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The way you clocked up on the quill is a pretty bad way of doing it. A better way is to get yourself a bit of rod about 6" long, put 90deg bend on each end in oppisite directions. Then attach your indicator on one end and hold the other in the chuck (you can buy something simlar but its easyer to make). Take the mill out of gear and swing the indicator around on the bed 180deg checking the dial stays the same.
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I could mount the rod that the dial indicator is on directly to a chuck. But why do I want to swing the head back and forth? Can't I just move the x and y axis through their travel to check that the bed is square to the head?
Thanks