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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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A slo-mo crash, with little drama and no damage
I was making an arbor for a Norton aluminum-oxide 4" cup grinding wheel from
mild steel using the Clausing 5914 Lathe, and had a minor misadventure. The stock is a 2.5" diameter 12L14 alloy bar held in the 3-jaw chuck. The part I was working on is 1.000" diameter by 2" long, sticking out to the right where the 2.5" diameter bar has been turned down. There must have been two pounds of chips in the pan by then. Anyway, I'm making a near final pass under relatively slow power feed using a BXA-16N toolholder, and the flat full face of the carbide insert comes up against the machined end face of the bar. Instead of machining the face a little flatter, the whole BXA tool post rotates on the compound, causing the bit on the BXA-16N to dig a bit deeper. There were no groans or loud noises, but still this is not a good idea. Anyway, I realized what was going on, and managed to stop the show before anything bad happened, leaving only an undercut as evidence. Another lesson on the way to becoming a machinist. Joe Gwinn |
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