[Jewelry making - Article 00053] - Re: [Orchid] Investment casting really heavy sections

[Tim Blades]

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    In principle your advice is right , you will risk shrinkage cracking
    in the centre of your ball. I have a similar thing to do with a12mm
    ball on the end of an 8mm bangle, I am going to make an 8mm recess
    half way into the ball , this then reduces the overall thickness of
    the ball . I assume you have to fix this onto the hilt, so a deep
    hole (perhaps going all the way through) will allow the inevitable
    shrinkage to happen inside the hole. Whatever you will have to cast
    really cold maybe at about 960deg C. 

    A good way to make round wax balls on a lathe is to turn them with a
    wadding punch, just sharpen the end and use the whole circular end .
    You will have to roughly round the wax first and use a punch a bit
    smaller than the ball but it is remarkably effective. 

Tim Blades.

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