Re: metal spinning success

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Resonance Research Corp. by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Antonio:

I'll pass along a neat trick.

If you tig weld together or solder the halves the biggest problem is to get
a smooth surface.

Wetsand the joined pieces with dish-washing detergent using ample quantities
of the detergent.  This works even better than wet-sanding with water.  We
have used the aluminum oxide paper to do the cutting on a standard long
bench type sanding machine.

Dr. Resonance

Resonance Research Corp.
E11870 Shadylane Rd.
Baraboo,  WI  53913


 >  > hi all,
 >  >          iv just started metal spinning and have put my first attempt
on my
 >  > web page. soon i hope to be doing toroids with more practice although
its a
 >  > lot more complex than turning a half sphere
 >  > the pics at
 >  >
 >  > www.geocities-dot-com/colinheath2002/metalspinning.html
 >
 > Why the hole in the center? It's easy (after some experience...) to fix
 > the material by pressure only and make complete half spheres.
 > Take a look at my metal spinning page:
 >
 > http://www.coe.ufrj.br/~acmq/spinning
 >
 > I have used this method to make spheres and rounded disks with up to
 > ~15 cm of diameter. Presently, after getting experience with aluminum,
 > I only use copper, or better, brass. The half balls can then be soldered
 > instead of glued. To solder, I first apply some solder to the internal
 > edges of the half balls, and then mount the ball in the lathe, pressed
 > between wood blocks. I turn the lathe slowly while applying a heavy
 > soldering iron to the joint until the solder starts to leak. Some
 > polishing, and a perfect sphere is obtained.
 >
 > Antonio Carlos M. de Queiroz
 >
 >