[Jewelry making - Article 00438] - Re: [Orchid] Making micro mosaics

[James Binnion]

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>      The outside stretches and the inside compresses. 

    The rule is Pi x (diameter + the stock thickness ) for the inside,
    and Pi x (diameter - the stock thickness ) for the outside. 

    Pi=3.141 will work for studio calculations 

    It actually is a little more complicated. The above equations assume
    that the metal does not compress or stretch. Metals do both when
    bending and rounding up. Also you will need to allow for a little
    extra length to file the ends to clean them up for soldering so you
    have to add a little fudge factor for the rings to come out right.
    The amount of change depends on the metal you are working with and
    its thickness and  if it is fully annealed or not. If you measure
    carefully you will see the ring will also get slightly wider on the
    inside face and narrower on the outside face. Platinum does this
    more than gold and the effect is much more of a problem on thick
    materials than thin. 

-- 
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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