[Jewelry making - Article 00057] - Re: [Orchid] Investment casting really heavy sections

[Jeff Demand]

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Peter,

    A long time ago I had very good results casting 15mm thick sterling
    pieces on a 6mm sprue when I finally lowered the flask temperature
    around 500 degree F. The basic idea is to have your piece solidify
    before the sprue or button. As long as there is NO moisture in the
    investment you can probably cast at room temperature. A big reservoir
    on the sprue could also help. 

    Successful casting is a mix of scientific theory, consistency, and
    black arts. Think about what you want to happen, observe (and
    document !!!) what does happen and break any of the 'conventional
    rules' til the two match. 

Jeff

Demand Designs
Analog/Digital Modelling & Goldsmithing
http://www.gmavt.net/~jdemand
jdemand AT gmavt.net 

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