https://forums.autodesk.com/t5/machining-discussions-forum/drilling-aluminum-full-or-partial-retract/m-p/6098763#M4479 I'm just learning this stuff.  I think I'll do some testing with some different drill bits and try various feeds and speeds. The parabolic bit looks interesting. Fri, 30 Oct 2015 12:38:53 GMT SGoldthwaite 2015-10-30T12:38:53Z