torque of bearings:

M_R = 0.2 Nm (assumed)

Peak driving torque of motor at constant speed:

M_Mmax = 0.5 + 7.6 + 0.2 = 8.3 Nm

Motor driving power reaches its peak in rapid mode with F₄ = 1150 N.
Load torque:

M_L4 = 5 . 1 . 1150
2000 . π . 0.87 = 1,05 Nm

Peak driving power of motor at constant speed:

P_Mmax = (1.05 + 0,5 + 0.2) . 1700
9.55 = 312 W

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Lubrication

As a general rule, the same lubricants are used for satellite roller screws as for roller bearings, i.e. either oil or grease. The type of lubricant used mostly depends on operating and maintenance conditions. Unless the customer explicitly instructs otherwise, standard Rollvis grease is applied at the factory.

Oil lubrication

Circulating mineral oils with EP additives to enhance resistance to aging and corrosion in compliance with CL based on DIN 51517, part 2, are especially suitable for the lubrication of satellite roller screws. Speed, ambient temperature and operating temperature are determining factors in the choice of viscosity.

The amount of oil required depends on the screw diameter, the number of supporting rollers and the amount of heat to dissipate. 1 cm³/h (for small screw diameters) to 30 cm³/h (for large screw diameters) can be used as reference values.

The shortest possible lubrication intervals (...5 minutes) are recommended for high loads and longer intervals (5 minutes to 1 hr) for low loads. Automatic lubrication is recommended for high loads and speeds.

For immersion lubrication, the oil level should be such that the bottommost roller is completely submerged in the oil. The amount of oil and the oil-change intervals depend on the loading and installation.

The viscosity of the oil should be chosen to enable an adequate film of lubricant to form on the contact surfaces.

Figure a shows the operating viscosity V_K to achieve for the mean speed of the satellite roller screw and screw diameter.

Viscosity V_K ensures a state of lubrication to fulfil the nominal lifespan provided the lubrication system is free of foreign bodies.

Nominal viscosity can be calculated on the basis of viscosity V_K with the viscosity-temperature diagram (diagram V-t, figure b) and the operating temperature. Nominal viscosity is the viscosity of oil at 40°C. Viscosity classes ISO VG (DIN 51519) are plotted in diagram V-t.

Figure a shows the nominal diameters of RV satellite roller screws. The diameters of RVR satellite roller screws are slightly different. The requisite operating viscosity values can be obtained by interpolation.

Intermediate values can be obtained from the steps. These must be rounded up to the nearest viscosity value.

The operating temperature must be known or estimated to calculate nominal viscosity. The operating temperature must be measured on the nut after stabilisation. A suitable oil can be found in oil suppliers' lists with the nominal viscosity at 40°C. In general, an operating temperature of 30°C can be taken as a basis for selecting a lubricant.

Example:Satellite roller screw RV 39 x 10
Mean operating speed: n_m = 1400 min^-1
Operating temperature (estimated): t = 25 °C

In figure a, for a number of revolutions n_m = 1400 min^-1 and a nominal diameter of 39mm, the nominal viscosity is V_K = 33 mm²/s. In diagram V-t (figure b), the 25°C temperature and 34 mm²/s viscosity lines intersect between ISO VG 15 and ISO VG 22. The oil to choose will be in viscosity class VG 22.

A suitable CLP (DIN 51517) or HLP (DIN 51525) oil can be selected from this class.

Grease lubrication

The best grease lubricants to use are KP (DIN 51825, part 3) with a consistency factor of 2.
Lubrication intervals depend on the screw arrangement, size and operating conditions. Rollvis can provide recommendations for any type of application.

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Figure a

Figure b

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Handling advice

Assembly

If possible, the nut and screw should not be
dismantled. However, should this be necessary,
an assembly sleeve must be used.

External diameter d₃ of assembly sleeve:
d₃ = d₂^0
-0,05
(d₂ = screw core diameter)

Screw assembly

The following points must be followed when assembling the screw:

Align the screw and slide guideways axially parallel.
Fix the nut in housing.
Run the nut along the entire length of the thread
and check the screw for ease of movement.

CAUTION

RV screws always have a multiple-start thread. If the friction torque is different after the nut is reassembled, the nut must be taken off again and refitted on the next thread start until friction torque is correct!

Handling

Please read the following handling instructions carefully.
To ensure optimal operation and a long lifespan for satellite roller screws, the following points must be scrupulously complied with.
If in doubt, please contact Rollvis.

Lubrication

Satellite roller screws are greased prior to shipment (unless oil lubrication is requested).
Do not remove this grease. Only use this type of grease for relubrication.

Transport

Handle screws with care: do not drop them or damage the thread.

Installation

Do not unscrew the nut (or only with an assembly sleeve).
Carefully align satellite roller screws parallel to the guideways.
Alignment errors will damage satellite roller screws.

Storage

Only remove satellite roller screws from their original packing just before installation.

Bending

Avoid applying radial forces to the nut.

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	3.5 x 1	3	3.5	3.62	3.35	0.86	8.3	6.5	32.6	5.2	3.2	20.5	410	3.0	15	35	31	41	16.0	10	2
RV	5 x 1	3	4.5	4.62	4.35	0.85	10.3	7.8	33.0	6.5	3.9	20.8	520	4.0	19	39	31	41	20.3	10	3
RV	5 x 2	3	4.5	4.71	4.17	0.88	7.2	7.8	23.0	4.5	3.9	14.5	300	4.0	19	39	31	41	20.3	10	3
RV	5 x 3	3	4.5	4.78	3.97	0.88	5.3	7.5	18.8	3.4	3.7	11.8	210	4.0	19	39	31	41	20.3	10	3
RV	7 x 1	4	7	7.09	6.89	0.84	11.7	10.9	46.3	7.4	5.5	29.2	480	4.0	19	41	31	41	20.3	10	3
RV	7 x 2	4	7	7.16	6.76	0.88	9.3	11.4	32.3	5.9	5.7	20.3	300	4.0	19	41	31	41	20.3	10	3
RV	7 x 3	4	7	7.23	6.62	0.89	7.6	11.1	26.2	4.8	5.6	16.5	210	4.0	19	41	31	41	20.3	10	3
RV	7 x 4	4	7	7.28	6.47	0.89	6.6	11.0	22.9	4.2	5.5	14.4	170	4.0	19	41	31	41	20.3	10	3
RV	7 x 5	4	7	7.33	6.32	0.90	5.4	10.0	19.6	3.4	5.0	12.4	140	4.0	19	41	31	41	20.3	10	3
RV	8 x 1	4	8	8.09	7.89	0.83	11.5	10.7	43.8	1.2	5.4	27.6	570	5.0	21	41	31	41	22.3	10	3
RV	8 x 2	4	8	8.17	7.76	0.87	9.2	11.4	30.4	5.8	5.7	19.1	360	5.0	21	41	31	41	22.3	10	3
RV	8 x 3	4	8	8.24	7.63	0.89	7.5	11.0	24.1	4.7	5.5	15.2	260	5.0	21	41	31	41	22.3	10	3
RV	8 x 4	4	8	8.30	7.49	0.89	6.7	11.1	21.4	4.2	5.6	13.5	210	5.0	21	41	31	41	22.3	10	3
RV	8 x 5	4	8	8.35	7.33	0.89	5.8	10.7	18.9	3.7	5.3	11.9	170	5.0	21	41	31	41	22.3	10	3
RV	8 x 6	4	8	8.38	7.34	0.90	5.0	10.2	17.1	3.2	5.1	10.8	140	5.0	21	41	31	41	22.3	10	3
RV	10 x 1	4	10.5	10.59	10.38	0.80	18.7	17.6	55.3	11.8	8.8	34.8	600	6.0	26	48	31	41	27.3	10	3
RV	10 x 2	5	10.5	10.64	10.31	0.86	13.1	18.1	46.4	8.3	9.1	29.2	410	6.0	24	46	31	41	25.3	10	3
RV	10 x 3	5	10.5	10.70	10.21	0.88	11.3	17.9	36.9	7.1	9.0	23.3	300	6.0	24	46	31	41	25.3	10	3
RV	10 x 4	5	10.5	10.75	10.10	0.89	10.5	18.2	32.6	6.6	9.1	20.5	240	6.0	24	46	31	41	25.3	10	3
RV	10 x 5	5	10.5	10.79	9.98	0.89	9.6	17.9	29.1	6.0	9.0	18.3	200	6.0	24	46	31	41	25.3	10	3
RV	12 x 1	4	12	12.09	11.89	0.79	19.0	17.2	51.6	12.0	8.6	32.5	760	8.0	30	50	31	41	31.3	10	3
RV	12 x 2	5	12	12.14	11.81	0.85	12.8	18.0	43.5	8.1	9.0	27.4	520	8.0	26	46	31	41	27.3	10	3
RV	12 x 3	5	12	12.22	11.74	0.87	11.2	18.1	34.9	7.1	9.1	22.0	390	8.0	26	46	31	41	27.3	10	3
RV	12 x 4	5	12	12.25	11.65	0.89	10.0	17.8	29.9	6.3	8.9	18.8	310	8.0	26	46	31	41	27.3	10	3
RV	12 x 5	5	12	12.32	11.56	0.89	10.5	18.1	27.3	6.6	9.1	17.2	260	8.0	26	46	31	41	27.3	10	3
RV	12 x 8	5	12	12.42	11.13	0.90	8.3	15.7	20.4	5.2	7.8	12.8	170	8.0	26	46	31	41	27.3	10	3

