Jacobs Chuck Slipping on Morse Taper

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Forum topic by Alan S posted 08-08-2011 05:22 AM 4103 views 0 times favorited 5 replies Add to Favorites Watch
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Alan S

181 posts in 3342 days

08-08-2011 05:22 AM

Topic tags/keywords: turning

I bought a harbor freight jacobs chuck for my lathe. It worked pretty well until tonight. I was using the chuck to hold a mandrel for a bottle stopper blank. The chuck slipped off the taper and after a few times of just jamming it back on, I realized that it came with a bunch of grease at the interface of the chuck and the taper. I wiped off all the grease and that made things much worse. It really won’t stay on now. Is this just a poorly made tool from harbor freight? I’ve never heard of needing grease at this interface. What should I do? Thanks!


5 replies so far

View lew's profile


12102 posts in 3781 days

#1 posted 08-08-2011 04:16 PM

When you cleaned the the taper and the chuck, nothing got stuck in the chuck hole to prevent it from seating completely, did it?

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

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Alan S

181 posts in 3342 days

#2 posted 08-08-2011 04:36 PM

No, it seats on there fine. I’m wondering if I am trying to use the chuck for something it’s not meant for. With drilling, there will be a force pushing the chuck onto the taper and also a rotational force. What I am doing using it to hold stock on the lathe is putting lateral force across it that tends to rotate the chuck off the taper. Not rotating like with drilling but pushing across the chuck. I wouldn’t know how else to hold this mandrel except with a jacob’s chuck.


View reggiek's profile


2240 posts in 3295 days

#3 posted 08-08-2011 04:52 PM

I keep a rubber hammer around for just such emergencies….iit is a dead blow vaughan I got on sale at the borg….it will set the morse taper quite well in only a single hit….this has been working for me for a long time.

-- Woodworking.....My small slice of heaven!

View DonFaulk0517's profile


131 posts in 3511 days

#4 posted 08-09-2011 02:49 AM

I have had my drill chuck slip and come off while turning bottle stoppers… not all the time, but a few. I’ve gotten in the habit of “snugging up” the chuck every once in awhile. Sanding loosens it mostly… need to make sure it is snugged up constantly. I got my drill chuck (with #2 Morse Taper) from Craft Supplies USA (for bottle stoppers). If you find a root cause… let me know!


View hairy's profile


2718 posts in 3557 days

#5 posted 08-09-2011 03:11 AM

It’s a friction fit, lube won’t help here.

Hold a straightedge up against it and check for gaps. It shouldn’t have much.

Try another Morse taper, maybe the headstock end is worn.

Tap it in to seat it, don’t beat it in.

Here's some tips. Thanks Capn. Eddie!

-- My reality check bounced...

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