Maybe "critical speed" from Machinery's Handbook or "loose" from Murphy's
text.

Hul

Wild_Bill wrote:
That could've been it, Ned, but I don't remember.

Someone else had asked if nutation could be the term, which is mentioned in
the definition of precession.

In the example of the shaft in the lightly worn bearing, the true centerline
of the shaft begins to orbit, but not smoothly, hence the chatter-like
noise.

--
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html


"Ned Simmons" wrote in message
...
On Mon, 20 Jul 2009 14:32:54 -0400, "Wild_Bill"
wrote:

I remember a discussion quite a while ago in RCM, and a term being
mentioned
that is the name for this condition, but I can't remember it (or find it
in
my saved posts).

When the bearing and or shaft contact surfaces get to a point of wear, the
shaft no longer spins around it's center axis, but instead, starts this
chatter as it rattles it's way around the inside circumference of the
bearing.

Hopefully, someone will know this term, Thanks,

Precession?

--
Ned Simmons