[Jewelry making - Article 01228] - Re: [Orchid] Ratio of wax to sterling

[Refined Designs]

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    Hi Sandra, The conversion from wax to sterling is 1 to 10. I double
    checked specific gravities in Oppi Untracht's book: wax has a SG of
    .95-.98 and sterling is 10.4. I know this wasn't in your question, but
    I thought it might be helpful to those who carve a lot of waxes. I
    use my carat scale to weigh the waxes I'm carving and with a little
    high school math figured out the conversion: carat weight x .1286
    equals dwts. That obviously gives you the weight of the wax. Then I
    went a step further and multiplied .1286 by the specific gravity of
    the metal to be used. For example, the SG of 14K yellow is 13.07, so
    I multiply 13.07 by .1286 which equals 1.68. Personally I round it up
    to 1.8. Sooooooooooo, when I plunk my wax on the carat scale, I
    simply take the carat weight figure on the scale (say, 2.5 for an
    average ring for example) and multiply it by 1.8 and that immediately
    gives me a good idea of what it would weigh in gold (not including
    sprue). To simplify: -for 14K yellow: multiply weight of wax in carats
    by 1.8 -for 18K yellow: multiply by 2.0 -for platinum in general:
    multiply by 2.8 or so -for Sterling Silver: multiply by 1.3 Maybe
    others have found conversion numbers they prefer, but this works for
    me! 

Cindy 

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