Delta Drill Press 11-980 Chuck Replacement: A Workshop Troubleshooting Guide

The Delta 11-980 is a benchtop press that shows up in a lot of home shops, and its chuck is a common thing to replace: worn jaws that will not grip small bits, a wobble that drills oval holes, or a chuck that drops the bit under load. A Delta drill press 11-980 chuck replacement is a straightforward job once you confirm the taper and check for a retaining screw, and the payoff is a press that drills true again for very little effort.

Replacing the chuck means separating the old chuck from the spindle and seating a new one. On the 11-980 the chuck sits on a Jacobs taper arbor, and that arbor seats in the spindle on a Morse taper. Many chucks of this type add an internal retaining screw.

The direct answer: unplug the press, check for and remove any internal retaining screw, drive the old chuck off its taper with wedges, then seat a new chuck on clean, dry tapers matched to the 11-980’s Jacobs and Morse taper. Confirm the taper by measuring before ordering a replacement.

Confirm before you buy

With the press unplugged:

• Open the jaws fully and look down the bore for a retaining set screw holding the chuck to the arbor. It is often reverse threaded, so it may loosen clockwise. Remove it first.
• Measure the arbor’s Jacobs taper. A JT33 chuck taper is common on presses this size, but measure to be sure.
• Measure the spindle’s Morse taper. Often MT2 on benchtop presses, confirmed by the arbor that fits.
• Decide chuck only or chuck and arbor. If the arbor taper is worn or scored, replace both.

Removing the old chuck

1. Open the jaws fully.
2. Slide drill chuck removal wedges into the gap between the chuck and the arbor collar, one each side.
3. Tap them evenly, alternating sides, until the chuck releases square. Support it so it does not drop.
4. To remove the arbor from the spindle, feed the quill down and drive a taper drift through the slot with a soft dead blow mallet.

Fitting the new chuck

1. Wipe both tapers bone dry. No oil on a friction fit.
2. Seat the arbor into the spindle with one firm push.
3. Seat the new chuck onto the arbor with a straight axial push against a wood block.
4. A matched replacement drill chuck with JT33 arbor sized to your measured taper takes out the guesswork.
5. Chuck a straight pin and indicate the runout with a dial indicator.

Where people go wrong

The first mistake is missing the internal retaining screw and hammering a chuck that is still bolted on. The second is ordering a chuck without confirming the taper, so the arbor will not seat. The third is oiling the taper on the new chuck, which lets it creep off under load.

The verdict

Replacing the chuck on a Delta 11-980 is a quick, rewarding repair. Unplug the press, remove any retaining screw, confirm the Jacobs and Morse taper by measuring, and pull the old chuck with wedges. Seat the new chuck on clean, dry tapers with one square push and indicate the result. Do that and this common benchtop Delta grips small bits and drills straight again, without a mismatched part or an installed wobble.

Three takeaways:

1. Remove any internal retaining screw before driving the chuck.
2. Confirm the Jacobs and Morse taper by measuring before ordering.
3. Seat the new chuck dry and square, then indicate the runout.

FAQ

How do I replace the chuck on a Delta 11-980? Unplug it, remove any internal retaining screw, drive the old chuck off with wedges, then seat a new chuck on clean, dry tapers matched to the 11-980’s Jacobs and Morse taper.

Does the 11-980 chuck have a retaining screw? Many chucks of this type do. Open the jaws fully and look down the bore. A screw at the bottom is a retaining set screw, often reverse threaded, and must come out first.

What taper does the 11-980 use? Commonly a JT33 Jacobs taper at the chuck and an MT2 Morse taper at the spindle on presses this size, but measure yours before buying a replacement.

Should I replace the arbor too? Only if the arbor taper is worn or scored. A matched chuck and arbor set covers both joints when the arbor is also worn.

Why does my new chuck wobble? Usually the taper did not seat square, often from oil on the taper or a sideways tap. Clean it dry and reseat with one straight push, then indicate.

How do I remove the old chuck? Unplug the press, remove any retaining screw, and drive the chuck off its arbor with wedges tapped evenly from both sides. Support it as it releases.

How true should the new chuck run? A few thousandths of runout is normal on a home machine. Visible wobble means reseat the taper or the arbor is worn.

References

1. Zoro Resource Hub, Morse vs. Jacobs Tapers. https://www.zoro.com/resourcehub/what-are-the-dimensions-and-angles-of-morse-tapers-and-jacobs-tapers/
2. Occupational Safety and Health Administration, Woodworking eTool: Drill Presses. https://www.osha.gov/etools/woodworking/production/machines-tools/drill-press