Originally Posted by
BSmith
No, we do mold work. But if you are machining aluminum .002" out of square over an inch when the machine is square within 80 millionths over the entire travel... With it being done on the same op, you should be a LOT more square than .002 over 1".
I know, there's a tolerance, and if you hit nominal within a couple tenths (ten thousandths of an inch) every time when the part only needs +-.002 then you're wasting time. But, this is a squareness issue on a setup that is inherently square.
FWIW, I can indicate a 15" part that was hard milled (52-54 HRC), and the perpendicular side is cut 4" down and see no more than .00003" total movement on the indicator and not uncommon to see it within .0001". All that is cut in one op. Deck the top, mill the sides.