I am working now on parts where I need better.  The jig I showed a couple days ago left the two ends of the workpiece about  .03" difference from the Jawa of the vise.  Since I am trying to make a part in which I may cut degree marker lines,  this is not good 
The tapped holes in the Delrin vertical ba/base were not terribly lined up.  So I turned the part over and went a but more careful.  Moving the edge finder along the edge of that piece revealed that it was not parallel to the X-axis.  Why?  The rear of the vise was not parallel to the mill table.  I loosened the clamps, lined them up as best as I could feel (which usually means +-.003"), then clamped everything down again.
After drilling and tapping, the two ends are about .001" from parallel which is good enough.  This gobbled up lots of time.   But when I cut the workpiece,  it will be plenty accurate. 
 
 
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