[Jewelry making - Article 00090] - Re: [Orchid] Tumbling to work harden

[James Binnion]

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    The hardening depth will depend on how powerful your tumbler is and
    how long you run it for. Steven Alviti of Bel Air Finishing Supply
    wrote a paper for the 2002 Santa Fe Symposium on steel shot
    burnishing titled "The Effects of Burnishing on the Surface of Cast
    Gold and Silver Jewelry" in it he states that "The surface hardness
    was increased by an average of 22% using vibratory, roll and pin
    burnishing and 13% using disc burnishing." His measurements were
    only of the surface hardness, You would need to do a cross section
    and a micro hardness tests to determine how deep it goes but a 22%
    increase is significant. 

HTH
Jim

Jim Binnion

James Binnion Metal Arts
Phone (360) 756-6550
Toll Free (877) 408 7287
Fax (360) 756-2160
http://www.mokume-gane.com
jbin AT mokume-gane.com
Member of the Better Business Bureau


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