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Chuck keeps falling off drill press

It is a tapered chuck and it falls off as I am drilling. How do I keep it on

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  • outwolunch Mar 25, 2009

    Brand new Delta DP300l drill press. Chuck does not stay on at all. Have tapped it pretty good with rubber mallet and with block n hammer. No luck.


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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. The tiniest bloom of rust will cause this. Additionally a mismatch of depth will also cause a poor fit. To fit correctly the taper must be correct on both parts and they need to be clean and lightly oiled.

If it is necessary to san these pieces, use a very fine wet or dry paper. I would not use paper beyond 320 and use a light oil such as kerosene or diesel oil rather than water. Check the dept by looking inside at the wear marks. 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. You can easily check it with some fine shim material or perhaps three to five thickness of aluminum foil. Cut five thicknesses to fit in the bottom of the chuck (not all chucks have actual bottoms and go clear through) but not on the walls that are tapered. Reinstall, and remove. Is the aluminum foil damaged/show contact marks? If so, did the chuck go on all the way and come off more easily? If so, the problem is bottoming. Bottoming is quite rare but can happen when different than spec chucks are used.

You might also examine the surfaces of both. They should look pristine with no scratches and marks. If not, that could also be the problem. A correct taper fit is difficult to spin, or remove during normal drilling operations.

Good luck!

Posted on Jan 04, 2010

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I have a rubber malet next to my drill press. When i change out chucks,I move the table to the side and take a good swing at the chuck to seat it good. If that doesnt work try roughing up the shaft with some sand paper and try to rough up the inside of the chuck with sandpaper or a small wire brush. Good luck.

Posted on Jan 18, 2009

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