New regrind classification Good Like new
Modern High speed Multiaxis machines running performance carbide need regrinds that are perfect and all exactly the same, so that surface finishes is consistant and programs do not need to be changed to accomodate the use of resharpened cutters
In the early days end mill sharpeners like the cuttermaster serviced conventional and early CNC shops quite well in a falut tolerant environment.In todays high production , non fault tolerant environment the tools are different and the requirements are different,
The end of an end mill is where the rubber meets the road, this contact determines tool life and critical finish, This geometry is the most difficult to reproduce when regrinding, SO it should be automated. Combined with the fact it is complex operation creating dust that is a health/ envoronmental hazard.