Maximum backlash of single nuts: 0.03mm (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	15 x 2	5	15	15.14	14.81	0.84	19.3	26.3	51.1	12.2	13.2	32.2	600	10	34	56	35	51	35.7	14	4
RV	15 x 3	5	15	15.22	14.74	0.86	17.4	27.3	41.5	10.9	13.6	26.1	460	10	34	56	35	51	35.7	14	4
RV	15 x 4	5	15	15.25	14.65	0.88	15.9	27.6	35.7	10.0	13.8	22.5	370	10	34	56	35	51	35.7	14	4
RV	15 x 5	5	15	15.32	14.56	0.89	15.0	27.8	32.2	9.4	13.9	20.3	310	10	34	56	35	51	35.7	14	4
RV	15 x 6	5	15	15.37	14.47	0.89	15.2	27.3	29.2	9.6	13.6	18.4	270	10	34	56	35	51	35.7	14	4
RV	15 x 8	5	15	15.46	14.16	0.90	13.9	25.3	24.4	8.7	12.6	15.4	210	10	34	56	35	51	35.7	14	4
RV	20 x 2	5	19.5	19.65	19.32	0.82	47.8	59.7	80.3	30.1	29.8	50.6	1070	20	42	64	55	65	43.7	20	4
RV	20 x 3	5	19.5	19.71	19.22	0.85	43.7	63.3	64.9	27.6	31.7	40.9	840	20	42	64	55	65	43.7	20	4
RV	20 x 4	5	19.5	19.80	19.15	0.87	40.2	64.3	55.7	25.3	32.2	35.1	700	20	42	64	55	65	43.7	20	4
RV	20 x 5	5	19.5	19.83	19.02	0.88	371	64.0	49.1	23.4	32.0	31.0	590	20	42	64	55	65	43.7	20	4
RV	20 x 6	5	19.5	19.94	18.97	0.88	38.4	64.0	44.8	24.2	32.0	28.2	520	20	42	64	55	65	43.7	20	4
RV	20 x 8	5	19.5	19.98	18.69	0.89	38.2	64.0	39.2	24.1	32.0	24.7	410	20	42	64	55	65	43.7	20	4
RV	20 x 10	5	19.5	20.04	18.62	0.90	42.9	61.9	34.7	27.0	30.9	21.9	340	20	42	64	55	65	43.7	20	4
RV	21 x 2	5	21	21.14	20.82	0.81	51.1	63.5	81.5	32.2	31.8	51.4	1290	25	45	68	54	64	47	20	5
RV	21 x 3	5	21	21.21	20.72	0.84	46.9	67.7	65.7	29.6	33.8	41.4	1030	25	45	68	54	64	47	20	5
RV	21 x 4	5	21	21.28	20.62	0.86	43.2	68.9	56.5	27.2	34.5	35.6	850	25	45	68	54	64	47	20	5
RV	21 x 5	5	21	21.33	20.52	0.87	39.9	68.8	49.8	25.2	34.4	31.4	730	25	45	68	54	64	47	20	5
RV	21 x 6	5	21	21.39	20.42	0.88	41.5	69.0	45.3	26.1	34.5	28.6	630	25	45	68	54	64	47	20	5
RV	21 x 8	5	21	21.49	20.19	0.89	41.4	69.3	39.7	26.1	34.6	25.0	500	25	45	68	54	64	47	20	5
RV	21 x 10	5	21	21.58	19.96	0.89	46.7	67.2	35.1	29.4	33.6	22.1	420	25	45	68	54	64	47	20	5
RV	23 x 2	5	22.5	22.65	22.32	0.80	54.4	67.2	82.7	34.3	33.6	52.1	1490	30	45	67	55	65	46.7	20	4
RV	23 x 3	5	22.5	22.72	22.24	0.84	50.0	71.9	66.5	31.5	36.0	41.9	1200	30	45	67	55	65	46.7	20	4
RV	23 x 4	5	22.5	22.79	22.15	0.86	46.2	73.5	57.2	29.1	36.8	36.1	1000	30	45	67	55	65	46.7	20	4
RV	23 x 5	5	22.5	22.87	22.06	0.87	42.7	73.5	50.4	26.9	36.8	31.8	860	30	45	67	55	65	46.7	20	4
RV	23 x 6	5	22.5	22.89	21.97	0.88	44.4	73.9	45.9	28.0	36.9	28.9	750	30	45	67	55	65	46.7	20	4
RV	23 x 8	5	22.5	23.00	21.71	0.89	44.6	74.5	40.2	28.1	37.2	25.3	600	30	45	67	55	65	46.7	20	4
RV	23 x 10	5	22.5	23.12	21.62	0.89	50.3	72.4	35.6	31.7	36.2	22.4	500	30	45	67	55	65	46.7	20	4

Maximum backlash of single nuts: 0.03mm (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	25 x 2	5	24	24.14	23.82	0.80	78.0	93.2	100.5	49.1	46.6	63.3	1690	35	53	84	64	78	55.5	25	6
RV	25 x 4	5	24	24.28	23.63	0.85	66.5	102.6	69.5	41.9	51.3	43.8	1140	35	53	84	64	78	55.5	25	6
RV	25 x 5	5	24	24.34	23.53	0.87	62.5	104.2	61.9	39.4	52.1	39.0	980	35	53	84	64	78	55.5	25	6
RV	25 x 6	5	24	24.40	23.42	0.87	64.4	103.9	55.9	40.6	51.9	35.2	860	35	53	84	64	78	55.5	25	6
RV	25 x 8	5	24	24.51	23.21	0.89	75.3	104.8	48.7	47.5	52.4	30.7	690	35	53	84	64	78	55.5	25	6
RV	25 x 10	5	24	24.60	22.98	0.89	84.1	103.6	43.6	53.0	51.8	27.5	570	35	53	84	64	78	55.5	25	6
RV	27 x 2	5	27	27.14	26.82	0.78	87.8	103.5	103.4	55.3	51.7	65.2	1810	40	53	83	65	79	55.2	20	5
RV	27 x 4	5	27	27.29	26.65	0.85	74.5	114.2	71.0	46.9	57.1	44.7	1250	40	53	83	65	79	55.2	20	5
RV	27 x 5	5	27	27.37	26.56	0.86	70.3	116.4	63.3	44.3	58.2	39.9	1080	40	53	83	65	79	55.2	20	5
RV	27 x 6	5	27	27.40	26.43	0.87	72.6	116.4	57.1	45.7	58.2	36.0	950	40	53	83	65	79	55.2	20	5
RV	27 x 8	5	27	27.51	26.22	0.88	85.3	118.2	49.6	53.8	59.1	31.2	770	40	53	83	65	79	55.2	20	5
RV	27 x 10	5	27	27.62	26.00	0.89	95.7	117.4	44.5	60.3	58.7	28.0	640	40	53	83	65	79	55.2	20	5
RV	30 x 2	5	30	30.15	29.82	0.77	112.4	129.1	116.2	70.8	64.5	73.2	2130	50	62	92	71	85	64.7	20	6
RV	30 x 4	5	30	30.29	29.65	0.84	96.9	145.4	79.8	61.0	72.7	50.3	1500	50	62	92	71	85	64.7	20	6
RV	30 x 5	5	30	30.37	29.56	0.85	90.7	147.5	70.9	57.2	73.8	44.6	1300	50	62	92	71	85	64.7	20	6
RV	30 x 6	5	30	30.40	29.43	0.86	85.5	148.2	64.1	53.9	74.1	40.4	1150	50	62	92	71	85	64.7	20	6
RV	30 x 8	5	30	30.52	29.22	0.88	80.0	152.3	55.8	50.4	76.2	35.2	940	50	62	92	71	85	64.7	20	6
RV	30 x 10	5	30	30.63	29.01	0.89	88.1	150.6	49.6	55.5	75.3	31.3	790	50	62	92	71	85	64.7	20	6
RV	30 x 15	5	30	30.87	28.44	0.90	91.6	143.2	39.9	57.7	71.6	25.1	560	50	62	92	71	85	64.7	20	6
RV	30 x 20	5	30	31.05	27.81	0.90	106.7	153.8	35.2	67.2	76.9	22.2	440	50	62	92	71	85	64.7	20	6
RV	30 x 30	5	30	31.27	26.41	0.90	49.1	85.5	20.9	31.0	42.8	13.2	295	50	62	58	71	85	64.7	20	6
RV	36 x 2	5	36	36.15	35.83	0.75	107.2	124.1	107.1	67.5	62.1	67.4	2490	65	74	110	70	84	76.7	28	6
RV	36 x 4	5	36	36.28	35.63	0.82	91.9	140.9	73.1	57.9	70.5	46.1	1800	65	74	110	70	84	76.7	28	6
RV	36 x 5	5	36	36.37	35.56	0.84	88.9	147.4	65.5	56.0	73.7	41.2	1580	65	74	110	70	84	76.7	28	6
RV	36 x 6	5	36	36.41	35.44	0.85	83.3	147.8	59.1	52.5	73.9	37.2	1410	65	74	110	70	84	76.7	28	6
RV	36 x 8	5	36	36.54	35.24	0.87	76.9	150.5	50.8	48.5	75.3	32.0	1160	65	74	110	70	84	76.7	28	6
RV	36 x 10	5	36	36.65	35.12	0.88	70.9	149.8	45.0	44.7	74.9	28.3	980	65	74	110	70	84	76.7	28	6
RV	36 x 15	5	36	36.80	34.48	0.89	94.8	151.4	37.4	59.7	75.7	23.6	710	65	74	110	70	84	76.7	28	6
RV	36 x 20	5	36	37.12	33.88	0.90	105.1	155.8	31.6	66.2	77.9	19.9	560	65	74	110	70	84	76.7	28	6

