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  1. SurfaceIDguy

    Torsion spring design issues in a gripping device

    Hello Again, So based onm this drawing: http://surfaceid.com/spring_images/091805_torsion_spring.png If the Spring deflection is 60 degrees, the spring moment is .246", and the force exerted on the spring is 1 lb, then the spring constant is .0041 If the spring deflection is 45 degrees, the...
  2. SurfaceIDguy

    Torsion spring design issues in a gripping device

    I think this link should work for torsion calculation. http://www.engineersedge.com/spring_torsion_calc.htm I found it this morning... will calculate it later today. Sean K.
  3. SurfaceIDguy

    Torsion spring design issues in a gripping device

    I've changed the design a little in terms of od, id, and the spring compresses rather than extending to get the load required. See the attached link. It provides all the dimensions, as well as the 2 positions of the leg, compressed (the stored position) and relaxed...
  4. SurfaceIDguy

    Torsion spring design issues in a gripping device

    We would like our product to have a lifetime warranty. Meaning that the spring will never wear out. I know this may be ideological, and if we had to put a number on it I think it would be around 300000 or 400000 uses. The other factor that may be an issue is the fact that in the stored mode...
  5. SurfaceIDguy

    Torsion spring design issues in a gripping device

    Yes, that is correct. The current deflection at 30 degrees is .5 lbs. My wish for 8 lbs was actually a mistake. I was trying to judge the optimal resistance by estimating the 'feel' of a spring loaded product I have with me. I do have a prototype of the current product with a 30 degree...
  6. SurfaceIDguy

    Torsion spring design issues in a gripping device

    The direction of the legs are normal to the axis, not parralel with it. I can post some images online if it will be helpful to visualize the spring, and the context in which it is being designed for, as my terminology may be a little off. In terms of the load, in the closed position I am...
  7. SurfaceIDguy

    Torsion spring design issues in a gripping device

    I am an industrial designer and have designed a miniaturized gripping device that contains a torsion spring in a chamber to force the handles of the device into an open position. The device originally opened 30 degrees, however we needed to shorten the device, causing the new opening size to be...

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