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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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can you pour brass in a mold?
On Wed, 09 Nov 2005 07:49:54 GMT, mark
wrote: Could a person melt brass or bronze Go with bronze ("copper" loose change is good, but sort it with a magnet first) Brass has the problem of zinc boil-off, which is significant for small loadings. with a oxy welding torch Oxy-propane maybe, oxy-acetylene is too much temperature and not enough heat. Best of all is a well-insulated box kiln around the crucible and something like a Ron Reil propane-air injector burner. in a cruxible Crucibles are good, but you can get away with steel pipe and a welded end cap for your first attempts. Don't melt too little at a time, because you need to maintain temperature from the kiln to the pour. and pour it in a shallow, crude mold of plaster paris or some other material? Don't think crude, you don't have to. Lost foam in sand works (builder's insulation foam, builder's sand) So does cuttlefish bone. Plaster is mainly used as an investment around lost wax, and you might want to buy specific investment plasters for that, then follow the bake-out rules properly. Greensand moulding around a woodern pattern is worth trying, but it's easier to mould a large piece than a small piece, and easier to pour a small piece than a large piece. For one-offs, I'd use lost foam. Jarkman and I have been doing some of this lately. We're still pretty rubbish at it, but it's fun. http://www.jarkman.co.uk/catalog/fripperies/index.htm |
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