Maximum backlash of single nuts: 0.03mm (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	39 x 2	5	39	39.15	38.82	0.73	181.4	197.0	142.1	114.3	98.5	89.5	2910	80	80	116	90	100	82.7	28	6
RV	39 x 4	5	39	39.29	38.65	0.82	156.8	226.2	97.5	98.8	113.1	61.5	2140	80	80	116	90	100	82.7	28	6
RV	39 x 5	5	39	39.35	38.54	0.84	150.2	235.2	86.4	94.6	117.6	54.5	1890	80	80	116	90	100	82.7	28	6
RV	39 x 6	5	39	39.42	38.44	0.85	142.5	238.4	78.5	89.8	119.2	49.5	1690	80	80	116	90	100	82.7	28	6
RV	39 x 8	5	39	39.54	38.24	0.87	131.9	243.7	67.7	83.1	121.8	42.7	1390	80	80	116	90	100	82.7	28	6
RV	39 x 10	5	39	39.74	38.12	0.88	124.4	247.4	60.5	78.3	123.7	38.1	1190	80	80	116	90	100	82.7	28	6
RV	39 x 15	5	39	39.92	37.49	0.89	137.8	241.1	48.9	86.8	120.5	30.8	860	80	80	116	90	100	82.7	28	6
RV	39 x 20	5	39	40.15	36.90	0.90	143.7	265.5	42.9	90.6	132.8	27.0	680	80	80	116	90	100	82.7	28	6
RV	39 x 25	5	39	40.50	36.80	0.90	142.3	251.7	38.2	89.7	125.9	24.0	550	80	80	116	90	100	82.7	28	6
RV	44 x 6	6	44	44.35	43.54	0.84	122.0	231.2	88.4	76.8	115.6	55.7	2030	100	80	118	80	90	82.7	28	6
RV	44 x 12	6	44	44.65	43.03	0.88	133.8	240.5	61.8	84.3	120.3	39.0	1270	100	80	118	80	90	82.7	28	6
RV	44 x 18	6	44	44.90	42.47	0.89	136.3	236.7	50.5	85.9	118.3	31.8	920	100	80	118	80	90	82.7	28	6
RV	44 x 24	6	44	45.12	41.88	0.90	139.2	229.8	43.9	87.7	114.9	27.6	720	100	80	118	80	90	82.7	28	6
RV	44 x 30	6	44	45.28	41.23	0.90	137.3	237.4	38.9	86.5	118.7	24.5	590	100	80	118	80	90	82.7	28	6
RV	48 x 5	5	48	48.35	47.54	0.82	247.0	383.8	111.6	155.6	191.9	70.3	2580	120	100	150	113	127	103	45	8
RV	48 x 10	5	48	48.67	47.05	0.87	207.6	412.7	77.5	130.8	206.4	48.8	1680	120	100	150	113	127	103	45	8
RV	48 x 15	5	48	48.99	46.53	0.88	219.3	415.7	62.9	138.1	207.9	39.6	1240	120	100	150	113	127	103	45	8
RV	48 x 20	5	48	49.21	45.97	0.89	223.3	473.4	55.9	140.7	236.7	35.2	980	120	100	150	113	127	103	45	8
RV	48 x 25	5	48	49.43	45.38	0.90	240.5	448.4	49.2	151.5	224.2	31.0	810	120	100	150	113	127	103	45	8
RV	48 x 30	5	48	49.62	44.75	0.89	171.7	407.5	43.1	108.1	203.7	27.2	690	120	100	150	113	127	103	45	8
RV	48 x 5	6	48	48.30	47.63	0.82	243.6	418.4	142.0	153.5	209.2	89.5	2600	120	86	122	113	127	88.7	45	6
RV	48 x 6	6	48	48.35	47.54	0.84	236.1	431.7	129.5	148.7	215.8	81.6	2350	120	86	122	113	127	88.7	45	6
RV	48 x 8	6	48	48.46	47.38	0.86	220.7	442.7	111.4	139.0	221.4	70.2	1970	120	86	122	113	127	88.7	45	6
RV	48 x 10	6	48	48.56	47.21	0.87	206.6	443.6	98.3	130.2	221.8	61.9	1700	120	86	122	113	127	88.7	45	6
RV	48 x 12	6	48	48.66	47.04	0.88	217.6	447.9	89.8	137.1	224.0	56.6	1490	120	86	122	113	127	88.7	45	6
RV	48 x 15	6	48	48.79	46.76	0.88	224.2	450.1	80.6	141.3	225.0	50.7	1260	120	86	122	113	127	88.7	45	6
RV	48 x 18	6	48	48.92	46.49	0.89	225.4	438.3	72.7	142.0	219.2	45.8	1090	120	86	122	113	127	88.7	45	6
RV	48 x 20	6	48	49.00	46.30	0.89	226.9	495.7	70.3	143.0	247.9	44.3	1000	120	86	122	113	127	88.7	45	6
RV	48 x 24	6	48	49.15	45.91	0.90	260.4	485.0	64.2	164.1	242.5	40.5	850	120	86	122	113	127	88.7	45	6

Maximum backlash of single nuts: 0.03mm (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	51 x 5	5	51	51.36	50.55	0.81	273.1	420.6	116.2	172.0	210.3	73.2	2930	140	102	147	125	139	105	50	8
RV	51 x 10	5	51	51.74	50.12	0.86	227.0	449.2	79.8	143.0	224.6	50.3	1920	140	102	147	125	139	105	50	8
RV	51 x 15	5	51	51.96	49.53	0.88	244.2	460.6	65.2	153.9	230.3	41.1	1430	140	102	147	125	139	105	50	8
RV	51 x 20	5	51	52.23	48.99	0.89	294.1	505.8	56.5	185.3	252.9	35.6	1140	140	102	147	125	139	105	50	8
RV	51 x 25	5	51	52.46	48.41	0.90	296.1	514.6	52.0	186.5	257.3	32.7	940	140	102	147	125	139	105	50	8
► RV	60 x 15	5	60	60.99	58.55	0.87	497.3	1211.8	97.2						122	166		189
► RV	60 x 20	5	60	61.26	58.02	0.88	444.4	1191.0	184.1						122	166		189
► RV	60 x 25	5	60	61.51	57.46	0.89	402.3	1163.9	75.3						122	166		189
► RV	60 x 30	5	60	61.74	56.87	0.89	367.2	1134.5	69.1						122	166		189
RV	60 x 6	6	60	60.37	59.56	0.82	257.7	474.9	127.0	162.3	237.5	80.0	3190	180	110	150	106	124	113.2	40	8
RV	60 x 10	6	60	60.61	59.27	0.86	231.1	504.7	97.2	145.6	252.3	61.3	2360	180	110	150	106	124	113.2	40	8
RV	60 x 12	6	60	60.67	59.05	0.87	221.3	510.8	88.3	139.4	255.4	55.6	2090	180	110	150	106	124	113.2	40	8
RV	60 x 18	6	60	60.96	58.53	0.88	214.9	507.3	71.2	135.4	253.6	44.8	1550	180	110	150	106	124	113.2	40	8
RV	60 x 20	6	60	61.04	58.34	0.89	265.4	594.7	70.0	167.2	297.4	44.1	1430	180	110	150	106	124	113.2	40	8
RV	60 x 30	6	60	61.43	57.38	0.90	284.5	530.5	54.6	179.2	265.3	34.4	1020	180	110	150	106	124	113.2	40	8
RV	60 x 42	6	60	61.78	56.10	0.90	245.2	500.8	46.4	154.5	250.4	29.3	760	180	110	150	106	124	113.2	40	8
RV	64 x 6	6	64	64.36	63.55	0.81	307.3	558.6	138.5	193.6	279.3	87.2	3430	200	115	180	118	129	118	45	8
RV	64 x 12	6	64	64.68	63.06	0.86	264.7	604.9	96.2	166.8	302.4	60.6	2280	200	115	180	118	129	118	45	8
RV	64 x 18	6	64	64.97	62.54	0.88	238.1	612.3	78.0	150.0	306.1	49.1	1700	200	115	180	118	129	118	45	8
RV	64 x 24	6	64	65.23	61.99	0.89	269.6	682.8	68.2	169.9	341.4	42.9	1360	200	115	180	118	129	118	45	8
RV	64 x 30	6	64	65.46	61.41	0.90	265.3	658.5	60.7	167.1	329.2	38.2	1130	200	115	180	118	129	118	45	8
RV	64 x 36	6	64	65.65	60.79	0.90	276.7	667.3	57.0	174.3	333.7	35.9	960	200	115	180	118	129	118	45	8
RV	70 x 6	6	69	69.36	68.55	0.80	406.6	724.0	160.5						130	172	140	170	133.7	50	10
RV	70 x 12	6	69	69.68	68.06	0.86	347.6	781.9	110.5						130	172	140	170	133.7	50	10
RV	70 x 18	6	69	69.98	67.55	0.88	310.1	786.9	89.0						130	172	140	170	133.7	50	10
RV	70 x 24	6	69	70.25	67.01	0.89	338.1	773.9	76.5						130	172	140	170	133.7	50	10
RV	75 x 5	5	75	75.36	74.55	0.77	568.4	918.0	171.8						150	210	175	191	153	63	10
RV	75 x 10	5	75	75.70	74.08	0.84	525.3	1227.0	121.0						150	210	175	191	153	63	10
RV	75 x 15	5	75	76.01	73.58	0.86	469.6	1261.0	97.9						150	210	175	191	153	63	10
► RV	75 x 15	5	75	76.01	73.58	0.86	643.8	1862.3	115.3						150	195		233
RV	75 x 20	5	75	76.31	73.07	0.88	492.3	1265.0	84.6						150	195	175	191	153	63	10
► RV	75 x 20	5	75	76.31	73.07	0.87	569.8	1812.8	98.7						150	195		233
► RV	75 x 25	5	75	76.58	72.53	0.88	525.3	1798.9	88.5						150	195		233
► RV	75 x 30	5	75	76.83	71.97	0.89	481.1	1754.3	80.6						150	195		233

