[TheForge] copper balls

[Demon Buddha]

At 07:29 PM 9/27/2003 -0700, you wrote:

>Well, could be cast, use a sweep to make the simple sand molds.Pretty 
>heavy, though.  Could be done in one shot over a hollow die.Use an 
>annealed blank bolted to a die form. Draw a vacuum, then put at the bottom 
>of a tank, then set off an underwater explosion above it. The pressure 
>wave does a nice job of forming the blank to the die.  <grin> Your mileage 
>may vary.


         This is called hydro-forming.  Not something to be done in one's 
backyard.


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