It's a slap in the face also to those poor graduate nurses expected to work for pittance while those at the top rake
What it is: A crater becomes worn into the top rake
face of the insert.
That combination enables us to do things with the top rake
of an insert that we weren't able to do years ago.
In the case of negative rake tooling, the normal carbide tool geometry of -5 deg top and side rake may be changed very advantageously to -5 deg top rake
-10 deg side rake for materials under 45 Rc hardness.