[Jewelry making - Article 00535] - Re: [Orchid] Technology & Success

[T R. Hawkinson, Ltd.]

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    Dear Daniel, I stopped using any vents after I build my vacuum
    casting area with a super strong Welch Duo-Seal vacuum pump and one
    inch vacuum line. You don't need to screw around with venting with
    more muscle. I can cast 200 dwt easily and with 100% success this
    way. We cast 35 pounds of 14 karat this April without a problem. The
    engineers that make jewelry vacuum casting machines probably have
    never production cast before in their lives. Most of the pumps with
    those itty bitty vacuum hoses work at a bare minimum. I still teach
    flask venting because most beginning casters and students won't have
    access to stronger machines. I will try the paper liners in our
    casting class. Right now we use spru wax without any problem. 

Best Regards,
Todd Hawkinson
TR the Teacher
T.R. Hawkinson, Ltd.

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