• Machined Springs
  • Compression, extension, torsion, lateral translation and lateral bending springs

Machined Springs

The next time you require a spring in a critical or high duty cycle environment, the machined spring from may be the answer to your design problems. The product is machined to meet exact customer size and performance requirement. Machined springs are a formidable package and for those engineers familiar with the traditional wound spring format we are offering a new way of looking at both performance and attachment. As the name suggests, ABSSAC supplies a spring that is machined from one piece of material.

Compression & Extension

Compression & ExtensionGo

Torsion

TorsionGo

Lateral Bending & Translation

Lateral Bending & TranslationGo

"We can't solve problems by using the same kind of thinking we used when we created them" Albert Einstein

For those engineers familiar with the traditional wound spring format ABSSAC is offering a new way of looking at both spring performance and attachment.  As with its wire wound brother, all types of spring format such as, compression, extension, torsion, lateral translation and lateral bending springs are available in the machined format. However, from this point the similarities between wound and machined springs stop. Machined springs can provide very precise, linear deflection rates because virtually all-residual stresses are eliminated. As a result, there are no internal stresses to overcome before deflection occurs, which can be the case in the wire wound spring. In addition to this we can offer multiple start spring coil configurations.

The next time you require a spring in a critical or high duty cycle environment, the machined spring from may be the answer to your design problems. The product is machined to meet exact customer size and performance requirement making machined springs a formidable package.

We often ask.....Do you know what a machined spring is ?

Whilst we all agree that traditional wire wound springs have numerous applications, the very nature of how they are manufactured can limit their reliability and performance in the more demanding or high duty cycle spring applications. Machined springs benefit overall system designs through enhanced functionality, increased precision and cost reduction as a result of true engineering expertise. Time and time again we have reduced the burden overhead within mechanical systems with the machined spring product.

  • Machined Springs
  • We excel in the amalgamation of parts
    We excel in the amalgamation of parts
  • 12 parts into ONE
    12 parts into ONE
  • Precision performance compression springs
    Precision performance compression springs
  • Highly optimised machined spring
    Highly optimised machined spring
  • Flight critical torsion spring
    Flight critical torsion spring
  • Attachment choice is endless
    Attachment choice is endless
  • Titatnium Torsion spring
    Titatnium Torsion spring
  • F.E.A. optimises performance
    F.E.A. optimises performance
  • Totally linear spring rates can be achieved
    Totally linear spring rates can be achieved
  • Three parts into one part
    Three parts into one part
  • Machined Torsion Springs
    Machined Torsion Springs
  • Torsion springs
    Torsion springs
  • Integral tang attachment
    Integral tang attachment
  • Torsion spring examples
    Torsion spring examples
  • Pure moment attachment torsion spring
    Pure moment attachment torsion spring
  • Titanium compression spring
    Titanium compression spring
  • Integral attachment into single unit
    Integral attachment into single unit
  • F.E.A. is employed to optimise performance
    F.E.A. is employed to optimise performance
  • Triple start compression spring
    Triple start compression spring
  • Springs – Lateral Bending
    Springs – Lateral Bending
  • Finite Element analysis for spring rate prediction
    Finite Element analysis for spring rate prediction
  • Unique pure moment attachment
    Unique pure moment attachment
  • 00:00 / 01:00
    • Published: Tuesday 19th April 2016
    • Updated: Tuesday 15th January 2019
  • 00:00 / 01:00
    • Published: Tuesday 19th April 2016
    • Updated: Tuesday 15th January 2019

    Abssac's full animated explanation of the unique machined spring product.

    Abssac is a supplier of precision machined rotary, linear and specialist engineering products.

So what are the advantages of the machined spring ?

mach spring cat image 7.jpg VSmach spring cat image 8.jpg

Wound Springs

Only single coil spring configurations available
Non predictable linear rates
Variable spring rates in batched quantities
Parts have to be ground to ensure accurate internal and external tolerances
Accurate mixtures of Cartesian spring rates are not available
Has residual stress effecting performance
Special or custom end attachments have to attached to the wound spring after manufacture
Limited material utilization
Less reliability & performance to the system
Variable parallelism and perpendicularity during use

Machined Springs

Single, double and triple coil start spring versions
Predictable linear rates are available to meet application requirements 100% repeatable rates (up to 1% on rate)
Each part is supplied to meet exact customer size and performance requirement
Dimensional variances are typically much smaller in machined springs
Can be configured to your compression, extension, torsion, lateral translation, lateral bending rate - or a mixture of predetermined rates
Can have virtually no residual stresses in final part
Special or custom end attachments can incorporated into the one piece design
No need for multiple suppliers
Variety of materials including titanium, stainless steels, high strength steels and engineering plastics can be utilized
Unbeatable parallelism and perpendicularity delivering reliability and performance to the system

mach spring cat image 3.jpgSingle, Double and Triple start machine spring advantage

Single start machined springs can satisfy most applications but in some cases we also consider double start or indeed triple spring configurations which have two or three intertwined continuous coil elements, still within the same single part construction. In effect, this puts multiple independent helixes in the same cylindrical plane, which provides totally enhanced spring performance. With the machined spring, perpendicularity, parallelism, lateral bending, axial and torsional rates can be guaranteed. We like to think of it as.... PRECISION ELASTICITY.  Multi-start springs have many advantages. When applied to compression and extension springs, a single start spring provides a reaction force plus a moment. On multiple start flexures, all internal moments are resolved within the spring itself, which translates into excellent compression or extension parallelism.

Abssac Machined Springs - ask for one of our demo packs to be sent for your attentionUniquely, you can amalgamate parts of the total spring assembly into the single part ...

Once the working dynamics of the spring are calculated and agreed, we can then look at the method of attachment. In many cases the machined spring incorporates other parts of the working mechanism into the single part, such as flanges, gears, splines etc, making the final item more reliable. The choice of end attachment is really up to your imagination. !

The advantages of the machined spring products are numerous having proven itself in medical, aerospace, semiconductor and motor-sport industries to name a few. Wherever a wound spring is not able to meet your performance criteria or a new spring design requires ultimate accuracy and repeatability, the machined spring is the ideal partner. If you require further technical information, please do not hesitate to contact our sales engineers who will be more than happy to help you with your selection. Ask here for one of our demo packs to be sent for your attention»

 

Predicted Performance

mach spring cat image 2.jpgFinite Element Analysis (FEA) is employed to verify the feasibility and performance of the machined spring. For example, the stress in compression and extension machined springs is dominantly torsional shear, where as the stress in torsional machined springs is dominantly pure bending stress. The advantages of the machined spring product are numerous having proven itself in medical, aerospace, semiconductor and motor sport industries to name a few. Where ever a wound spring is not able to meet your performance criteria or a new spring design requires ultimate accuracy and repeatability, the machined spring is the ideal partner.

Machined Springs provide reliable, linear spring rates

6CC(1).jpgWhen considering the dynamics of the machined spring the we look at the 6 possible Cartesian co-ordinates, those being X,Y,Z and then the ROTX, ROTY & ROTZ (please refer to illustration above)

 

A wound spring tries to deliver all 6 axis potentials when it is asked to move. A machined spring can be a single degree of freedom system, delivering motion in only one of the possible six axis and the double start machined spring is the closest single Cartesian co-ordinate deflection part available with today's technology. However it must not be forgotten that it is also possible to predict and deliver multi Cartesian axis springs. For example, some applications have demanded an accurate mixture of compression, lateral and torsional spring rates. !

Some examples of success

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Why not set us your spring challenges . Give us a call on 01386 421005

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