Maximum backlash of single nuts: 0.03mm for RV 51 and 0.04mm for RV 60 to RV 75 (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading
►: High capacity definition

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type RV - Ground screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RV	80 x 6	6	80	80.37	79.56	0.79	399.8	738.9	154.2						138	180	130	158	141.7	50	10
RV	80 x 8	6	80	80.49	79.41	0.82	375.3	771.9	131.7						138	180	130	158	141.7	50	10
RV	80 x 10	6	80	80.61	79.27	0.84	384.8	942.1	119.3						138	180	130	158	141.7	50	10
RV	80 x 12	6	80	80.74	79.12	0.85	374,0	968.5	109.5						138	180	130	158	141.7	50	10
RV	80 x 18	6	80	81.00	78.56	0.87	394.5	962.3	87.4						138	180	130	158	141.7	50	10
RV	80 x 20	6	80	81.09	78.39	0.88	411.3	954.6	82.4						138	180	130	158	141.7	50	10
RV	80 x 24	6	80	81.28	78.04	0.88	423.1	957.0	75.7						138	180	130	158	141.7	50	10
RV	80 x 30	6	80	81.53	77.48	0.89	426.9	954.6	68.2						138	180	130	158	141.7	50	10
RV	80 x 36	6	80	81.77	76.91	0.89	399.4	860.2	59.0						138	180	130	158	141.7	50	10
RV	92 x 12	6	92	92.69	91.08	0.84	751.0	1791.0	169.8						160	220	210	234	163.7	63	10
RV	92 x 18	6	92	93.01	90.58	0.86	817.0	1844.0	137.2						160	220	210	234	163.7	63	10
RV	92 x 24	6	92	93.30	90.07	0.88	879.0	1850.0	118.0						160	220	210	234	163.7	63	10
RV	100 x 15	5	99	100.04	97.61	0.85	904.0	2581.0	139.9						200	245	260	281	203	63	10
► RV	l00 x 15	5	99	100.04	97.61	0.84	983.3	3533.0	155.5						200	245		304
RV	100 x 20	5	99	100.35	97.11	0.87	829.0	2609.0	119.8						200	245	260	281	203	63	10
► RV	100 x 20	5	99	100.35	97.11	0.86	895.8	3545.0	133.5						200	245		304
RV	100 x 25	5	99	100.65	96.60	0.88	858.0	2646.0	107.6						200	245	260	281	203	63	10
RV	100 x 35	5	99	101.23	95.52	0.89	893.0	2598.0	90.8						200	245	260	281	203	63	10
RV	100 x 18	6	100	101.02	98.60	0.86	751.0	1921.0	124.8						185	260	230	260	188	63	10
RV	100 x 24	6	100	101.32	98.08	0.87	793.0	1891.0	106.0						185	260	230	260	188	63	10
RV	100 x 30	6	100	101.60	97.55	0.88	814.0	1923.0	96.4						185	260	230	260	188	63	10
RV	120 x 15	5	120	12l .00	118.62	0.83	1135.0	3414.0	155.2						240	300	280	300	243	100	10
► RV	120 x 15	5	120	121.00	118.62	0.83	1172.0	4545.0	171.7						240	300		354
RV	120 x 20	5	120	121.37	118.13	0.85	1042.0	3466.0	133.1						240	300	280	300	243	100	10
► RV	120 x 20	5	120	121.37	118.13	0.85	1071.0	4683.0	146.7						240	300		354
RV	120 x 25	5	120	121.68	117.63	0.87	986.0	3535.0	119.1						240	300	280	300	243	100	10
► RV	120 x 25	5	120	121.68	117.63	0.87	1011.0	4764.0	132.0						240	300		354
► RV	120 x 30	5	120	121.98	117.11	0.87	945.0	4726.0	120.4						240	300		354
RV	120 x 18	6	120	121.04	118.61	0.85	778.0	2534.0	138.6						220	260	230	260	223	100	10
RV	120 x 24	6	120	121.30	118.10	0.87	786.0	2537.0	118.4						220	260	230	260	223	100	10
RV	120 x 30	6	120	121.64	117.59	0.88	818.0	2577.0	106.5						220	260	230	260	223	100	10
► RV	135 x 15	5	135	136.06	133.62	0.82	1393.0	6033.0	194.3						280	345		393
► RV	135 x 20	5	135	126.38	133.14	0.84	1284.0	6145.0	167.0						280	345		393
► RV	135 x 25	5	135	136.70	132.65	0.86	1214.0	6264.0	149.8						280	345		393
► RV	135 x 30	5	135	137.00	132.14	0.86	1122.0	6154.0	134.9						280	345		393
► RV	150 x 15	5	150	151.06	148.63	0.81	1536.0	7285.0	210.5						320	385		437
► RV	150 x 20	5	150	151.39	148.15	0.83	1426.0	7481.0	181.9						320	385		437
► RV	150 x 25	5	150	151.71	147.66	0.85	1337.0	7571.0	161.7						320	385		437
► RV	150 x 30	5	150	152.02	147.10	0.86	1263.0	7601.0	147.3						320	385		437

Maximum backlash of single nuts: 0.04mm for RV 80 to RV 92 and 0.05mm for RV 100 to RV 150 (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

T: +44 (0)1386 421005F: +44 (0)1386 422441E: sales@abssac.co.ukW: www.abssac.co.uk

Type BRV - Rolled screws

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
BRV	8 x 5	4	8	8.3	7.45	0.89	4.1	7.5	14,9	2.6	3.7	9.4	170	5	21	41	31	41	22.3	10	3
BRV	12 x 4	5	12	12.25	11.65	0.89	7.0	12.5	23.6	4.4	6.2	14.8	310	8	26	46	31	41	27.3	10	3
BRV	12 x 5	5	12	12.32	11.56	0.89	7.3	12.7	21.5	4.6	6.3	13.5	260	8	26	46	31	41	27.3	10	3
BRV	15 x 4	5	15	15.25	15.65	0.88	11.2	19.3	28.2	7.0	9.6	17.7	370	10	34	56	35	51	35.7	14	4
BRV	15 x 5	5	15	15.32	15.56	0.89	10.5	19.5	25.4	6.6	9.7	16.0	310	10	34	56	35	51	35.7	14	4
BRV	20 x 5	5	19.5	19.83	19.02	0.88	25.9	44.8	38.7	16.3	22.3	24.4	590	20	42	64	55	65	43.7	20	4
BRV	20 x 10	5	19.5	20.04	18.62	0.89	20.0	43.3	34.7	12.6	21.7	21.9	340	20	42	64	55	65	43.7	20	4
BRV	23 x 4	5	22.5	22.79	22.15	0.86	32.3	51.5	45.1	20.3	25.7	28.4	1000	30	45	67	55	65	46.7	20	4
BRV	23 x 5	5	22.5	22.87	22.06	0.87	29.9	51.5	39.8	18.8	25.7	25.1	860	30	45	67	55	65	46.7	20	4
BRV	23 x 10	5	22.5	23.12	21.62	0.89	23.5	50.7	28.0	14.7	25.3	17.7	500	30	45	67	55	65	46.7	20	4
BRV	27 x 5	5	27	27.37	26.56	0.86	49.2	81.5	49.9	30.9	40.7	31.5	1080	40	53	83	65	79	55.2	20	5
BRV	27 x 10	5	27	27.62	26.00	0.89	67.0	82.2	35.1	42.22	41.0	22.1	640	40	53	83	65	79	55.2	20	5
BRV	30 x 10	5	30	30.63	29.01	0.89	61.7	105.4	39.1	38.8	52.7	24.6	790	50	62	92	71	85	64.7	20	6
BRV	39 x 10	5	39	39.74	38.12	0.88	87.1	173.2	47.7	54.8	86.5	30.1	1190	80	80	116	90	100	82.7	28	6
BRV	39 x 25	5	39	40.50	36.80	0.90	99.6	176.2	30.1	62.7	88.1	19.0	550	80	80	116	90	100	82.7	28	6
BRV	44 x 30	6	44	45.28	41.23	0.90	96. 1	166.2	38.9	60.5	83.0	24.5	590	100	80	118	80	90	82.7	28	6

Maximum backlash of single nuts: 0.03mm for BRV 8 and 0.04mm for BRV 12 and BRV 44 (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

Terms used in tables

P: - Lead
D: - Reference diameter
N: - Number of starts
d0: - Nominal diameter

dl: - External diameter
d2: - Thread bottom diameter
C: - Dynamic load capadty
Co: - Static load capacity

F_k: - Rigidity factor
F_v: - Preloading force
M_v: - Load-free torque due to preloading

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Type RVR - Ground screws - System with rollers' recycling

