Originally Posted by
rydabent
Unless you have VERY high priced machines to polish bearing to the same size and the races to the right specs, this is a bad idea.
New bearings are not that expensive.
I believe the OP is asking about polishing the races, not the bearing balls. The balls used in the polishing process will be discarded and replaced with new ones. Unless he uses a very coarse polishing compound he will not change the dimensions.