Posted by Tim O on April 17, 1999 at 11:32:55:
In Reply to: Re: Pilot bearing burnishing? posted by J. Calhoun on April 17, 1999 at 07:23:14:
In the world of machining and manufacturing burnishing is done to accurately size and povide a finish in an economical way for a hole or bore. You leave the bore undersize with a rough surface finish, this is done by cutting at a controlled high fed rate which leaves small ridges, similar to an extremely fine and shallow screw thread. The burnishing tool then is fed into the part while either one is rotating. The burnisher is set so the diameter across the rollers is larger than the hole ID. This extrudes the ridges of the bore into the valleys and creates a very smooth and accurate bore. It is much faster and repeatable than trying to hold size with a cutting tool alone. Probably more info than anyone in their right mind needs.