Quote:
Originally Posted by Gary Dillard
I think you mean EDM, not wire EDM, for boring the holes. Holes are made with an electrode, versus a wire which is used for cutting. SPAM was able to bore all of theirs with standard carbide tools; I don't know how difficult it was (they have a "real" machinist on the team) but as far as I know we didn't ever break any. Still, EDM for powdered metal is probably preferred if you have a choice.
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Actually, a wire EDM machine can do this job too. It works because there's already a hole in the sintered gear (through which you can feed the wire). (188 has occasionally used this method for cutting gear bores.)