						Efficiency	Single nut, with backlash and double nut			Split nut, preloaded, without backlash			Split nuts, preloaded, preloading torque				Without wipers	With wipers
			[mm]	[mm]	[mm]		[kN]	[kN]	[N^2/3/μm]	[kN]	[kN]	[N^2/3/μm]	[N]	[Ncm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]
Type	D X P	N	d0	d1	d2		C	Co	F_k	C	Co	F_k	Fv	Mv	D1	D2	L1	L1	L2	L3	L4
RVR	8 x 0.25	1	7.80	8.00	7.69	0.66	12.5	12.1	47.9	7.9	6.1	30.2	1250	6	19	42	31	41	19.8	10	2
RVR	8 x 0.5	1	7.80	8.00	7.58	0.77	10.2	12.8	33.3	6.4	6.4	21.0	1000	6	19	42	31	41	19.8	10	2
RVR	8 x 1	1	7.63	8.00	7.19	0.84	8.0	12.1	23.3	5.1	6.0	14.7	730	6	20	43	31	41	20.8	12	2
RVR	8 x 2	2	7.63	8.00	7.19	0.88	8.0	12.1	23.3	5.1	6.0	14.7	460	6	20	43	31	41	20.8	12	2
RVR	10 x 0.5	1	9.63	10.00	9.41	0.74	11.3	15.1	35.7	7.1	7.5	22.5	1200	8	22	43	31	41	22.8	12	2
RVR	10 x 1	1	9.63	10.00	9.19	0.82	8.9	14.4	25.0	5.6	7.2	15.8	880	8	22	43	31	41	22.8	12	2
RVR	10 x 2	2	9.63	10.00	9.19	0.87	8.9	14.4	25.0	5.6	7.2	15.8	570	8	22	43	31	41	22.8	12	2
RVR	12 x 0.5	1	11.98	12.00	11.58	0.71	10.5	13.6	32.3	6.6	6.8	20.4	1300	10	24	46	31	41	25.3	10	3
RVR	12 x 1	1	11.63	12.00	11.19	0.80	10.1	17.4	27.4	6.3	8.7	17.2	1000	10	24	46	31	41	25.3	10	3
RVR	12 x 2	2	11.63	12.00	11.19	0.86	10.1	17.3	27.4	6.3	8.7	17.2	670	10	24	46	31	41	25.3	10	3
RVR	16 x 0.5	1	15.66	16.03	15.22	0.77	11.7	21.7	29.9	7.3	10.9	18.8	1270	15	29	53	31	41	32.7	14	4
RVR	16 x 1	1	16.00	16.37	15.56	0.77	11.1	21.0	29.6	7.0	10.5	18.7	1250	15	29	53	31	41	32.7	14	4
RVR	16 x 2	2	16.00	16.37	15.56	0.84	11.1	21.0	29.6	7.0	10.5	18.7	890	15	29	53	31	41	32.7	14	4
RVR	20 x 0.5	1	19.36	19.55	19.14	0.61	24.8	37.9	57.0	15.7	18.9	35.9	1800	20	34	56	37	47	35.7	14	4
RVR	20 x 1	1	19.63	20.00	19.19	0.74	17.6	36.1	41.2	11.1	18.1	25.9	1470	20	34	56	37	47	35.7	14	4
RVR	20 x 2	2	19.63	20.00	19.19	0.82	17.6	36.1	41.2	11.1	18.1	25.9	1080	20	34	56	37	47	35.7	14	4
RVR	25 x 1	1	25.00	25.37	24.56	0.70	30.4	70.0	53.6	19.2	35.0	33.8	1870	30	42	67	44	54	43.7	14	4
RVR	25 x 2	2	25.00	25.37	24.56	0.80	30.4	70.0	53.6	19.2	35.0	33.8	1440	30	42	67	44	54	43.7	14	4
RVR	32 x 1	1	32.00	32.37	31.56	0.65	65.1	121.3	67.0	41.0	60.7	42.2	2600	50	53	83	55	67	55.2	20	5
RVR	32 x 2	2	32.00	32.37	31.56	0.77	65.1	121.3	67.0	41.0	60.6	42.2	2080	50	53	83	55	67	55.2	20	5
RVR	40 x 1	1	39.63	40.00	39.19	0.61	83.5	180.7	78.3	52.6	90.3	49.3	3090	70	70	104	66	80	72.7	28	6
RVR	40 x 2	2	39.63	40.00	39.19	0.74	83.5	180.7	78.3	52.6	90.3	49.3	2550	70	70	104	66	80	72.7	28	6
RVR	50 x 1	1	49.63	50.00	49.19	0.56	161.8	326.1	101.3	102.0	163.0	63.8	3320	90	82	124	80	94	84.7	28	6
RVR	50 x 2	2	49.63	50.00	49.19	0.70	161.8	326.1	101.3	101.9	163.0	63.8	2820	90	82	124	80	94	84.7	28	6
RVR	50 x 3	2	49.45	50.00	48.79	0.76	142.7	331.1	81.8	89.9	165.6	51.5	2460	90	82	124	80	94	84.7	28	6
RVR	50 x 4	2	49.26	50.00	48.38	0.80	132.4	333.9	71.0	83.4	167.0	44.8	2180	90	82	124	80	94	84.7	28	6
RVR	63 x 2	1	62.26	63.00	61.38	0.66	197.8	486.2	79.5	124.6	243.1	50.1	3190	120	105	148	110	124	105.2	40	8
RVR	63 x 3	1	62.00	63.00	60.68	0.73	170.2	470.1	63.5	107.2	235.1	40.0	2840	120	105	148	110	124	105.2	40	8
RVR	63 x 4	2	62.26	63.00	61.38	0.77	197.8	486.1	79.5	124.6	243.0	50.1	2540	120	105	148	110	124	105.2	40	8
RVR	80 x 2	1	79.26	80.00	78.38	0.61	360.7	835.6	121.0						138	195	175	189	141.7	50	10
RVR	80 x 3	1	79.00	80.00	77.68	0.69	320.7	844.2	98.2						138	195	175	189	141.7	50	10
RVR	80 x 4	2	78.52	80.00	76.76	0.74	360.9	834.4	121.0						138	195	175	189	141.7	50	10
RVR	100 x 3	1	98.89	100.00	97.57	0.65	492.0	1276	101.1						170	230	180	196	173 7	56	12
RVR	100 x 4	1	98.52	100.00	96.76	0.70	447.7	1258	87.1						170	230	180	196	173.7	56	12
RVR	100 x 5	1	98.15	100.00	95.95	0.74	485.6	1431	86.1						170	230	195	215	173.7	56	12
RVR	125 x 5	1	123.15	125.00	120.95	0.70	856	3102	126.2						220	260	262	282	223	100	12

Maximum backlash of single nuts: 0.03mm for RVR 8 to RVR 40 and 0.04mm for RVR 50 to RVR 125 (can be less on request).
If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).

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BALL SCREW APPLICATION DATA FORM (PART 1)

Name		Company
Address

Tel	Fax		E-Mail
OPERATING LOADS
Normal operating loadKilo/lbs
Load is in tension	Load is in compression		Load is in both
Load is constant	Load is variable
(If load is variable submit load curve diagram.)
Maximum static load in tensionKilo/lbs
Maximum static load in compressionKilo/lbs
Sideloads if any		Overturning moment (cantilever loads)
Describe

DUTY CYCLE
Continuous operation	Intermittent operation		Variable
Time under dynamic load		Time at rest
Describe operation

METHOD OF OPERATION
Screw will be driven		Nut will be driven
The force will be applied to the nut to rotate the screw (back driven screw)
Assembly will be lubricated		Type of lube
Please ask our technical staff for recommendations for the best lubricant for your application.
SPEED AND TRAVEL RATE
Rate of travel described in inches per minute
Input RPM at screw or nut
Amount of torque available

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BALL SCREW APPLICATION DATA FORM (PART 2)

TRAVEL LENGTH AND SUPPORTS
What is the unsupported screw length between bearingsin/mm
Does the nut travel the full length of the screwin/mm
If not, over what area does the nut travel
Is the screw operated in a vertical	Horizontal	Other, please state
What type of end supports are you using?
LEAD ACCURACY
Standard accuracy (.015 in per ft max) / 0.3mm per 300mm)
Precision rolled thread accuracy required (0.003 in per ft) / (.07mm per 300mm)
Ground precision accuracy required (.0005 in per ft) / (.01mm per 300mm)
Better than the above required? Please state 0.0mm / 300mm
SCREW SIZE
Standard backlash OK (up to .007in) / (.1778mm)
Reduced backlash required (.002 in max) / (.0508mm)
Zero backlash required
ENVIRONMENT
Will operate at normal room temperature		Will operate in very dirty / dusty conditions
Will operate at very high temperatures		Will operate where metal chips are present
Will operate at very low temperatures		Will operate in corrosive atmosphere
STRAIGHTNESS
Standard straightness OK (.01in per ft) 0.254mm / 300mm
Special straightness required (.002in per ft) 0.0508mm / 300mm
Straightness better than 0.002in per ft required 0.0508mm / 300mm
END MACHINING
If you want to order the screws with the ends already machined to your specifications, submit a sketch or drawing with details and tolerances required.
QUOTATION INFORMATION
Quantity desired
Delivery schedule

Please submit any additional data you feel would be helpful to us in selecting the proper screw size and in submitting your quotation. Attach drawings of screw and nut if available. Suggestions, help and advice is given in good faith but without responsibility. It remains the responsibility of the customer or end user to ensure that the product chosen meets their life, duty cycle and other performance criteria.

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Applications

The great flexibility of ABSSAC means it can make all types of screws and nuts as shown in the examples below:

Applications Photo 1

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Applications Photo 2

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COPYRIGHT

"ABSSAC" is a registered trade mark 2375859

All rights are reserved.

