How are billiard balls and ball bearings produced to be
A good summary of the process is located at this link:
or do a search at www.howstuffworks.com for "how are bearings made?"
Basically, wire is headed (sort of a combination stamping/cutoff
process) into a rough sphere, then a special grinding machine is used
to get them perfectly round. The machine runs the balls through
grooves much like in a bearing assembly, but under pressure and with
varying grades of abrasives. A succession of these machines, each
grinding more and more finely, produces consistenly sized and smooth
Hope this helps!
David Brandt, P.E.
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Update: June 2012