[Jewelry making - Article 00824] - Re: [Orchid] Purchasing vacuum wax injector

[Franklin Cox]

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Hello Ted

    I inject moulds of a similar size to the one that is giving you
    trouble. Here are a couple of things that I have learned. 

    Wax too hot is as much trouble as wax too cool. The very fluid wax
    appears to not have enough density to push the air out into the
    vents. Try starting with a cold injector and inject the molds as it
    warms up. This will give you are variety of samples of temperature
    and you might find one that is better. Although not always a good
    idea, you can try using a dusting of talcum powder for these molds.
    Work the talc into the vents. Blow away any excess. The talc will
    hold the vents open a little and allow air to pass through them
    better. 

    If the mold is cold the wax will cool too quickly on the surface of
    the rubber and  not fill completely. Try warming the mold a little.
    I do this by setting a cloth on top of the wax injector and then the
    mold on top of it. Do not let it get hot, that is harmful to the
    rubber. Do get it noticeably warmer than room temperature. 

    Increase the air pressure that you use for this mold. I will often
    use about 12 lb of pressure. 

    Different waxes of course will behave differently and you way want
    to try a wax for filigree type of models. 

    I have overcome the problem that you are experiencing by using all
    of the above and am happily using my 25 year old injector. 

Good luck
Franklin

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