[Jewelry making - Article 01114] - Re: [Orchid] Large silver cups casting

[James Binnion]

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    Mark, 	One thing I would try is lowering your flask temperature. With
    castings that large and thick as the ones you describe you should be
    able to cast at about 900F-1000F this will make for better castings.
    You ideally want as cool a flask as will fill. You may need to do
    some experiments to verify what temp is best. A lower flask
    temperature will produce better surface finish and less porosity. 

    For your bubbles you may want to try hot water investing. This has
    been used by casters at similar altitudes to Denver with some
    success. Check out http://www.preciousmetalswest.com/ they have a
    description of the process on their website. There are some folks
    who don't like this technique but it is one solution to bubble
    problems at high altitude casting shops. 

    Jim Binnion James Binnion Metal Arts Phone (360) 756-6550 Toll Free
    (877) 408 7287 Fax (360) 756-2160 http://www.mokume-gane.com
    jbin AT mokume-gane.com Member of the Better Business Bureau


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