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Thread: spring rate

  1. #1
    Associate Engineer
    Join Date
    Dec 2017
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    spring rate

    Please forgive me for I am simple.I am going to build a 35mm film camera and need to include a simple shutter mechanism.The question I can't answer is about spring rate and speed the shutter would be closed by the spring so it goes like this.
    A spring attached to the shutter gate is stretched 1 inch for a force of 1 pound.The gate is released and the spring moves the gate to close the frame and end the film exposure.
    IF THE SPRING RATE IS DOUBLED BY STRETCHING 2 INCHES WILL THE SHUTTER GATE MOVE TWICE AS FAST WHEN RELEASED?????
    I am not including friction.
    Thankyou to all in cyber space!

  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    2,000
    What kind of spring s it?
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Technical Fellow jboggs's Avatar
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    Mar 2011
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    Myrtle Beach, SC
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    736
    All other things being equal, and assuming its not a constant force spring, twice the force applied to the same mass will produce twice the acceleration.

  4. #4
    Project Engineer
    Join Date
    May 2015
    Posts
    91
    As jboggs says twice the force.

    The spring rate is 1 pound per inch of deflection regardless of the length that you stretch it until you exceed the useful working length.

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