![]() If the inside of the chuck receiver shows wear so close to the bottom that you cannot ascertain any distance between the wear marks and the bottom, the chuck may be bottoming instead of tightening on the taper correctly. Check the dept by looking inside at the wear marks. I would not use paper beyond 320 and use a light oil such as kerosene or diesel oil rather than water. If it is necessary to san these pieces, use a very fine wet or dry paper. ![]() To fit correctly the taper must be correct on both parts and they need to be clean and lightly oiled. Additionally a mismatch of depth will also cause a poor fit. The tiniest bloom of rust will cause this. While roughing up with sandpaper might work, but the usual problem that causes a chuck to fall off is a mismatched taper or either the chuck or the spindle has a dirty surface. SOURCE: Chuck keeps falling off drill press
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