[Jewelry making - Article 00069] - Re: [Orchid] Vent holes in rubber molds

[Cynthia Eid]

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Hi Andrew,

    I cut and injected 3 rubber molds last week---they did not fill well
    until I enlarged the sprues. That worked for me. I worked 3 years as
    the model and mold maker in a gold jewelry factory, and rarely found
    vents necessary. As an added plus, when you get the sprue right for
    wax injecting, it is likely to work well for the casting! In fact I
    received the castings today, and they look great! Hmm.....the other
    thing that I did that helped my molds fill last week was adjust the
    wax temperature. It worked better when it was hotter than the
    recommended temp. on the package. I remember that some molds seemed
    to work better with a release, such as baby powder (cornstarch is
    healthier than talc) we put it in a cotton sock, tied up the end, and
    sort of powder-puffed it on. Vents were a last resort. We usually
    burned them in, but you could cut it, or drill it, I imagine.
    Whatever works! Certainly, there is no harm in a small vent or two.
    Don't forget to let the wax cool long enough before you remove it.
    And, be sure that you have enough pressure.... Best of luck! 

Cynthia
http://www.cynthiaeid.com
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