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Delta 11-990 drill press. Chuck won’t stay on?

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Forum topic by SweetTea posted 07-15-2018 01:31 PM 799 views 0 times favorited 8 replies Add to Favorites Watch
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SweetTea

362 posts in 808 days


07-15-2018 01:31 PM

I am having trouble with my Delta 11-990 drill press and was hoping some of you guys could help me find a fix. I use a Blum attachment that is mounted on my drill press that bores hinge holes for cabinet doors. The problem that I am having is that the chuck won’t stay on the shaft. I try and press it back on and it comes right back off. I know that the Blum attachment adds weight and downward force on the chuck. But I am not sure what I should do? Any suggestions?


8 replies so far

View Bill White's profile

Bill White

5072 posts in 4109 days


#1 posted 07-15-2018 02:13 PM

Are the tapers (ID and OD) clean and burr-free?

-- bill@magraphics.us

View SweetTea's profile

SweetTea

362 posts in 808 days


#2 posted 07-15-2018 05:11 PM



Are the tapers (ID and OD) clean and burr-free?

- Bill White

As far as I can see they are. I have tried to wipe them out and they still won’t stay.

View MrRon's profile

MrRon

5089 posts in 3392 days


#3 posted 07-15-2018 05:41 PM

I had the same problem with a tapping attachment in my drill press. The taper usually used in small DP’s is a #33. It is a self holding taper which means, under normal use, will stay seated on the tapered shaft without falling off. It is the downward pressure of drilling that keeps the chuck on the shaft. Any weight placed on the chuck will tend to loosen it’s grip on the shaft. There is no way you can prevent this other than securing the chuck to the shaft with an epoxy or welding.

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MrRon

5089 posts in 3392 days


#4 posted 07-15-2018 05:53 PM

I had the same problem with a tapping attachment in my drill press. The taper usually used in small DP’s is a #33. It is a self holding taper which means, under normal use, will stay seated on the tapered shaft without falling off. It is the downward pressure of drilling that keeps the chuck on the shaft. Any weight placed on the chuck will tend to loosen it’s grip on the shaft. There is no way you can prevent this other than securing the chuck to the shaft with an epoxy or welding.

View BuffaloBrewer's profile

BuffaloBrewer

59 posts in 967 days


#5 posted 07-15-2018 06:18 PM

I had this problem with a craftsman drill press. I wiped the shaft and inside of the chuck down with a solvent. It wouldn’t stay on. Next I warmed up the chuck in the oven (very low temperature) and pressed it back on. The chuck has been on for a year.

View DDWW's profile

DDWW

90 posts in 775 days


#6 posted 07-15-2018 06:48 PM

I don’t think there is anything wrong with your drill.

I think the problem is defiantly the weight of the blum and the smaller size of the shaft and chuck. Those things you can’t change. Don’t have one but maybe you could put a wedge under the blum to remove some the downward pressure.

I had a similar issue on another drill press from Taiwan. I used valve lapping paste (Versachem 13209 Metal Grinding Compound ) to make sure they had a perfect fit. This might make it a problem to replace the chuck in the future. I was lapping a JT6 to a JT 2 1/2 a size no longer used or listed, but extremely close to the 6.

I think BuffaloBrewers solution is non destructive and would work as well, I’d use 150 degrees or so to heat it and tap it on with a rubber mallet it will tighten as it cools.

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wichman3

73 posts in 769 days


#7 posted 07-15-2018 07:08 PM

I had this problem on my inexpensive full size drill press, any side pressure on the shaft and it would fall off (drum sanding) after many other “solutions” I used the weakest threadlocker I could find at the time (20+ yrs ago) hasn’t come off since.

View SweetTea's profile

SweetTea

362 posts in 808 days


#8 posted 07-16-2018 12:55 PM

What type of threadlockrr or locktight should I try if the heat doesn’t work? I know that if I put any type of adhesive on it that it might not come back off in the future, but this is an old worn out unit and I don’t mind if it comes off in the future or not. I just need something to get me by until I can get a real hinge boring machine

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