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Thread: Moment; Mitigating Lever Forces

  1. #1

    Moment; Mitigating Lever Forces

    Hi everyone, I'm creating a mechanism to lift a weight and I need to make sure I'm calculating correctly in order to design the correct spring. The first image below shows you my current design, but I have realized that there is a lever action here that could drastically increase the force on my spring. In the moment diagrams I have outlined how I think I can mitigate the lever action by bringing the spring past the pivot point and therefore eliminating the lever action. What I would like is for someone to correct my maths and basically show me what the force on the spring really is. Thanks

    Current setup: see image 1

    Force on spring: 18 x 9.81 x (0.170/0.040) = 750 N's

    Potential Setup: see moment 2 image

    Force on spring: 18 x 9.81 x (0.17-0.022) = 26 N's
    Attached Images Attached Images

  2. #2
    Your first image seems to indicate the use of a torque spring on that short lever arm. But your diagram indicates a linear spring in compression. Which is it?
    And your diagrams don't have enough information to calculate the force on the spring. A free body diagram would be useful to you.

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