[Jewelry making - Article 00079] - Re: [Orchid] Metal set-up time

[Deb Jemmott]

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>     The vacuum pulls air out of the mold.  It does not pull the metal
>     into the mold.  Gravity pulls the metal into the mold. 

    I'm having a lot of trouble understanding this. Are you telling me
    that if I had a mold where the air could get out another way, I could
    just pour the metal in and it would fill the mold due to
    gravitational forces alone? I don't think so.... doesn't metal have a
    high surface tension and tend to stay in a ball? Isn't that why the
    vacuum or the centrifuge or sling work? I know that gravity casting
    works with cuttlebone or charcoal, but usually not with the detail
    you can get with vacuum or centrifugal casting and the sprue area has
    to be so large. What am I missing? 

Thanks 
Deb

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