I have a 21-100 rockwell mill built in 1965 and I think I would like to add a DRO. I really only need the two horizontal axis, but 3 axis would be fine. The table travel is:
I do not necessarily need to be able to calculate bolt patterns or do any other math with the DRO. I am mostly looking for postion and the ability to tare to zero at a position. I would like +/-0.0005" but would consider +/-0.001"