[Jewelry making - Article 00946] - [Orchid] Curing investment under pressure for casting

[Andreas Grau]

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    So I visited a friend's workshop today to see his casting procedures.
    He's a dental mechano, so he is using wax, investment, burn-out and a
    centrifugal casting machine. No surprises here (after all, *we* stole
    this technique from *them*). 

    What struck me most, and I had quite some strokes about similarities
    and differences between jewellery and teeth, was his pressure pot.
    Let me explain: 

    He uses a vacuum mixing system, then pours into the cylinder, holds
    the cylinder briefly against a vibrator (orbital sander in a plastic
    bag) and then puts the cylinder into a modified pressure cooking pot
    and throws 2 bars into it. 

    So: The investment cures under pressure. He arguments that any
    remaining bubbles will be much smaller and that the investment is
    much more compact, giving an even smoother surface. 

    We played around with all his toys; Boy, what a day! But on my way
    home I kept thinking "pressure pot". Anybody has experiences with
    pp's in jewellery casting? Or general insights and opinions? 

Thanks,
Andreas
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