- Jan 29, 2015
A slight variation on this that works very well is to setup the dial gauge indicator then rotate the chuck 360 degrees by hand. As it rotates make a note of the minimum and maximum needle movement then average them, if the minimum is 0 and the maximum is 0.8 then the average is 0.4. Now rotate so the indicator lines up with the jaws and using two keys adjust until the indicator shows 0.4, now rotate 90% and repeat. In less than two whole turns on the chuck the work is perfectly centred.