On Saturday 23 November 2013 19:38:04 Jon Elson did opine:

> Marcus Bowman wrote:
> > I have an optical machine scope that has that kind of gimbal
> > adjustment, although it is just two screws which act on a spherical
> > arrangement inside (I think). Works fine. I have also cobbled
> > together an adjustable camera mount for a USB camera, but don't use
> > it (prefer my optical scope). What would be the disadvantage of
> > mounting it permanently on the side of the head? That way it is
> > always there, and you only need to calibrate its position relative to
> > the spindle, once. You could use a work offset.
> 
> The permanent mount can't allow for different Z distance.  Putting it in
> the spindle
> allows the Z axis mechanism of your machine to make this adjustment and
> bring
> the workpiece into sharp focus.  If your machine is a knee mill with the
> Z on
> the knee, or a machine where the whole head is your Z movement, what you
> suggest is fine.  My machine has a manual knee adjustment and a quill on
> the spindle, so the fixed head camera would require moving the knee for
> camera focus.  it would still work, but might not be as convenient.
> 
> Jon

So in a sense, I'm one up on the knee mills.  My Z drive moves the whole 
maryann, something over a foot IIRC.

Cheers, Gene
-- 
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