The use of this catalogue is made available to you by Abssac Limited. The exclusive right to control the use of the copyright and trademarks on this site is controlled by Abssac Limited. These may not be copied, reproduced, published, distributed, modified or otherwise used in any form including electronic copying without the express permission of Abssac Limited. Abssac Limited has made all reasonable endeavor to ensure that the material on this site is accurate. You agree that Abssac Limited, nor any other person involved in creating or providing this catalogue shall be liable for any indirect or consequential damage arising from the use of any information contained in this catalogue.

The information contained in this catalogue is provided 'as is' without warranty of any kind, either expressed or implied. Abssac Limited assumes no responsibility for errors or omissions in this catalogue or other documents which are reference by or linked to this catalogue. This catalogue could include technical or other inaccuracies including typographical errors. Updates and changes are periodically added to the information herein; these changes will be incorporated in new editions of this catalogue. Abssac Limited may make improvements and/or changes in the product(s) or service(s) described in this publication at any time. You agree that the above terms represent the entire basis of the agreement between us, upon which you are permitted to enter this site and you agree that all relations between us are subject to the Law of England and Wales.

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STANDARD CONDITIONS OF SALE

1.: Interpretation
1.1: In these Conditions:; "Buyer" means the person who accepts a quotation of the Seller for the sale of the Goods or whose order for the Goods is accepted by the Seller; "Goods" means the goods (including any instalment of the goods or any parts for them) which the Seller is to supply in accordance with these Conditions; "Seller" means ABSSAC LIMITED a company incorporated in England and whose registered number is 1677177.; "Conditions" means the standard terms and conditions of sale set out in this document and (unless the context otherwise requires) includes any special terms and conditions agreed in writing between the Buyer and the Seller; "Contract" means the Contract for the purchase and sale of the Goods; "Writing" includes telex, cable, facsimile transmission, E-Mail and comparable means of communication
1.2: Any reference in these Conditions to any provision of a statute shall be construed as a reference to that provision as amended, re-enacted or extended at the relevant time
1.3: The headings in these Conditions are for convenience only and shall not affect their interpretation
2.: Basis of the sale
2.1: Subject to Condition 3 below, the Seller shall sell and the Buyer shall purchase the Goods in accordance with any oral or written order of the Buyer which is accepted by the Seller, or any written quotation of the Seller which is accepted by the Buyer, subject to these Conditions which shall govern the Contract to the exclusion of any other terms and conditions subject to which any such quotation is accepted or purported to be accepted, or any such order is made or purported to be made, by the Buyer
2.2: No variation, addition or waiver of any of these Conditions shall be effective unless it is in Writing and signed by a duly authorised representative of both the Seller and the Buyer
2.3: The Seller's employees or agents are not authorised to make any representations concerning the Goods unless confirmed by the Seller in Writing. In entering into the Contract the Buyer acknowledges that it does not rely on any such representations which are not so confirmed
2.4: Samples supplied and advice or recommendations as to storage, application or use of the Goods given by the Seller or its employees or agents to the Buyer or its employees or agents are for guidance only and any such matter which is not confirmed in Writing by the Seller is followed or acted upon entirely at the Buyer's own risk and accordingly the Seller shall not be liable for any such advice or recommendation which is not so confirmed then the Buyer should depend on their accuracy only after obtaining specific written confirmation to that effect from the Seller
2.5: Any typographical, clerical or other error or omission in any sales literature, quotation, price list, acceptance of offer, invoice or other document or information issued by the Seller shall be subject to correction without any liability on the part of the Seller
3.: Quotations and acceptance of orders
3.1: Quotations issued by the Seller are invitations to order Goods from the Seller. No Contract will exist until the Seller has accepted the Buyer's order in accordance with condition 3.3.
3.2: Subject to condition 3.1 the price in the quotation should be valid for a period of 30 days from the date of the quotation unless otherwise advised by the Seller in Writing
3.3: The Seller shall not be bound by any order submitted by the Buyer unless and until confirmed by the Seller in Writing
3.4: Scheduled call off purchase orders made by the Buyer with the Seller are for twelve month periods only, or until 19th December ofthat year, depending which comes first unless otherwise agreed in Writing by the Seller
3.5: The Buyer is committed to purchasing any remaining amount of products on his purchase order if the Buyer decides to cancel the order mid schedule unless otherwise agreed in Writing by the Seller

3.6: No order which has been accepted by the Seller may be cancelled by the Buyer except with the agreement in Writing of the Seller on the terms that the Buyer shall indemnify the Seller in full against all loss (including loss of profit), costs (including the costs of all labour and materials used), damages, charges and expenses incurred by the Seller as a result of cancellation.
3.7: Compliance with United States Export Regulations
4.: Specifications
4.1: The Buyer shall be responsible to the Seller for ensuring the accuracy of the terms of any order (including any applicable specification) submitted by the Buyer, and for giving the Seller any necessary information relating to the Goods within a sufficient time to enable the Seller to perform the Contract in accordance with its terms
4.2: The quantity, quality and description of any specification for the Goods shall be those set out in the Seller's quotation (if accepted by the Buyer) or the Buyer's order (if accepted by the Seller)
4.3: If Goods are supplied in accordance with the Buyer's specifications the Buyer shall be solely responsible for the specifications and ensuring that they are accurate
4.4: If any technical calculations are made by the Seller using information supplied by the Buyer the Buyer accepts that they are responsible for supplying accurate technical information and accordingly the Seller is not liable in respect of calculations based on incorrect information given
4.5: If Goods are to be manufactured or any process is to be applied to the Goods by the Seller in accordance with a specification or request submitted by the Buyer or should any change be made to the Goods at the request of the Buyer the Buyer shall indemnify the Seller against all loss damages costs and expenses awarded against or incurred by the Seller in connection with or paid or agreed to be paid by the Seller in settlement of any claims for infringement of any patent, copy right, design, trade mark or other industrial or intellectual property rights of any person which results from the Seller's use of the Buyers specification

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4.6: The Seller reserves the rights to make any changes in the specification of the Goods which are required to conform with any applicable statutory or EC requirements or, where the Goods are to be supplied to the Seller's specification, which do not materially affect their quality or performance
4.7: At all times the buyer has the responsibility to adequately guard and maintain the product supplied in accordance with relevant operation manuals, service factors and health and safety legislation applicable for any product supplied by ABSSAC Limited.
4.8: The seller (Abssac Limited) shall not in any event be liable for any consequential damages, secondary charges, expenses for installing or disconnecting, or losses or injuries to persons or property resulting from any alleged defect in the product or any use of the product, and lor in manner that exceeds its design, duty cycle and or ability.
4.9: It remains the responsibility of the buyer to test any samples or other products that the seller will provide for fatigue, stress and general ability in the application. All products that the seller provides and are used in both real and test situations are considered by Abssac Ltd to have been thoroughly tested to meet and exceed the anticipated life and duty requirement of the product in its application by the buyer. It remains the responsibility of the buyerto give all technical information to the seller and all buyers are responsible for meeting health and safety measures and adequately guarding users and all associated parties against all and any possible failures in line with the health and safety requirements.; Other Where recommended guidelines of serviceable or replaceable parts and maintenance/inspection requirements are exceeded or ignored by the user and/or buyer, no warranty or other claim can or will exist. Where minimum or maximum values/sizes/limits/dimensions/fitting instructions and technical data of parts are ignored/abused/extended/not applied/not actioned or used in excess ofthe design or standard parameters ofthe product by the user and/or buyer then no warranty claim or other claim can exist.; No warranty or other claim can exist or be made by the user or buyer or other to the seller or its agent or other for any part used in motor sport, military or aviation. No warranty is given to this type of application.; All or any secondary or further processes/disassembly/machining/ heating/drying/coating or any other additional process the originally supplied product or associated part/product after dispatch from the seller or its agent voids any warranty claim or other claim.; It remains the responsibility of the buyer or user to advise us the seller of any and all certification/test/traceable certification requirement.; Conversations may be recorded as part of our ongoing customer service program.
5.: Packaging
5.1: Packaging for the Goods shall be at the discretion of the Seller which has the right to pack the Goods in such a manner and with such materials and in such quantities as in his absolute discretion thinks fit unless detailed packaging instructions are received from the Buyer prior to agreeing a price for the Goods which the Seller agrees to in Writing
6.: Price of the Goods
6.1: Price of the Goods shall be the Seller's quoted price or, where no price has been quoted (or a quoted price is no longer valid) the price listed in the Seller's published price list current at the date of acceptance of this order. Where the Goods are supplied for export from the United Kingdom, the Seller's published export price list shall apply. All prices quoted are valid for 30 days only or until earlier acceptance by the Buyer, after which time they may be altered by the Seller without given giving written notice to the Buyer
6.2: The price is exclusive of any applicable value added tax, which the Buyer shall be additionally liable to pay to the Seller

