Drill chuck disasembly

[Lew Hartswick]

Have a Jacobs clone (at least it dosent have a name on it) 1/2 " that the
gear teeth are wrecked so was going to take it apart to see the innards.
Can't find how it comes apart.
Markings on it are as follows:
A sort of fat delta (Mazada engine rotor) RJ3-16L
That's all it says.
Does the "barell seperate or does it press off and if so how to support it etc. ?
Thanks for any ideas.
...lew...

[Mark Hockett]

Lew,
Heres a site with some instructions,
http://www.beautifuliron.com/jacobs.htm

[CCWKen]

If it's a ball bearing chuck, watch for the bearing port during the press. If you're not careful, you'll be be chasing your balls around the shop floor.

[Todd Tolhurst]

I hate it when that happens.

[BadDog]

Hehe, yeah, that was fun...

But later chucks, at least the Jacob Super Chucks, have caged bearings rather than loose.

[CCWKen]

I wouldn't know about that. My stuff is a little obsolete.

[darryl]

So---how does a keyless chuck come apart? Press the sleeve off, same as ordinary chuck?

[BadDog]

Nope, they have an outer shell that screws off the body.

[Mark Hockett]

In my shop I have 12 Jacobs ball bearing chucks. Some of them were purchased used and the jaws are a little chewed up. I wanted to put new jaws in them so I called my industrial supplier and got a price. They only sell rebuild kits for the ball bearing chucks and the price was $115.00 for the 1/2" chucks. At that price I can buy two import ball bearing chucks. Enco's sale price on new Jacobs’s ball bearing chucks is very close to that price. I don't think I will be purchasing any more Jacobs ball bearing chucks for my shop because of the cost to rebuild. I can put new jaws in my Albrecht chucks for $45.00 and it takes less than 10 minutes. Albrecht chucks are very simple to disassemble.

I am not a big fan of the keyless chucks when being used on my CNC mills, the spindle has a brake that stops the spindle so fast the chucks can open up. I think my next chuck purchase will be an Albrecht key type chuck. They use a T-handle type Allen wrench to tighten and are rock solid and dead true when tight.

[A.K. Boomer]

I wouldn't know about that. My stuff is a little obsolete.

WOW, that thing is in great shape, nice knurling too, for 1902 or any era for that matter.