Awl --
Any guidelines for "ideal" finish passes? When is a cut too lite?
Also, if you want to save doing a whole 'nother pass, what's a good compromise of material AND finish?
Is it impossible to generalize, or are there rules of cnc thumb?
I've noticed that in lathe cuts (manual), I can sometimes get a mirror finish on alum at .010, but wrinkles at .005.
Part of the Q is the concern about "rubbing".
However, I have also been told that a great method for holding tolerance on a part is to do second passes at zero finish cut, iow, the same coords as the previous cut.
Which I have noticed can sometimes still seem like a .005 cut!
When I was making a fixture recently (V grooves), I noticed that I could do
*numerous* passes at the same coords, and hear cutting! The bar was held pretty well in two kurts, or so it seemed to me.Someone told me that in this case, I should have V'd just one face at a time, altho I don't quite see how V'ing both faces could have required so many identical finish passes.
I'm thinking regular HSS endmills, 6061 alum, but discussion of any combo of cutters/material would be illuminating, I'm sure. Does carbide make a diff, ito finish passes, esp in soft-ish mat'l?