[Jewelry making - Article 00411] - Re: [Orchid] CAD/CAM grown model woes

[Les Brown]

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>     Now, the best solution to dealing with the near-ubiquitous ash is
>     to blow it out of the hot investment with an air gun, then return
>     the investment to the furnace for a minute or three to assure an
>     even re-distribution of heat before casting. I know what you're
>     thinking, but there has been no damage to the investment after
>     doing this many thousands of times. Sounds crazy, but it works. 

    Re Wayne's comment above. The problem with blowing out the mold - or
    any other closed cavity is that - the the offending material can't
    really get out very easily because the flow of air is going in. I use
    a vacuum cleaner, hose clamped in an upright position with a heavy
    piece of wide meshed screen over the end, on which I hold the mouth
    of the hot mold just prior to placing in the casting machine. This
    has proven immensely effective in getting out any loose investment
    particles or kiln insulation bits which have fallen in during
    burnout. 

    Do not try this without the "buffering" screen. Putting the hose end
    directly against the mold will actually suck out any thin investment
    formations and even the core section of a ring. Believe me. I know. 

Les Brown
L.F.Brown Goldwork
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