[Jewelry making - Article 00030] - Re: [Orchid] Why does my gold BOIL?

[Jeffrey Everett]

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>         I have cast over 100 grams at a shot on my ''centrifugal
>     casting machine'', if you hold a tight hot flame, use plenty of
>     flux, and don't sit on your metal keeping tiny bits in molten stage
>     then i don't agree with the theory of oxygenating the metal. I have
>     achieved many thousands of sucessful casts. Am I missin something? 


    I don't think you're missing a thing. Anything to do with melting or
    soldering is about heat control, right? The one thing I've noticed
    about casting, and I've also cast thousands of flasks, is once you've
    got a feel for it, you can break just about every rule in the book
    and still get quality castings. 

    I would like to mention though that certain alloys are very
    forgiving, especially silicon additive gold alloys which like to be
    cast hot. In my experience, high copper (non-silicon or zinc
    additive) alloys don't respond so well to a tight and hot torch. 

    Personally, I use no flux when I cast other than a glazed crucible,
    and use the coolest/softest flame I can quickly melt with. My
    technique has more to do with the particular high karat alloys I'm
    casting than general technique and undoubtedly applies to no one
    else. 

Jeffrey Everett


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