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Thread: Best material for a lost wax mold?

  1. #11
    Moderator DavidF's Avatar
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    One thing I can tell you is that aluminum does not have much weight to it which makes it difficult to force the air out of the mold and get a complete fill. You could use a bottom up spruing method so the cavity fills at the bottom and vents out the top, but I would highly recommend you build yourself a vacuum assist chamber like I use in my videos.
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  2. #12
    Every metal caster needs one of these. With a 20% off coupon, it's the best deal out there!

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  3. #13
    Hi Jayboy,

    One thing I've been trying to figure out is how to make the ceramic molds such that I can get more that just one pour out of them. I can see where that would not work for the sculpture you did in that video, but the ones I'm working on now would lend themselves to being cut to a two part mold. Is that something you can do with a ceramic mold or must it always be destroyed when breaking out the metal sculpture.

    Thanks,

    Arthur

  4. #14
    Sorry Art. One time use for any ceramic mold be it shell, solid block investment or solid satincast flask investment setup. There is a certain bonding thing that happens with molten metal to ceramic materials. It's just the way it is as far as I know. The shell stuff I use really is pretty cheap. If I had to guess, that anchor probably used less than 10bucks worth of materials.
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  5. #15
    Thanks Jay!

    Now I can stop banging my head against the wall trying to figure it out!

    Arthur

  6. #16
    Only way to get a "permanent" mold is die casting. That brings in it's own set of challenges and limitations. If high detail is what you need, your stick with a one time use mold.

    CBB

  7. #17
    Senior Member Tobho Mott's Avatar
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    That, or one could use a low temp alloy like pewter, which can be poured into reusable vulcanized rubber molds that would be destroyed by higher temperatures. One of our members, Talespinner, sculpts tiny little gaming miniatures which eventually end up being cast in pewter using spinning wheel-shaped rubber molds with the sprue located at the "axle", and those molds last for many castings before they begin to degrade and have to be remade from a master.

    Jeff
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  8. #18
    Senior Member TRYPHON974's Avatar
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    If you want to cast aluminum, bronze or brass, forget the permanent molds.
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