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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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plastic shear screws
Last year, I was air blast spraying the orchard, got out of position
when turning and caught the spayer head on a three inch tree branch. Broke the head right off the machine. Imovable object meets iresistable force. OK, I've been rebuilding this for the last several days. I made the mating surface from the air fan to the head two flat plates with eight 1/4" bolts holes around the outside of the duct. I want this to be the weak spot this time. Steel, even grade 1, is too much, I guess. Page 3042 of Mcmaster Carr has these plastic bolts http://www.mcmaster.com/#catalog/119/3042/=m142xv Could anybody give me an estmate of the relative strength of nylon, polycarbonate, and PTFE, to grade 1 steel in 1/4" bolts? other considerations on best shear bolts? Other material choices? Karl |
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