[Jewelry making - Article 01533] - [Orchid] Casting a detailed CAD/CAM piece

[david lee]

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    A friend of mine has asked me to help him prepare a piece for
    production that is outside my area of expertise; naturally I thought
    of you all. He has supplied me with several milled waxes that are
    essentially flat backed hemispheres 2 centimeters in diameter with
    lettering on the domed side. Here's the problem; some the fins of
    investment that form the letters have sheared off in casting. I
    wasn't particularly surprised, as the lettering has a line weight of
    only 0.4mm to 0.25mm and they are nearly 1mm deep. He likes this
    look and would sooner not make the lettering shallower, and I don't
    think the font could be made bolder (thicker line weight) and still
    fit. Here's the question; is there an investment strong enough to
    withstand this situation and still reproduce the detail? I have used
    Kerr Lab's Satin Cast 20 for years, and it has always done what I
    have asked of it beautifully (at least after I began to strictly
    follow the formulated instructions as to ratio of investment to
    water, and the water temperature / working time). I want to deliver
    to my friend a master model that he can have cast without extreme
    measures, or a high rejection rate. Any suggestions?
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