[TheForge] copper balls

[Michael Horgan]

True, Andy... unless you have a big back yard.  Conic used to do titanium 
tanks for the Saturn V this way out back of my shop in San Diego.  Noisy, 
but fun to watch.

>>   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.

Michael D. Horgan , lughaid@earthlink.net
http://members.aol.com/lughaid/
posting from
  A BRAZEN FORGERY
Blacksmithing and Metalwork
Claremont, Ca.