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hydraulic shear holddown clamp

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Posted By<" ">Dale Nelson on July 13, 2002 at 23:13:30:

I have spent the last year designing and building a hydraulic powered metal shear with a capacity of 1/2 by 48" mild steel. The shear has given me no problems, but trying to find a formula to determine the force required to securely hold the steel in place while shearing is nowhere to be found. I have found formulas to calculate force required to shear steel according to the shear angle, but that doesn't help. I know that the distance the clamp is from the shear blade is directly related to how much force is required to prevent the steel from lifting off of the table. I guess what I need is some kind of ratio of shearing force to holddown force. Any suggestions?

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