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Calculate the length of a coil spring??

Discussion in 'Chit-Chat' started by Etsha6, Mar 16, 2006.

  1. Etsha6

    Etsha6

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    Anyone know how to?

    I need to know the length of bar/wire needed to form a spring.
    Anyone know of a formula?

    Not interested in Hookes Law or simple harmonic motion or any other spring formulas, just the actual length of the wire used to make the spring.

    Thanks
     
  2. denis

    denis (O) toyota nut (O) SILVER Star

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    number of spires * Pi * centerline diameter
     
  3. Etsha6

    Etsha6

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    Thanks Denis,

    That would give a close approximation for a thin wire spring with coils close together.

    Im looking to calculate the length when the coils are not close together, say one coil revolution per 3 x diameter in axial length. ie like a very stretched spring.
     
  4. denis

    denis (O) toyota nut (O) SILVER Star

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    OK. say you unroll just one coil like you would a cylinder. now you have a basic straight wire with a length that equals the hypothenuse of a right-angle triangle with a base length of Pi*D and a height of H = 3xD.
    So you have L = D x sqrt(Pi² + 9)
     
  5. WristPin

    WristPin

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    so theres such a thing as Hookes law???

    gonna have to research this one.

    wouldnt the combined energy of the coil multiply the initial winding of the corresponding friction threshold?
    regardless of pi??
    if you multiply lenght of wire times height of coil time pi, the appiled resistance
    it will be one third less than the desired wieght distributing area.

    area time force equals pressure.

    wait, that another law...
     
  6. denis

    denis (O) toyota nut (O) SILVER Star

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    all bets are off with a stretched coil since we can't consider the bending forces as negligible.
     
  7. Etsha6

    Etsha6

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    Eureka!

    Answers are much clearer when the question is conceptualized clearly. Now to check the algebra!

    Thanks
     

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