How To Repair A Jacobs Chuck

How to Fix, and Maintain, your Jacobs Super Chuck

Andrew Prestridge | December 18, 2022

When Should I Take Apart my Chuck?

If your chuck is stuck open or closed, isn't running truthful, or feels sticky or crunchy it'due south a adept time to take apart your drill chuck. Information technology may be broken and you demand to fix your Jacobs Chuck, or it's starting to wear and you don't desire it to get worse, or everything is working fine and you desire to keep information technology that fashion. Another good time is when yous first buy information technology and y'all desire to put it in tip-superlative shape before using it heavily, or maybe you're curious and desire to see how it works. Fortunately, the original design is both effective and like shooting fish in a barrel to rebuild with the right tools. For that reason, information technology hasn't inverse much since it was introduced in 1902.

Dirty Jacobs Super Chuck receiving some much needed attention

About issues with your Jacobs Chuck tin be solved with a adept make clean and lubrication. For more complicated issues, repair kits offer replacements for all the components in the Jacobs Chuck. The procedure to remove the sleeve is the same for both, and we found it takes about x minutes with our helpful Service Ring. Replacing parts, cleaning and lubrication may have longer.

Tools to Repair a Jacobs Chuck

Jacobs Chuck Service Ring, to press the sleeve on and off without damage
Arbor Printing, a dead-blow hammer can work in a pinch, merely a press is recommended
Dental pick (or similar), to scrape out any clay or buildup
Cleaning agent, most degreasers should work fine
NLGI #2 Grease, to go along everything running smoothly
Optional: A tiffin tray, to keep track of everything and stop the ball bearings from rolling abroad
Optional: Repair kit (depends on the problem)

A service ring, dental pick, and some WD-40 goes a long way to revitalizing your chuck

How to Rebuild your Jacobs Chuck

Here's a basic guide on removing and repairing your Jacobs Chuck. Cheque out the whole process in our YouTube video Rebuild a Jacobs 14N Super Chuck

Place the Jacobs Chuck (jaws facing upward) on the deep side of the Service Ring
Retract the jaws and then they're beneath the face of the chuck
Tip: If the jaws are stuck, put a slice of softer material (woods, plastic, copper, etc.) on superlative of the jaws to distribute the load
Push the face of the chuck (or soft material) downward with the press, until the sleeve slides upwards and is loose. It contains the ball bearings and then keep it in place.
Transfer the chuck to your workbench.
Remove the Service Ring, sleeve, and split-nut then use the dental pick to slide the ball bearings out of the slot in the split-nut
Remove the jaws from the face of the chuck
Tip: Marker which jaw came from which spot on the chuck
Make clean all of the components, look for anything worn or broken
Tip: The split-nut is supposed to be in two pieces
Supersede the jaws into the same holes on the chuck. If you're using new jaws (or lost rail), the holes in the chuck arbor are marked 1, 2, and 3 and match to jaws ane, two, and 3.
Tip: Expect at the threads at the base of the jaw, to determine which is which, an paradigm guide is below. The jaw tips should all marshal when they are installed in the correct order.
Apply grease to the ball begetting track, then insert the ball bearings
Tip: Adding grease kickoff helps keep the balls in identify
Make certain the jaws are all equally extended, then concord the separate-nut effectually the threads on the jaws
Keeping the jaws even, slide the sleeve over the chuck and split-nut
Identify the Jacobs Chuck (jaws facing down) on the shallow side of the Service Ring and button down with the arbor press

Check out our video on repairing a Jacobs Super Chuck here:

Jacobs Chuck Summary

Easy to Service

Maintenance is straightforward and quick to complete with a Service Band

Enduring Blueprint

The pattern has remained relatively constant since first introduced in 1902

Long Lasting

With a touch of grease and a quick clean your chuck can concluding for generations

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