[Jewelry making - Article 00358] - Re: [Orchid] CAD/CAM grown model woes

[Paul D. Reilly]

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Richard,

    To start, I am no way associated with any of these printers/ growers
    other than being a user of their respective products. 

    There are a few different systems out there used to grow models from
    a CAD design. Yours sounds like a resin model from a particular
    (unnamed) company's machine which is notoriously difficult to burn
    out completely (even though they claim it to be and even issue a
    recommended burnout schedule with th models) without getting porosity
    or "cauliflower" textured surfaces on your castings. There has been
    some speculation that a rapid burnout cycle (presented at the 2007
    Santa Fe Symposium) will give improved results in casting; but
    experience (mine and others I correspond with) show this process to
    require a specialty high strength investment and, yet still, the
    results are only somewhat improved and only in smaller or lighter
    weight objects. For now I recommend molding of any of the resin built
    CAM models and then casting a wax (or a HD ^TM ) injection from
    there. 

    There is one model printer (contact me off line for the info) that
    produces a wax/polymer model that can be cast directly with results
    every bit as good as casting a regular wax model. The printed
    resolution of these models seems to be every bit as good as the
    others that I have tried (and in some cases, even crisper). 

    Beyond printing/growing, there is milling as a possibility for
    producing your model; provided that your model is compatible with
    the method.
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