On 10 Jul 2003 16:32:36 -0700, jim rozen wrote:
You need to be more specific about the 'critical speed'
problem.

What it means is, unless the entire shaft that protrudes
is *securely* supported along its ENTIRE length, the
machine operator will be confronted with a piece of
one inch diamter bar stock that has bent at a 90
degree angle where it emerges from the far side
of the headstock, and is WHIPPING around in
a huge circle at about 1000 rpm.

Ask me how I know. :-(

Gary