[Jewelry making - Article 00848] - Re: [Orchid] Ring shrinkage to the right size

[castaldo]

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Dear Jonathan,

    Any good zero or low-shrinkage rubber mold material will do what it
    promises to do -- produce a mold with zero or little shrinkage. 

    But that's not what you are really interested in. What you really
    want is a zero or low-shrinkage CASTING. 

    And that's not produced automatically by the simple choice of a mold
    material. 

    Casting shrinkage (as opposed to mold shrinkage) is the result of
    100's of factors introduced by the mold maker and the caster. Most
    of them are not even aware of the factors and just chalk it all up to
    "variability". Others know the factors involved but feel they cannot
    cope with them and still run a commercial operation. 

    The only answer I know of is to find a good caster, figure out his
    shrinkage rates and size your waxes to give the results you want
    using his services. At least that way you'll have eliminated many of
    the variables caused by using different casters and their different
    procedures. 

Michael Knight
Castaldo Products Mfg. Corp.
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