No more trying to set workpiece reference by eye. 
Some days ago I got a nice little USB Microscope [1]. Now I can precisely zero the X and Y axis. My setup was as follows:
#1 Engrave a small point.
#2 Jog the spindle until you get the crosshair [2] centered to the mark.
#3 Enter the offset values to Settings/Camera (activate OMR first).
#4 Now you’ll get a blue button called “Set Offset”.
#5 Push it and get happy. 
[1] http://s.aliexpress.com/FbA7Vb2U
[2] Video Capture Tools
Very nice…
We need a video! Nice job.
@Chuck_Comito Here you go for part #1: https://photos.app.goo.gl/Yh8gYNOXtM7uD8QH3
And part #2: https://photos.app.goo.gl/37RQqgFHPgb7tvgj1
I have the same microscope but it tends to drift in x/y a bit when adjusting focus. I planed on using it for accurate pcb jobs with <0.1mm of precision needed. You must take all readings at a known height and focus point. Having it perfectly perpendicular to the surface and parallel to the z axis is another requirement, you can acheve that by placing a large flat mirror on the bed, the image of the scope’s lens should be dead centered.
