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?
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.
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.
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.
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.
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.
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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