Another thing you could do is to check how square the DP spindle is to the DP table is to chuck a 90° rod & attach an indicator to the horizontal arm of the rod. With the chuck in the full up position sweep the table & mark the readings at 90° increments, i.e. 12/3/6/9 o'clock positions, on the table. Then extend the spindle fully down & repeat. Compare the readings & adjust the head accordingly.
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