Chuck fell off

[NUTTSGT]

I have a Skil 8" benchtop drill press, nothing fancy but it has worked for me. As I was using it tonight, the bit stopped spinning but I noticed the shaft still was. This looks to be a press on chuck.

Does this mean I have to take it apart and press the chuck back on the shaft ?

I'd guess make sure it's clean and maybe some loctite on it too ?

 

[ZRX61]

Morse taper? just push it back in & give it a tap with a mallet, use a piece of wood if you only have a hammer... No loctite etc needed.

 

[NUTTSGT]

I'm not sure if it's a Morse taper or not, It's not a regular Jacobs chuck. It does have a part number on it, RJ33-13L.

I know it's not the best DP out there but this thing was free when the wife worked at verizon (GTE) and got it with her earned points. The thing is like 14-15 years old.

 

[larry_g]

Before following ZRX's advise take a good look at the taper on each side. If you galled and raised some burrs then carefully stone off the high points so that the male and female parts of the taper can make good contact. If clean, dry, and smooth the tapers will lock with not to much of a tap together. Just asking but what was happening just before the separation? Was some chattering or sideloading going on? This is why you cannot Mill with a drill press. The side loading will disengage the taper.

lg
no neat sig line

 

[kmacht]

It is most likely a Jacobs 33 taper that holds it on. Just clean it and the spindle it fell off of really good, make sure no grease or any small particles of stuff is on either of them and press it back on. A tap with the hammer will seat it. Drill a few pieces of steel or something hard to make sure it is pressed on firmly and you are all set. If you put any sort of side load on a Jacobs 33 taper it tends to fall off.

Keith

 

[larry_g]

I'm not sure if it's a Morse taper or not, It's not a regular Jacobs chuck. It does have a part number on it, RJ33-13L.

I know it's not the best DP out there but this thing was free when the wife worked at verizon (GTE) and got it with her earned points. The thing is like 14-15 years old.

Probably a good bet it's a Jacobs taper as most drill presses use a jt33 taper. Your RJ33 in the part number would suggest that.

lg
no neat sig line

 

[Benji]

Tap it back on my craftsman has a taper in the chuck too.

 

[ptschram]

While I'm a fan of a drop of loc-tite, do not tap it in place.

Retract the jaws, place a block of wood on the table and gently lower the chuck against the block of wood to put it back in place.

 

[PT Doc]

Retract jaws, clean both mating surfaces very well. Place piece of wood on drill press table, and lower the handle. This will press fit the surfaces. I personally would not tap the 2 together not would I use loctite.

 

[lilredex]

Most likely it is a JT-33 taper. Both the spindle and chuck have the same taper. I like to clean the spindle up using wet/dry sandpaper backed up with a small board. 320 grit is about right, do it under power with a very light touch, after any bumps or scoring marks are removed. Should end of looking polished.

If both surfaces look clean and the chuck still wiil not stay on, you may have to resort to hand lapping them, much like valves in engines are hand lapped. Very fine lapping powder or a cleanser (Comet, Bon Ami, Ajax, etc) is used. Keep the grit to a minimum..............you don't want any in the chuck.

The chuck on my Delta DP-350 packed 'er in, so I replaced it with an imported keyless, but had to lap it to make it stay put. This one:



Uploaded with ImageShack.us

 

[Outlawmws]

retract jaws, clean both mating surfaces very well. Place piece of wood on drill press table, and lower the handle. This will press fit the surfaces. I personally would not tap the 2 together not would i use loctite.

this

 

[NUTTSGT]

Thanks for the advice guys. I'm in the process of making a mobile base for my bandsaw. I welded it together and forgot to drill the holes for the screw down feet (raise the casters off the floor).

I was drilling some 3/4" holes and was getting some chatter. I already tried to press it on by lowering the chuck on to a block of wood. Once I tried to finish the hole, at the slightest chatter, the chuck fell back off.

I do know the the chuck has stopped before while drilling, I assumed the belt was slipping on the pulley. Since this has happened, I'm wondering if the chuck wasn't spinning on the shaft and I didn't realize it. The chuck will slide easily up the shaft and maybe has a 1/16" of shaft (at the very most)left to seat on.

Reading what you guys have posted and what I can see, for now, makes me think the shaft/chuck is worn to the point it may not stay on. I suppose before anything else, I need to get the calipers out and do some measuring.

 

[lilredex]

You can check the fit by applying some layout dye to the spindle, then turning the chuck back and forth on the spindle. Where it contacts will be rubbed off. Then you can decide on how to proceed. No layout dye? Felt pen marker will also do.

 

[NUTTSGT]

The last can of layout dye I had was old and wanted to come out in a stream. So I tossed it. I'll use a trusty Sharpie, thanks for the idea.