On Sun, 25 May 2008 02:44:56 +0000, Jim Chandler wrote:

Karl Townsend wrote:
Most likely, you're dealing with part deflection. It bends away from
the cutter, making it larger the further from the chuck,

Very finely sharpenned and honed tooling helps a lot with this issue.
if you've got it, super high RPM and a light finishing cut help too.

Karl



Thanks, Karl. I'll give that a try. I hadn't thought about deflection
because I thought everything was solid.

Jim

Zero deflection, eh.

It's amazing just how elusive 'zero' can be when you start looking hard
enough.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html