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> Tumbling affects only a thin surface layer, perhaps a half
> millimeter deep at best,
Not even that on jewelry scale machines and objects. You cant get
enough energy into the work. Maybe with a Centrifugal Barrel Finisher
that has a 5HP motor and your work would look like it had been beat
to death. It takes real movement of metal to get that kind of depth.
James Binnion Metal Arts