Slipping mortise tenon

[Webb Willmott]

My old Delta drill press is acting up. The Jacob's chuck MT don't want to stay in. I'm sure somebody has run into the problem with MT's not wanting to stay in and looking for how to fix.

 

[robo hippy]

It may need to be cleaned out. I did have problems with mine not wanting to stay in a long time ago. It ended up being that the drill bit I was using was inserted too deep into the chuck, and that did not allow the morris taper to properly seat. Maybe a combination of things.

robo hippy

 

[Richard Coers]

You sure it’s a Morse taper?

 

[Gord Cameron]

- Clean the male and female parts with mineral spirits or a very light lubricant (e.g. WD-40 or Boeshield T-9), then wipe to remove as much solvent or lubricant as possible;
- Open the chuck all the way so the jaws are fully inside the nose of the chuck body and insert the morse taper in the drill press quill;
- Put a wooden block on the nose of the chuck and give the piece of wood one decent whack with a mallet.

It is a good idea to practice the motion of the whack beforehand, making sure you have room to swing the mallet: it is an awkward upward movement, and you want to get it right on the first whack.

 

[Gerald Lawrence]

Gord beat me to it . I had a Craftsman that gave me a lot of trouble and the wood and hammer were required several times over the years

 

[Steve Tiedman]

I had that happen once when the bit had a catch in whatever I was drilling (steel, maybe?). I stopped the motor, then tried to rotate the handle "upward" to retract the bit, and the chuck came right off the taper with the bit still stock in whatever I was drilling.

 

[Webb Willmott]

You sure it’s a Morse taper?

Yes

 

[Webb Willmott]

- Clean the male and female parts with mineral spirits or a very light lubricant (e.g. WD-40 or Boeshield T-9), then wipe to remove as much solvent or lubricant as possible;
- Open the chuck all the way so the jaws are fully inside the nose of the chuck body and insert the morse taper in the drill press quill;
- Put a wooden block on the nose of the chuck and give the piece of wood one decent whack with a mallet.

It is a good idea to practice the motion of the whack beforehand, making sure you have room to swing the mallet: it is an awkward upward movement, and you want to get it right on the first whack.

Should I polish the taper with some emery cloth also?