Think prop spinner for a model airplane.

Assuming that I'm not making it out of spun metal, the obvious way to
proceed is to turn the outside (or inside), then flip the thing over and
turn the inside (or outside). Turning the first side is obvious -- but
how to hold the work to do the opposite side? Turn the inside, then
turn the base of the outside, then make a mandrel that holds the base
while I finish turning the nose piece?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html