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Using a bimetallic coil to turn a pulley

  1. Aug 24, 2015 #1
    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.
     
  2. jcsd
  3. Aug 26, 2015 #2

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    ... and, working against what? Sounds like a metal tape measure, but I can't describe that as a "pulley."
     
  4. Aug 26, 2015 #3
    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?
     

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  5. Aug 26, 2015 #4

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  6. Aug 26, 2015 #5
    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.
     
  7. Aug 26, 2015 #6

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    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?
     
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