[Jewelry making - Article 00033] - Re: [Orchid] [Source] Vacuum casters

[JoAnna Kelleher]

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    Hi Alma, We use a Memco Electro-Vac Casting System which just does
    the casting, although it does it very well. It also cost us a several
    thousand dollars, as I recall. What I like about it is that it uses a
    nitrogen/hydrogen cover gas that nearly eliminates all firescale.
    Also the crucible temperature is digitally controlled. I am really
    pleased with it. Of course, we do commercial casting for other
    jewelers, so it pays for itself. 

    As far as the flasks, ours requires the perforated flasks with the
    lip/flange around it. The perforations allow for a greater vaccuum
    pull during the casting process, which I believe makes for better
    casting. 

    We also use a Memco Oven Controller for our kiln, which allows us to
    program all of the burnout stages. I can invest in the afternoon, put
    the flasks in the kiln in the evening and cast the next morning.
    Sweet! 

    We are still working on streamlining the investing process. We use a
    small vacuum table for vacuuming the investment and it's difficult to
    do more than one flask at a time. But we're working on it. 

JoAnna Kelleher
Pearl Exotics Trading Company
Progressive Jewelry - Commercial Casting - Tahitian Pearls
www.pearlexotics.com

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