Need help with material expansion question

  • Thread starter Tawaffles
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Hi

To start off, im a product designer by trade so im sorry if this question is reminiscent of GCSE physics. My project needs to rotate a large but reletavly free moving shaft (about 2in diameter) with temperature. I would like to achieve around 15degrees of rotation with a heat range of around 200 degrees (60-260C). This is for a third world environment so I cant use exotic materials.

My idea is to wind a strip of material around the shaft and fit it to a stationary block. The heat will cause the material to expand, and will cause the shaft to rotate. The more windings I have around the shaft, the more rotation I can expect to achieve.

Does all of this sound plausible?
Is a material like copper the best for this purpose, or something like aluminium?
How do I work out the expansion of a metal with heat?

Thank you!

James
 

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