Using a bimetallic coil to turn a pulley

[ENgez]

Hello,

I am looking at the possibility of turning a pulley using a bimetallic coil embedded inside.

How can I calculate the thermal "spring constant" of the coil, as a function of geometry and material properties?

Does anyone know of devices with similar actuation mechanisms?

thank you.

 

[Bystander]

pulley using a bimetallic coil embedded inside.

... and, working against what? Sounds like a metal tape measure, but I can't describe that as a "pulley."

 

[ENgez]

I attached an illustration to further clarify.

Will this work? If so, How can i calculate the angle of revolution as a function of temperature gradient?

 

[Bystander]

similar actuation mechanisms?

http://www.coleparmer.com/Brand/Buy_More_Save_More_on_Bimetal_Thermometers/2262?referred_id=20965&gclid=CNvZ9anWx8cCFUGUfgodiFwCdA

 

[ENgez]

Thank you for the reply.

I am aware that bimetallic coils are used to drive the needle in a thermometer.

What I am asking is if this concept can be used to do heavier work, like spin a pulley (wheel), and If there are examples of such mechanisms.

 

[Bystander]

like spin a pulley (wheel),

I keep tripping mentally over the word "spin." You say "spin," and I will think "rotate," and we'll proceed. "Carburetor stoves" are controlled by exhaust manifold dampers https://www.google.com/?gws_rd=ssl#q=exhaust+manifold+damper&tbm=shop
Number of turns in coil, plus size of counterweight, plus 90 degree rotation --- enough to go on?