Any ideas on which material to actuate a robot hand?

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Hey guys, I was wondering if I could get a little info

I'm building a robotic hand for a masters project. I'm interested in looking into actuating some of the joints using a 'dohelix' method, where a flexible plaited cord is twisted by a DC motor on one end to produce a translation on the other.

I was wondering if anybody knew of what material (or specific properties) I should be looking to use for the chord, or could anybody point me in the direction of a formula which could determine the translation of the material given the density, elasticity, size etc when twisted. I have an idea of how to calibrate the system and allow for deformities through use, but the material needs to be fairly robust, flexible, elastic, thin etc.

Any ideas or suggestions would be greatly appreciated

Martyn.
 

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