[Jewelry making - Article 01124] - Re: [Orchid] Large silver cups casting

[Daniel Grandi]

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    Hi Mark, I cast large items fairly frequently . When I cast an item
    like a Goblet, I usually use 1 sprue on the bottom of the stem...
    Flask temp due to the length of the item  around 1000 oF as a
    starting temp and you can go up or down from that point. 

    I would use Deox Silver from United precious metals as you would
    probably get the best results with no firescale. 

    I Torch melt my metal using either propane / Oxygen or Hydrogen
    /Oxygen depending on the situation at hand. 

    As far as Investment is concerned, I would recommend using R&R Fiber
    reinforced Investment ( available from Gesswein) 

    This material will give you extra strength for larger items and will
    probably eliminate the cracking on the inside of the cup and may
    solve a few other problems. I use this material when casting
    customers hand carved waxes  and all Large items .Have not had a
    problem casting carved waxes or large items since. 

    Use a wax debbublizer made for vacuum investing... I get mine from
    The Contenti co. 800-343-3364 . Othesr may also carry it. It is Pink
    in color and has an alcohol base so it dries quickly. Use A large
    tupperware container with a locking lid to keep the solution in and
    also to dip large items like this. Even though the Investment
    manufacturers claim that these debublizers are not neccessary.. it
    does help. Make sure the debbublizer is completely dry on the inside
    of the cup before investing or it may cause investment breakdown in
    that area. 

    These are some tips that may help... they tend to work for me. Good
    luck 

    Daniel Grandi   Racecar jewelry Co. Inc.              we do casting,
    Finishing, engraving , soldering and a host of other operations for
    people in the jewelry field. Contact : sales AT racecarjewelry.com    
    or Tel: 401-461-7803


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