Jon thanks for the reply. I’ve played with every variable I can think of. I can set it up for the X axis to show a diameter reduction no problem. I suppose I’m a little disappointed I can’t get better resolution than 10 micron on the diameter, after all a DRO is partly there to encourage us to reach to tighter tolerances, despite the fact that the machine or in this case, operator, might not be up to the task.
However on reflection that’s a very small amount! On the odd occasion I may need better resolution I could set up a dial indicator off the cross slide, or use the compound to shave a whisker off.