6.3: All prices stated shall be subject to variation at the sole discretion of the Seller at any time without prior notice and the Seller shall notify the Buyer of any variation before delivery of the Goods
7.: Payment
7.1: Liability for payment for the Goods supplied to customers who have a trading account with the Seller shall arise on delivery and payment in cash is due 30 days from the date of the invoice or as otherwise specifically agreed in Writing by the Seller. Payment shall be due and the company shall be entitled to sue for the price whether or not property in the Goods has passed by virtue of condition 10 and not withstanding the delivery may not have taken place as a result of the Buyer's wrongful or refusal to accept delivery. The time of payment of the price shall be of the essence of the Contract
7.2: Liability for payment forthe Goods supplied on a proforma invoice basis for customers who do not have a trading account with the Seller shall be prior to delivery of the Goods. The ti me of payment of the price shall be of the essence of the Contract. It is the Buyer's responsibility to give written notice to the Seller of any payment under proforma invoice arrangements
7.3: Sums paid after the due date shall pay interest until the day payment is received at the rate of 5% per annum above the base rate from time to time of National Westminster Bank Pic occurring from day to day from the date of delivery until the date of payment in full
7.4: If the recovery of sums outstanding from the Buyer is passed to a debt collection agency the Buyer shall pay the Seller's costs in instructing the said debt collection agency and all ancillary legal costs
7.5: Without prejudice to any other rights or remedies ofthe Seller any in default of the Buyer in making payment on the due date shall entitle the Seller to suspend deliveries under the Contract or any other Contract so long as the default continues and break the Contract as repudiated by the Buyer and determined if the Buyer has not within 14 days of receiving written notice from the Seller paid all sums due to the Seller.
8.: Delivery
8.1: Delivery shall take place when the Goods are unloaded at or delivered to the Buyer's premises or other delivery location agreed between the Seller and the Buyer exceptthat if the Buyer collects or arranges collection of the Goods from the Seller's premises, or nominates a carrier for the Goods delivery shall take place when the Goods are loaded on the collection or carriers vehicle
8.2: Any dates quoted for delivery of the Goods are approximate only and the Seller will not be liable for any delay in delivery of the Goods however so caused. Time for delivery shall not be of the essence of the Contract unless previously agreed by the Seller in Writing. The Goods may be delivered by the Seller in advance of the quoted delivery date upon giving responsible notice to the Buyer
8.3: The Buyer shall accept immediate delivery or arrange to collect the Goods or arrange suitable storage, failing which the company may either:
8.3.1: effect delivery by whatever means they think most appropriate; or
8.3.2: arrange storage atthe Buyer's risk and expense pending delivery; or
8.3.3: re-sell or otherwise dispose ofthe Goods without prejudice to any other rights the Seller may have against the Buyer for breach of Contract or otherwise
8.4: Where the agreement provides for delivery by instalments each delivery shall constitute a separate Contract and failure by the Seller to deliver any one or more of the instalments in accordance with these Conditions or any claim by the Buyer in respect of any one or more instalments shall not entitle the Buyer to treat the Contract as a whole as repudiated
8.5: The Buyershall not be entitled to reject the Goods by reason only of short delivery

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8.6: The quantity of the Goods delivered under the Contract shall be recorded by the Seller upon dispatch from the Seller's factory or warehouse and the Seller's records shall be accepted by the Buyer as conclusive evidence of the quantity delivered.
8.7: It is the Buyer's responsibilityto notify the seller if Goods have not been received by the Buyer within seven days of the date of receipt of the Seller's invoice, therefore, if no notification is made the Buyer shall be deemed to have received the Goods.
8.8: If the Seller fails to deliver the Goods (or any instalment) for any reason other then any cause beyond the Seller's reasonable control or the Buyer's fault, and the Seller is accordingly liable to the Buyer, the Seller's liability shall be limited to the excess (if any) of the cost to the Buyer (in the cheapest available market) of similar Goods to replace those not delivered over the price of the Goods. The seller is under no obligation or liability in respect of failure to complete or delay or failure to deliver the goods comprised in any order or contract caused directly or indirectly by act of war or terrorism, strikes, lockouts, labour troubles, breakdowns, delays in transport, accidents, delay in obtaining material, fire, government prohibition, delivery of necessary fuel requirements, any and all problems or other restrictions relating to design or other manufacturing difficulties that arise during an order.
8.9: If the Buyer fails to take delivery of the Goods or fails to give the Seller adequate delivery instructions at the time stated for delivery (otherwise than by reason of any cause beyond the Buyer's reasonable control or by reason of the Seller's fault) then, with out prejudice to any other right or remedy available to the Seller, the Seller may:
8.9.1: store the Goods until actual delivery and charge the Buyer for the reasonable costs (including insurance) of storage;; or
8.9.2: sell the Goods at the best price readily obtainable and (after deducting all reasonable storage and selling expenses) account to the Buyer for the excess over the price under the Contract or charge the Buyer for any shortfall below the price under the Contract
9.: Examinations and claims
9.1: The Buyer shall upon delivery examine the Goods and shall promptly (but in any event within seven working days of delivery) notify in Writing the Seller and the carrier, where relevant, of any apparent damage defect or shortage.
9.2: The Buyer shall comply with the carriers rules, regulations and requirements so as, when appropriate, to the Seller to make a claim against the carrier in respect of any damage or loss in transit.
9.3: Claims in respect of damage defects or shortage not apparent on examination and under clause 9.1 must be notified in Writing to the Seller within 7 days of the date of delivery
9.4: Notification under clauses 9.1 to 9.3 above shall be first made by telephone then by notice in Writing delivered by facsimile transmission or by first class recorded delivery mail and addressed to Abssac Limited Units 19/20 Bond Industrial Estate Wickhamford Evesham Worcs WRll 7RH.
9.5: In default of such notification the seller shall be deemed conclusively to have properly preformed its obligations under the Contract.
10.: Property and risk
10.1: All risk including that of dam age to or loss of the Goods shall pass to the Buyer:
10.1.1: at the time when the Seller notifies the Buyer that the Goods are available for collection the case of Goods to be supplied at the Seller's premises; or
10.1.2: at the time of delivery but prior to unloading or if the Buyer wrongfully fails to take delivery of the Goods at the time when the Seller has tendered to delivery of the Goods in the case of Goods to be supplied otherwise than at the Seller's premises; or;
10.1.3: at the time of delivery of the Goods to a carrier for delivery to the Buyer in the case of Goods to be supplied in a manner otherwise than as set out in Conditions 10.1.1 or 10.1.2 above

10.2: The Buyer shall fully insure the Goods against all risks from the times stipulated forthe passing of risk in condition 10.1 above up to the time when the proprietary rights in such Goods pass to the Buyer
10.3: Property (both legal and beneficial) in the Goods shall remain in the company until all sums owing to the Seller whether under the Contract or any other Contract at any time between the Seller and the Buyer made prior to the date of the Contract ("the Indebtedness) shall have been paid in full, until such time the Buyer shall hold the Goods as bailee for the Seller
10.4: The Buyer shall not be entitled to pledge or in any way charge by way of security for any indebtedness any of the Goods which remain the property of the Seller, but if the Buyer does so all moneys owing by the Buyer to the Seller shall (without prejudice to any other right or remedy of the Seller) forthwith become due and payable
10.5: The Buyer until otherwise notified by the Seller or on the happening of any of the event specified in Condition 10.7 ("the Events") may in the ordinary course of business sell the Goods and pass property in them ("the Re-Sale") subject to the stipulations ("the Stipulations") imposed in Condition 1 0.5
10.6: The Stipulations are that until the Indebtedness has been fully discharged;
10.6.1: the Goods shall not be converted into any other product or mixed with any other Goods to make another product ("the New Product") nor will the Buyer sell the New Product and property in it ("the Sale") but if the Buyer in breach of the above provision does convert or mix the Goods property in the New Product shall atthe earliest moment that such vesting is possible, vest and remain in the Seller whether or not property in the Goods is at the moment extinguished
10.6.2: the Re-Sale shall be for the account of the Seller and, unless the Seller by written notice requires the paymentto it of the proceeds ofthe Re-Sale ("the Proceeds") to the extent of the Indebtedness, in which case the Buyer shall forthwith on receipt of such notice or as soon as thereafter as it shall receive the Proceeds makes its payment, the Buyer shall retain the Proceeds in a separate bank accountto the order of the Seller and not mix them with any other monies
10.6.3: in the event of a breach by the Buyer of its obligations under additions 10.6.1 the Seller shall have the right to trace the Proceeds in to any other moneys which may have been mixed and the Buyer shall indemnify the Seller on a full indemnity basis against loss, damage, costs or expenses incurred in such tracing
10.6.4: until the Re-Sale the Seller has have the right to repossess the Goods or take possession of the New Product at any time and for this purpose shall have the right to enter on to any premises or land in the ownership or possession of the Buyer and remove the Goods and/or the New Product not withstanding that they are affixed to such premises or land and the Buyer shall indemnifythe Seller on a full indemnity basis against all loss, damage, costs or expenses so arising including loss, damage, costs or expenses in respect of third party claims. Such taking of possession re delivery shall be without prejudice in the obligation of the Buyer to purchase Goods
10.6.5: the Goods and the New Product shall until their Re-Sale or Sale be stored separately, protected and insured and identified and clearly marked as the Seller's property
10.7: The Events are;
10.7.1: The giving of any notice to the Buyer that a receiver, manager, administrative receiver, supervisor, nominee or administrator is to be or has been appointed over any of the property or assets of the Buyer or that a petition to wind up the Buyer is to be or has been presented or that an application for an administration order is to be or has been made or any notice of a resolution to wind up the Buyer (say for the purposes of bona fide reconstruction or amalgamation)
10.7.2: A decision by the Buyer that the Buyer intends to make any arrangement or composition with its creditors generally.
10.7.3: Where the Buyer pursuant to section 123 or 268 of the Insolvency Act 1986 appears to be unable to pay a debt or appears to have no reasonable prospects of being able to pay a debt

