[Jewelry making - Article 00952] - Re: [Orchid] Vacuum casting seal problem

[Greg DeMark]

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    If you are using a table top vacuum caster and not one that allows
    you to drop the flask down into the machine you may want to try this
    as a possible solution. 

    First do not fill the flask even to the top ( actually bottom) with
    investment. Leave about 1/4 inch without investment. This will allow
    the vacuum to seal better. 

    If you are casting large flasks and you are not getting complete
    fills on your castings you can try adding some sprue tunnels that
    are open at the bottom of the flask. To do this add a few pieces of
    wax rod into the flask from the bottom and leave it over hang the
    bottom.  Make sure you attach it to the edge of the flask so it
    doesn't move when you fill it with investment.  Also make sure that
    you do not have it touching any of your wax models and try to keep
    it as far away from them as possible ( at least 1/2 inch ). Run the
    wax rod approximately 1/3 to 1/2 way into the flask.  Use two to
    three rods. 

    This along with not filling the flask level will allow you to get a
    better vacuum and pull. 

Good Luck
Greg DeMark
email: greg AT demarkjewelry.com
Website: www.demarkjewelry.com
Custom Jewelry - Handmade Jewelry - Antique Jewelry

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