ABSSAC Ezine 2010

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Hello Sir/Madam,

The ABSSAC Ezine is always kept short and informative, whilst hopefully remaining worthwhile to anyone who is a user or buyer of linear and rotary power transmission equipment.As always, should you wish to no longer receive such quarterly updates please just hit the unsubscribe button at the bottom of the page.This newsletter predominantly looks at some product advances we have made.

We talk the torque

When application parameters such as torque and angular shaft misalignment are outside of the normal,or the existing shaft coupling you have just isnt performing as well as it should,  the helical beam product can be a useful solution to the design challenge.

The unique advantage lies in the products capability to change the actual flexible helical beam configuration, or “ flexure” as it is often termed. In affect, the flexure part of the shaft coupling can be tuned to suit individual application requirements.

For example, by varying the thickness of the flexure, the coupling can accommodate increasing amounts of torque and radial loads. The design engineer can specify the torsional stiffness and compression spring rates independent of other factors such as angular offset and parallelism acceptance. When the inside diameter of the flexure changes, so does the torque capacity, torsional stiffness and axial spring rates, without restricting your choice of bore sizes. When the number of rotations of coils is changed, the torque capacity remains unaffected, but all the other characteristics change.

Our Threads turn heads

 

The ability to supply a professionally tapped nut, matched to the thread of the supplied screw is the key to supplying quality linear application products.

In many cases you may be purchasing screw stock and specialised nut designs from different sources which can lead to poor fitting of the nut, excessive wear, backlash and low efficiency to the whole linear package.

When you want a more sophisticated nut design the chances are the part has more importance in the workings of the machine. By supplying both items from the one source, Abssac Limited eliminates this area of potential trouble.

 

Three springs in one.....

 

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. Multiple start spring configurations also significantly unify the lateral bending and lateral translation forces and moments around the springs circumference given a lateral deflection.

Double and triple start variants make the loading points irrelevant on the radius of the spring but increase the accuracy of parallelism. Multiple starts as high as five have been employed to unify the lateral reaction forces of machined springs.

Another advantage of multiple start spring elements is that they not only provide redundant elastic elements should a failure occur, but a failed element (coil) will be physically trapped by the remaining one and in many cases will allow the albeit reduced function of the spring design to still operate.

  • Single start machined springs are always available
  • Double start machined springs provide uniform end reaction
  • Triple start machined springs and beyond enhance the reaction uniformity.

 

 



 
 
   
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E1A The Enterprise Centre, Enterprise Way, Evesham, Worcestershire. United Kingdom. WR11 1GS

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Phone  01386 421 005   Email  sales@abssac.co.uk

 
   
 
   
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