On Thu, 26 Nov 2009 18:28:28 -0800, Gunner Asch
wrote:

On Thu, 26 Nov 2009 23:19:02 +0000, Mark Rand
wrote:


So, assuming the mandrel heats up more rapidly than the headstock casting,
it'll get loose before regaining equilibrium. I don't know how good a fit the
rear outer race is in the headstock, but one must assume that it's free enough
to move before the bearing takes harm. There is no preload spring or similar
shown in the parts diagrams.

When the spindle gets hot..it expands and presses the bearings
harder..not softer.


Have I got it bass ackwards?

I had assumed that the bearings were arranged:-

====


Although, thinking about it.

Given that these are non-separable bearings, rather than fall-apart magneto
type, expansion in the "loosening" direction would still serve to tighten
things up until the point where the bearings broke...and that ain't going to
happen.

Mark Rand
RTFM