[Jewelry making - Article 01460] - Re: [Orchid] Designing settings with CAD for 3D printing

[Wayne Emery]

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Dan,

    Great post. 

    Yes, there IS really SOME shrinkage inn the metal, but the
    controlled tests we ran for 3D Systems and their growing substrates
    vs Kerr hard green wax indicated that the investment created more
    "shrinkage" problems through expansion than the metals did via
    actual shrinkage from the melt. The exceptions, as I recall, were the
    Pt alloys, which gave the greatest shrinkage from liquidus to solid
    state. 

    In conjunction with that, I did a survey of 50 accomplished bench
    people (and included my own vicarious experience in the repair and
    manufacturing end). The question was: 

    Given the average ring casting, how much actual removal of metal
    takes place in YOUR finishing process? No guesses, please, actual
    measurements. 

    It was a true learning experience for many, including myself. The
    average was 0.3 mm, with care. In ALL cases, that exceeded any
    differential caused by "shrinkage". 

    In the end, because we were in the business of selling CAD and CAM
    solutions, including mills and "growing" machinery, our "suggested"
    answer was to apply 7-10% upwards 3D scaling to the CAD model, and
    experiment from there. 

    Concerning the creating of prongs and bezels in the CAD model (to be
    cast), I have some serious reservations, but I'm sure you do, too. A
    discussion for another time, perhaps. 

Thanks again!
Wayne Emery
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