[Jewelry making - Article 00145] - Re: [Orchid] Venturi Vacuum thoughts

[Shaun Pearton]

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    Hi all from sunny South Africa, Some more comments on the venturi
    vacuum. I have a self built vacuum caster which uses a PIAB mini
    vacuum pump to create the vacuum. Although it is called a pump it is
    actually just a multi channel venturi. It operates with a very low
    feed pressure of 0.4 Mpa which I get from a small home use
    compresser. To ensure a decent vacuum at the point of casting I have
    a small reservoir (about half a cubic foot) which stores a vacuum.
    The pumps are inexpensive and if you have a source of compressed air
    then there is no need to buy a compressor. The total cost of building
    my vacuum caster was less than $ 250.00 which included the
    compressor.The pump itself was about $ 80.00 and has a five year
    guarantee. 

    The pump produces a vacuum of - 760mm mercury which is the same as a
    shop bought vacuum caster costing $ 500.00. 

    PIAB have a website at www.piab.com. 

Shaun Pearton

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