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Low-temperature white metal, brass, bronze, silver, iron? The choice of metal has a bearing on the casting techniques available. For instance, a low temperature white metal alloy might be cast in a RTV mold. Brass and silver is often lost-wax cast in plaster of paris molds.
 

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Go over to Cultman and find David Merriman's article on making the deBoer's Seaview. It has complete details on how he cast parts for his sub. There may be a second article of his with casting instructions at Cultman as well. He is the very best resource.
I don't know how essential a centrifuge is to success but I built one this summer. If you're planning on doing multiple copies, RTV made for metal casting sounds like a good investment ($75??). Now if I would only stop lurking and start casting...
 

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please be careful. ive read/heard a lot of horror stories about people who have tried this, and not survived.

heres a thought: check with a local goldsmith. they do it all the time, and while silver isnt cheap, its not outrageous either.
 
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