Jet drill press excessive runout

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Forum topic by Billyboy posted 01-26-2009 04:14 AM 2686 views 0 times favorited 2 replies Add to Favorites Watch
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9 posts in 3375 days

01-26-2009 04:14 AM

Topic tags/keywords: drill press runout jet

I recently bought a used Jet JDP-17MF drill press off of Craigslist for 1/2 of new price. When I began to use it I thought that I noticed that the bits in the chuck wobbled a bit more than I would like.

I got out a dial indicator and found that the amount of runout varies widely depending on where I measure. Above the chuck, on the arbor, just below the bearing, the runout is about 3 to 5 thousandths. On the chuck, just above the jaws, the runout is about 5 to 8 thousandths. On a bit that is chucked in the drill the runout is about 5 to 8 thousandths at the top and as much as 2 to 3 HUNDRETHS at the bottom or cutting edge of the bit.

From this I’ve come to the conclusion that my problem is in the chuck itself, not in the quill, the arbor, or the bearings. Does this sound correct? Which parts do I need to replace in order to correct this problem?


2 replies so far

View lew's profile


12019 posts in 3722 days

#1 posted 01-26-2009 04:22 AM

Perhaps there is just dirt on the tapers portion of the quill that seats into the chuck. Pop off the chuck and clean the tapered shaft and the tapered hole and see if that makes a difference.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View marcb's profile


768 posts in 3640 days

#2 posted 01-26-2009 09:40 AM

Like lew said, could be dirt or a bad mounting.

Get the chuck off clean the taper, measure the runout on the taper then decide. If its the chuck, get a good one, not just a Jet replacement (my opinion)

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