Results 1 to 4 of 4

Thread: spring rate

  1. #1
    New Member
    Join Date
    Dec 2017
    Posts
    3

    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
    Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,625
    What kind of spring s it?

  3. #3
    Technical Fellow jboggs's Avatar
    Join Date
    Mar 2011
    Location
    Myrtle Beach, SC
    Posts
    908
    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
    Principle Engineer
    Join Date
    May 2015
    Posts
    216
    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •