On Wed, 02 Dec 2009 10:06:04 -0600, dpb wrote:

J. Clarke wrote:
...

The whole IDEA is to bend the frigging wire so that when you spin the chuck
is traces out a circle in space that is perpendicular to the quill--you then
align the table to that circle.

Indeed, which is what I've said...

_IF_ that circle is rotating slightly off-axis, the length of the wire
to the point amplifies that and you align the table to it...

It relies for accuracy on the axis of rotation being colinear w/ the
quill precisely...

This method won't measure runout or even that the quill is parallel
(much less collinear) to the axis of rotation, only that the plane of
the table is perpendicular to the axis of rotation.