[Jewelry making - Article 00366] - Re: [Orchid] Replacing vacuum pump on investing table

[Dan Wellman]

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    Another important factor to consider is that the inside diameter of
    the lines you use to hook up your system, they will also be a
    limiting factor on the capaity of the vacum pump. I would reccomend
    at least 3/8 copper tubing with a pigtail (full 360 degree loop).
    Hoses can pinch down internally even if rated for vacum use. The
    accumulator (vacum tank) can function well to keep debris out of the
    pump inself. Moisture will probably find it's way into the pump oil
    with your usage. I suspect frequent oil changes and use of the gas
    ballast would be a good idea. An alternative would be to have the
    accumulator kept cold to force the moiture to condense there and
    trap out. I don't do casting but have used a vacum pump extensively
    for 20+ years and my advice is based upon that usage in dehydrating
    refrigeration systems. Hope this helps. 

Dan Wellman
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