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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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Accurately bending threaded rod
I have a new a product that will use two pieces, 4" long of 1/4-20 threaded
rod. Each piece will need to have two 20 degree bends, each bend will be 1-1/2" from each end and on the same plane. A Nylon insert locknut will thread on each end about 1/2" to hold three pieces sandwiched together. This is an angled variation on a standard product that uses two 1/4" x 4" carriage bolts in a straight configuration. I have to figure out how to bend the rod to the correct angle and on the same plane without cracking the rod or boogering the threads where the nuts go. The application doesn't require extreme strength, the cheapest allthread is plenty strong if it isn't cracked. The requirement is for 1k pieces per day at a total cost of =$.20 each The problems I see are that the saw cut pieces have to be deburred to get a nut started and if I bend the parts in a form on a punch press, I'd be worried about smearing the threads and any secondary operation might push the cost window. Ideally, I imagine a die that parts the rod and bends it in one hit with a spring-loaded feeder that the operator drops in a standard 36" length of allthread every nine hits. |
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