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The tong has points that imbed into the product. Therefore a gripping force of 100lb for a 100lb lift would be ok. If I had a product on a larger tong, say 20,000lb, a grip force of 20,000lb on 2 small points would easily imbed into the product, unless picking up something harder, like...

thanks again rb1957. can you look at my attached solution and let me know what you think? im kinda stuck on link FIK.http://files.engineering.com/getfile.aspx?folder=28b9138d-0563-4806-8e6b-e3d916c6da9b&file=freebody.pdf

rb / btrue, thanks for putting the thought into this... where i disagree with the geometric approach from rb1957 is that GD contributes to link BDF as a 2 force member in the y direction, but the contribution from link CDE in the x direction is not included. this moves the intersection away from...

i did a mock up dimensioned drawing and attempted to solve the linkage forces. the part size is 4 inch and weighs 100 lb. The tong weighs 10 lb. Any corrections or suggestions would be greatly appreciated. Would also like to eventually solve if picking up a 2 inch...

ok, so can a powerful analysis program be used to model such a beast? my problem is that, for a standard tong in my statics books, the tong point only contains an x-force component. easily solvable. sum the moments about the main pin, using half the product weight as a known vertical force at...

I appreciate the response to this "chinese finger trap". spider007 has nailed the motion. I attempted to recreate the mechanism in Analytix but cannot yield the grip force. I keep getting a redundant dimension. If in spider007's recreation the tong was lifting 100 pounds, what would the grip...

I am trying to figure out the grip force of a tong; however I think it is overconstrained and therefore is statically indeterminate. I've attached a bitmap of the design. Any opinions? Castigliano's theorem? Deflection method?