[Jewelry making - Article 00454] - Re: [Orchid] Guestimating wax to silver weight

[MAC]

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Hi DeDemetal,

    In my jewelry design class, I was taught the following formula for
    calculating the required amount of sterling silver (ss) casting
    grain: weight of the wax model (in grams) multiplied by 14 plus 5
    equals weight (in grams) of ss casting grain. 

    I was taught that the "14" value represents the silver casting
    itself and the "5" value represents the button/sprue. 

    Based on this formula, a wax model weighing 2.5 gm x 14 = 35 + 5 =
    40 gm required ss casting grain 

    I used this formula with both blue (softer) and green (firmer) wax
    models for more than 10 castings for class projects. My results were
    completely satisfactory, as were those of all my classmates who
    weighed/calculated correctly. I always added a few casting grains
    "for good measure" and am still recycling my buttons/sprues into
    cuttlefish castings. 

HTH, and happy, successful casting!
MAC

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