We use a tool called an edge finder. This is a little tool which you put in the spindle (chuck) and run maybe 500 rpm. Then you carefully jog the machine until the tip approaches the workpiece. Keep jogging....in Bandit low jog, each push of the button is .001" and when the tip of the edge finder actually touches the part, it will jump a little bit sideways to show you that there is no longer room for the tip to rotate concentric with the spindle. The tip is springloaded, that is how this is possible. So, whatever the radius of the edge finder is, that is how far the spindle remains from the true edge of the part. Allow for that and you will be right on the edge. In Bandit, Hi jog is .1", so you will find an edge finder with a .2" dia tip to be most convenient to get the machine right on the edge with one push of an axis key in Hi jog.
This does not apply to the Z axis.
Sorry to hear about no displays. Nonetheless, if you practice with care the instructions I gave you, you can still play with it until you understand what is going on.
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