[Jewelry making - Article 00366] - Re: [Orchid] CAD/CAM grown model woes

[LSHancock]

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Richard,

>     How you those who use grown models deal with this? 

    I think your problem began by asking someone who has never burned
    out this material to cast successfully with information from someone
    who doesn't cast. 

    I have cast resin models and printed models. I've always followed
    this burnout formula as set out by Ransom and Randolph for the
    Ultravest investment: 

    Initially hold the flask at 300 degrees for 2 hours
    elevate to 700 over 2.5 hours
    hold at 700 for 2 hours
    elevate to 1350 over 3.5 hours
    hold at 1350 for 3 hours
    reduce to casting temp and hold for a final cycle of 1 hour

    This is for small flasks not over 2.5" in diameter. For medium sized
    flasks up to 4" in diameter increase the initial and final hold
    temperatures an extra hour. 

    Initially I had reservations with such a long burnout for small
    flasks, but it has never failed me. Perhaps you can pass this on to
    your caster for subsequent jobs. 

Hope this helps.
Larry
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