Never thought about it before but noticed that when testing the runout on my spindle I got varying values. Apparently there is a correct amount of torque required to hold a bit in the spindle and by over tightening you increase runout and slowly damage the spindle and collets by deforming the metal. Now that only snug the collet nut up I have more consistent results with less measured runout.
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At the day job, we tighten our collets with a torque wrench set to 90lbs. Those are ER30 cones with ATC built into the spindle. Here at the house, I tighten my ER16 collets by feel, and I’ve learned to be gentle and consistent instead of strong. Scary to not tighten hard, but yes, firm is enough.
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