Jacobs 6A-33 Chuck Rebuild, Parts, Options

Рет қаралды 6,647

Күн бұрын

The Jacobs 6A-33 Medium Duty Chuck was a very popular choice for makers of drill presses. Makers like Rockwell, Craftsman, Delta, Milwaukee and others installed this on their benchtop drill presses. And the 6A-33 has a large capacity range from nearly... bit.ly/35fiXHl
zero to 1/2" this chuck could handle a wide range of drill shanks. Our research into new spare parts has come up with a big zero, but with some care and effort a stuck, sticky or bit-dropping chuck can almost always be rebuilt. Some hurdles exist, but with a modest set of tools, cleaning & grease you can rebuild this chuck and enjoy they way it was intended by the original maker.
Chapters
0:00 6A-33 Jacobs Chuck
0:36 Sourcing Parts
1:49 Removing Sleeve
3:30 On the Bench
4:00 Split Nut
5:21 Cleaning
6:24 Jaws - Burr Removal & Stoning
8:25 Lube & Assembly
11:18 Press on Sleeve
11:59 Old Drill Press Example
Numbers
Jacobs 6A-33 Medium Duty Chuck Code 02067
Sleeve Kit S6
Jaws and Split Nut Kit U6
Key K3
Mounting Taper 33 JT (Jacobs Taper)
Machine Tool Arbor Range MT0-MT4
Playbook
1) Service the Chuck, take it apart, clean..., lube and reassemble.
2) Buy some NOS parts on eBay if you can find them plus #1
3) Find another 6A-33 on eBay if yours is broken, plus #1 and maybe #2
4) Replace with a similar but not Original chuck Made in USA
5) Replace with a new chuck - not a Jacobs it is mfr by DNLK amzn.to/3qhEFmr
Cost and Country
1) $5 to $49 100% made in USA plus you get your Original Chuck working again...
2) $35 to $80 100% made in USA plus you get your Original Chuck working again...
3) $35 to 150 100% made in USA plus you get your Original Chuck working again...
4) $100 to $500 0% made in USA and usually some plastic is involved
5) $55 100% made in USA - NOT ORIGINAL, have not tested
Tools Used for Rebuild
1) Service Ring evolventdesign.com/products/j...
2) Scotch Bright amzn.to/3ouzbUC
3) Grease amzn.to/3bikQXL
4) Stones amzn.to/2XqACHL
5) Dake Press amzn.to/3bgKTi2
Tech Articles
bit.ly/3pXsHOD
bit.ly/3bdfayb
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Пікірлер: 25

@PaulThomas-qo9vy 3 жыл бұрын

That's awesome! I've been around chucks all my life, went to machinist classes & never knew what was inside or how to disassemble & service them. Now I do, thanks! Stan from Shadon KTW(?) sent me to your site.

@johnhall8455 Жыл бұрын

Useful video,…it’s a good idea to let the chuck soak in white spirits for a few days to soften any hardened grease etc, and makes cleaning so much easier…if you can’t split the chuck from the arbor, you can drill through the chuck until you hit the arbor, then use a steel punch to knock them apart… I clean all the parts using a circular brush in a bench grinder, which removes any solid stuck on grease etc, then a wash in white spirits… I never use grease on any drill or lathe chucks, as it just acts as a magnet for dust and metal chips, a regular light oil like 3in one works perfectly well and in my 50 years of working with them, I’ve never had any problems, apart from having to service old chucks that have previously lubricated with all types of grease which basically eventually clogs the mechanism and prevents easy operation

@EvolventDesign Жыл бұрын

John-nice to hear from you and thanks for watching. Yes-grease does attract debris and can become the problem. Your 3in1 lubrication plan with frequent maintenance sounds like a winner. Thanks for sharing it with us all.

@T-Rex62 Жыл бұрын

Timeless information. Thank you. I just aquired a Craftsman 150 drill press with this chuck and it needed replacement. But i pressed it apart and will clean and rebuild. Saved me $$ too! Use a 1 3/4" open end wrench for my press ring.

@redcrackeroutdoors3234 Жыл бұрын

Very helpful video!!! 💪🏼💪🏼💪🏼

@EvolventDesign Жыл бұрын

Glad it was helpful!

@dannyl2598 2 жыл бұрын

Thank you. I watch a locksmith that has a little carved out tray to keep all of the parts in the correct order. Something like that for chucks would be handy for you.

@EvolventDesign 2 жыл бұрын

That's a great idea!

@travish4276 Жыл бұрын

Thanks for this video, just overhauled my same chuck as video, for my bench DP220. I have the whole DP apart for restoration. Could not get the chuck off the taper but didn't need to and just left it on the taper and disassembled it by tapping with a hammer, came apart easily. Looks like brand new now. You stuck a screwdriver and rag in there, I used a large caliber bore cleaning bristle for the jaw holes, worked like a champ!

@EvolventDesign Жыл бұрын

Very cool!

@BikeFromTheBrink 2 жыл бұрын

Very handy video, I have a 1950ish Delta DP-400 and the bit wiggles a little also the chuch was hard to turn. I followed this, I found a little burr on 1 jaw, sadly it hasn't solved the wiggle but the chuck is much easier to turn now.

@BikeFromTheBrink 2 жыл бұрын

To add, I couldn't get my chuck off so I dropped the shaft and worked it from there.

@ef2b 2 жыл бұрын

How do you remove the chuck? I tried a pair of wedges, didn't succeed, but may have been too afraid to use enough force. My machine is a Delta DP220 and looks pretty much identical to yours. Same 6A-33jt chuck. I need to find a new starter capacitor, too. Thanks for the video.

@EvolventDesign 2 жыл бұрын

There are sometimes an extra sleeve or depth control right above the chuck. Just take it off so you can clearly see where to put the wedges. Good lighting, and clean surface help you see where to attack the arbor with wedges. Also make sure the wedges are not hanging up on anything. Give it a good tap. Leave wedges in overnight and add some penetrating oil. Let me know how it goes - you are close.

@junkmaster0174 2 жыл бұрын

I have a 6A, looking for a kit, found a U6 but it only lists as fitting 6 and 6B. Does a U6 kit fit 6A anyway?

@EvolventDesign 2 жыл бұрын

Yes it will. The U6 kit contains the jaws and the nut.

@gawanee 2 жыл бұрын

Question, does the 6A-33 chuck have a hollow hole through the center of the chuck. I suspect someone has glued my chuck onto the shaft so I would like to drive the shaft out with a punch but not sure if the center of the open jaws is the tip of the shaft. Can you advise?

@EvolventDesign 2 жыл бұрын

The one that I show in this rebuild does NOT have a thru hole. You cannot go through the jaws and tap out the tapered shaft in the back. You would need to drill it out first. A good inspection with a flashlight and you should be able to see it. - Better yet, get your smartphone and take a quick video in there and you should be able to diagnose it. Good question.

@joell439 3 жыл бұрын

👍👍😎👍👍

@cd7140 2 жыл бұрын

Does anyone know what size taper this takes? (ie, jt 2-1/2)

@dannyl2598 2 жыл бұрын

I'm guessing the JT is Jacob's taper but I have never seen a 2 1/2. Most of what I see is #3. Please know that I am just a novice, not an authority by any stretch of the imagination.