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Advanced Engineering 2021

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Helical beam advantages

Helical beam advantages
When parameters such as torque and angular shaft misalignment are outside the norm, Abssac reckons the helical beam flexible shaft coupling can be a useful ally. The advantages lie in the product's ability to change the helical beam configuration. In effect, 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. Then the option to use multiple start coils, such a double and triple start coil configurations, can ultimately provide higher torsional stiffness to the part.

An additional advantage is that high strength materials such as 17-4PH CRES steels can be used as well as aluminium.
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