"dpb" wrote in message
...

The point isn't the quill itself bent, it's finding a piece of hanger wire
that isn't...

Whatever error there is in it is amplified by the radius or rotation...

The idea is ok, it's the implementation that has to be good to get it to
work in practice....

--


Machinists have been doing it this way for at least 150 years. I, myself,
have done it hundreds of times (yes, I am a machinist).
It doesn't even matter if the chuck or spindle is bent, this method will get
the table perpendicular to the spindles axis of rotation.