[TheForge] Re: Timken Case Hardening was File Making

[Andrew Vida]

Mike Spencer wrote:

> Okayyy, so how do you -- er, they -- make spherical bearing balls?  I
> recently had some enlightenment from the list about making flat things
> using three pieces and a scraper.  So how you you make spherical
> things to close tolerance?

	There are high precision grinders that will get you 98% there.  I would 
imagine that the rest would  be lapping the pieces into each other.