# Thread: Moment; Mitigating Lever Forces

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

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.

#### Posting Permissions

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