Charles A. Sherwood wrote:

I have always been told that carbide has a certain minimum depth of cut.
If you try to cut only 1 thou the toolbit can't quite dig in and cuts
part of the time and rides on top part of the time producing a poor
finish.

This is true of *any* cutter that is not *really* sharp. If you use
uncoated carbide inserts that have a good edge (you can hone them
yourself with a diamond hone), they work fine. I've done this lots of
time with TNMP-321's in my tool holders.

Ted