[Jewelry making - Article 00171] - Re: [Orchid] Investment casting really heavy sections

[Daniel Grandi]

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    Whenever we have cast extremely heavy sterling silver handles and
    large pieces of hardware in Bronze and in Silver, We have done so by
    using a single sprue... 1/2 inch in diameter... it is best to flare
    the round sprue into the ball that is being cast.The sprue length
    should be about 1 + inches long. 

    Flask temperature and metal temperature become very important as well
    as casting method. Normally, I would recommend Vaccuum casting at a
    flask temp around 450 to 500 oF. If you find some porosity in a
    particular area, put a riser in that area to get rid of the porosity
    / gas problem. 

Daniel Grandi
sales AT racecarjewelry.com

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