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Thanks for the input ~ Richard's theory of lapping makes a lot of sense.

Timken bearings are top of the line. Is your roommate still there? The answer, it seems, lies in the "secondary ops" for the precise finish. Not asking for trade secrets, just a general idea. I threw this out at break this morning with some of the old mech eng guys and they were as...

Good question. I've been wondering how they make ball bearings so precise for ages. Someone?

Don't know why it would matter ... used to be punched and ground for jig saw. Band saw/sawzall appears to be simply punched and tempered. Care to discuss how they make Orings?