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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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First ever "precision machining" project -- AL cutting
Finally I need to make something to good precision, which is to make a
mounting plate for a US Digital encoder. The spec says shaft misalignment should be under 0.01", which means that the individual mounting holes need to be even more precisely placed, so as the cumulative error will stay within spec. Anyway, step number 1 is to cut a 4x1/4"x12" aluminum flat into three pieces. I would like to do this on a Bridgeport and to use a thin endmill, so as to keep as much material as possible. Should I use carbide or HSS and what speed would you recommend for, say, a 1/8" endmill? Second question, I will need to tap #4-40 holes in same aluminum. How risky is this as far as tap is concerned and should I use lubrication? i |
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