But he lost a few inches of vertical space now taken up by the part of the 3/8" bolt that sticks out of the old chuck, and the length of the keyless chuck. He's also increased any runout that was already in his spindle by increasing the distance from the pivot point to the tip of the drill bit. If he wanted a keyless chuck, he could have just removed the old chuck from the DP and installed a keyless.
My flex shaft sander uses a collet and I wanted to use sanding heads from a drill chuck based system. I had a small machine shop operator thread and turn an arbor. He re-chucked (?) the assembled unit and corrected for runout. It might not be the perfect solution but $30. and a salvage chuck from an old drill as opposed to buying the additional sanding unit I thought was a good option for me.
Just measure the runout with a piece of drill-rod in the original chuck, and then the same drill-rod in the added-on chuck. It should be thousandths,yes, although I once had a 17" Jet that had so much runout you could see the bit wobbling.
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