[Jewelry making - Article 01366] - [Orchid] Casting challenge

[Rachel Silber]

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    Hi! I have a challenging situation that I hope you will be able to
    help resolve. I designed a few components which we casting some items
    in silver.  These pieces have a hole pierced through the length of
    each piece.  We are getting a lot of rejects because of investment
    breakage.  In the rubber mold, we insert a properly-sized pin which
    maintains the hole shape while the item is injected.  The pin is
    removed and the hole is still there as it should be. We build trees
    and invest them so the holes are filled with investment and the tree
    structure in wax is still there.  After burnout though - we are left
    with some really interesting little investment wands - all over the
    flask.  This makes it quite interesting during pouring of the metal
    where the little investment pieces break off and end up everywhere
    inside the flask wreaking havoc on the pieces inside. Investment
    bowling you could call it!!!   Rejection rate is understandably high!
    What I (think) I need is something to insert inside each piece so
    that there will be no investment entering the holes and causing this
    mess.  Maybe a type of compound/material that will not be affected
    during burnout and can be removed somehow after casting? Am I being
    unrealistic?  Do any of you have a suggestion? Thanks in advance!!!
    Rachel Silber www.silbers.com


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