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10.7.4: any distress or execution levied as threatened to be levied on any property or assets of the Buyer
10.7.5: the inability of the Buyer to pay its debts as they fall due
10.7.6: on receipt of notification from the company under Condition 10.5 or on the happening of any of the Events the Buyer shall immediately deliver the Goods and the New Product property in which the Product is reserved to or is vested in the Seller to such address as the Seller shall specify in default of which or in the alternative, the Seller shall have the right to enter on any premises or land in the ownership or possession of the Buyer in order to recover the Goods and the New Product and the Buyer shall indemnify the Seller on a full indemnity basis against all loss, damage, costs or expenses as arising including loss, damage, cost or expenses in respect of third party claims
11.: Breach by or insolvency by the Buyer
11.1: if the Buyer shall not comply with any of its obligations to the Seller or upon the occurrence of any of the Events referred to in clause 10.7 the Seller shall have the right forthwith to terminate the Contract but without affecting any other claim right or remedy of the Seller against the Buyer and without any liabilityto the Buyer, and if the Goods have been delivered but not paid for the price shall become immediately due and payable notwithstanding any previous agreement or arrangement to the contrary
12.: Export Terms
12.1: In these Conditions "Incoterms" mean the international rules for the interpretation of trade terms of the International Chambers of Commerce as in force at the date when the Contract is made. Unless the Context otherwise requires, any term or expression which is defined in or given a particular meaning my the provisions Incoterms shall have the same meaning in these Conditions, but if there is any conflict between the provisions of Incoterms and these Conditions, the latter shall prevail
12.2: Where the Goods are supplied for export from the United Kingdom, the provisions of this clause 12 shall (subject to any special terms agreed in Writing between the Buyer and the Seller) apply not withstanding any other provision of these Conditions
12.3: The Buyer shall be responsible for complying with any legislation or regulations governing the importation of the Goods in to the country or destination and forthe payment of any duties on them
12.4: Unless otherwise agreed in Writing between the Buyer and the Seller, the Goods shall be delivered fob the air or sea port of shipment and the Sellers shall be under no obligation to give notice under section 32(3) of the Sale Of Goods Act 1979
12.5: The Buyer shall be responsible for arranging for testing and inspection of the Goods at the Sellers premises before shipment. The Seller shall have no liability for any claim in respect of any defect in the Goods which would be apparent on inspection and which is made after shipment, or in respect of any damage during transit
12.6: Payment of all amounts due to the Seller shall be made by irrevocable letter of credit opened by the Buyer in favour of the Seller and confirmed by a bank acceptable by the Seller, or by telegraphic transfer in to the Sellers aforementioned bank account or if the Seller agrees in Writing on or before acceptance of the Buyer order to waive this requirement, by acceptance by the Buyer and delivery to the Seller of a bill of exchange drawn on the Buyer payable 60 days after sight of the order to the Seller at such branch of National Westminster Bank in England as may be specified in the bill of exchange
12.7: Unless otherwise specifically agreed between the Seller and the Buyer all Exports sales shall be made by delivery to the Buyer's premises and the Seller's prices shall be increased to cover the Seller's costs in making such deliveries
12.8: The Buyer warrants that if an import licence or permit is required for the importation of the Goods into the county or destination then such import licence or permit has been obtained or would be obtain prior to shipment

13.: Cancelation, suspension and termination
13.1: If the Buyer shall purport to cancel the whole or any part of the Contract the Seller may by notice in Writing to the Buyer elect to treat the Contract as repudiated and the Buyers shall thereupon be liable to pay the Seller by way of liquidated damages a sum equal to all the expenses incurred by the Seller in connection with the Contract including an appropriate amount in respect of administration overheads, costs and loss of profit. The Sellers reasonable estimate of the expenses incurred shall be final and binding on the parties
13.2: If for any cause whatsoever beyond its control the Seller is unable to make any delivery on the applicable delivery date or preform any of its obligations under the Contract the Seller may be notice in Writing to the Seller terminate the Contract or suspend the Contract without liability of any loss or damage thereby occurred by the Buyer
14.: Intellectual property
14.1: The Buyer shall not infringe any patent, trade name, registered design, copyright industrial or other intellectual property right belonging to the Seller in relation to the Goods or any other goods or matters supplied by the Seller with or in relation to the Goods
14.2: The Buyer shall promptly reportto the Seller particulars of any use by any person of a patent, trade name, registered design, trade mark or get up of Goods which might amountto infringement of any patent, trade mark, registered design, copy right, industrial or other intellectual property right attaching to the Goods or to unfair competition on passing off
14.3: In the event that it comes to the notice of the Buyer that any person alleges that a patent, trade name, registered design, copy right, industrial or other intellectual property right is invalid or that they infringe any rights of that person or that they are open to any form of attach the Buyer shall not make any omissions but shall promptly report the matter to the Seller
14.4: The Seller shall have conduct of all proceedings relating to any patent, trade name, registered design, copy right, industrial or other intellectual property right attaching to the Goods
15.: Force majeure
15.1: In so far as the performance of the Contract by the Seller may be affected by any strike, any lack of available, shipping or transport or materials, any restriction regulation or decree by any local or municipal authority or government department or by any cause beyond the Seller's reasonable control (which shall be construed without reference to the proceeding causes) the Seller may elect at its absolute discretion either;
15.1.1: to terminate the Contract or;
15.1.2: to proceed to preform or continue performance under the Contract within a reasonable time after the termination of such events of circumstance
15.2: In the event that the Seller makes an election under clause 15.1 the Buyer shall accept the Goods or such part of them as are delivered to it not withstanding any delay
16.: Exclusion of Contract (rights of the third party) Act 1999
16.1: Nothing in these Conditions will confer on any third party any benefit or the right to enforce any terms of these Conditions
17.: Proper law
17.1: The Contract is and shall be deemed to be made in England and shall in all respects be governed by English Law and shall be subject to the non-exclusive jurisdiction of the English Court
18.: General
18.1: Any notice required or permitted to be given by either party to the other under these Conditions shall be in Writing and addressed to that other party at its registered office or principal place of business or such other address as may atthe relevanttime having been notified pursuant to this provision to the party giving the notice

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18.2: No waiver by the Seller of any breach of the Contract by the Buyer shall be consider as a waiver of any subsequent breach of the same or any other provision
18.3: If any provision of these Conditions is held by any competent authority to be invalided or unenforceable in whole or in part the validity of the other provisions of these Conditions and the remainder of the provision in question shall not be affected
18.4: No liability, warranty or any other claim can or will exist for any product(s) during or as a consequence of or any consequence whatsoever resulting directly or indirectly from or in connection with any of the following regardless of any other contributory cause or event from :; Terrorism Terrorism is defined as any act or acts including and not limited to the use or threat of force/violence/harm or damage to life or property orthe threat of such harm or damage including harm or damage by nuclear and or chemical and or biological and or radiological means. Caused or occasioned by any persons or groups or so claimed in whole or in part for political religious ideological or similar purposes. Or, any action taken in controlling preventing suppressing or in anyway relating to the above.; War War or invasion, act of foreign enemy hostilities of a warlike operation or operations (whether war be declared or not) civil war rebellion revolution insurrection civil commotion assuming the proportions of or amounting to an uprising military or usurped power. Or any action taken in controlling preventing suppressing or in any way relating to any of the above.
18.5: Any dispute arising under or in connection with these Conditions or the sale ofthe Goods shall be referred to arbitration by a single arbitrator appointed by agreement or (in default) nominated on the application of either party by the president forthetime being of the Law Society.; Abssac Limited may make changes to the contents/ improvements and/or changes in the product(s) or service(s) described in this publication at any time.; August 2013.

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Search Satellite Roller Screws

Satellite Roller Screws

SATELLITE ROLLER SCREWS

Introduction

Satellite roller screws compared to ball screws

Load capacity and lifespan

Satellite roller screws like ball screws use Hertz's law.

Speed & acceleration

Lead & pitch

Rigidity & strength

Types of roller screws

RV and BRV screws

RVR screws

Types of roller screws

RVI screws

RVD screws

Identification system

Design

Nut types

Nut design

Seal

Screw diameter d0

Nominal lead P

Thread direction

Thread accuracy

Accuracy

Lead error

Lead accuracy symbols according to DIN 69051/3

Efficiency

Advantages

Applications

Geometry

Nut geometry and shape

SINGLE NUTS

SPLIT NUTS

DOUBLE NUTS

FLANGE SHAPES

Preloading

Resulting load depending on preload Fv

Preloading examples

Preloading with rigid spacer (thickness calibrated by Rollvis SA)

Preloading with elastic washers

Mean speed and axial load

Nominal lifespan

Nominal lifespan of single nuts (with backlash)

Nominal lifespan of preloaded nuts

Rigidity

Satellite roller screw rigidity

Nut rigidity Cs

Nut rigidity Cme

Permissible buckling force Fknzul at rotation speed n = 0

Rotation speed

Permissible rotation speed and axial load

Critical speed nkr with axial load Fn = 0

Driving torque

Driving torque

Motor driving torque MM at constant speed

Motor driving torque MMa with acceleration

Calculation example

Satellite roller screws RV 20 x 5

Mean speed

Preloading

Load on nut half 1

Load on nut half 2

Mean load

Lifespan

Total lifespan

Nut rigidity

Satellite roller screw rigidity

Bearing rigidity

Total rigidity of satellite roller screw system

Driving torque

Lubrication

Oil lubrication

Grease lubrication

Handling advice

Assembly

Screw assembly

CAUTION

Handling

Screw diameter d₀

Resulting load depending on preload F_v

Nut rigidity C_s

Nut rigidity C_me

Permissible buckling force F_knzul at rotation speed n = 0

Motor driving torque M_Ma with acceleration