Today's shop work

cathead

cathead

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It's been raining here for some days and the Ferra Firma is pretty darn soggy so I was forced indoors for some shop work.

The project of the day was to disassemble, clean and reassemble a bunch of Jacobs Ball Bearing Chucks given to me.
Six of them are smooth as glass now and quite usable. The 7th one, although usable is somewhat draggy in spots so may have to
give that one another once over. Then there were the two that were run on an unattended CNC machine and the chuck heads crashed
and spun welded the jaws solid. I could not get them apart so they will have to be considered junk I guess.

The huge one all by itself was given to me and found in an old semi trailer. It was completely rusted outside but with some
sanding and polishing, it works perfectly with no disassembly. It has a #5 morse taper and the chuck is a #20 which
goes from 3/8 inch to a full inch! It will fit in my Monarch lathe head stock but really can't think of a time when I would
use it that way.

P1020561.JPG
This is the refurbished bunch with the catchy one on the left. P1020562.JPG
These were beyond repair and I couldn't even get them apart. P1020563.JPGP1020563.JPG
This is the #20 Jacobs that goes from 3/8 inch to a full inch.



All in all it has been a pretty good day considering the weather outside and the fact that I was able to have some productive shop time.
 
Nice. I've never tried, how do you take them apart?
 
They can be pressed apart and back together with a hydraulic press or large machinist vise(like a Kurt) will work too.

edit: You have to press on the business end and put support on the outer rung on the back side. You need a cylinder
with the proper hole size to catch that outer edge.
 
Last edited:
cathead said:
They can be pressed apart and back together with a hydraulic press or large machinist vise(like a Kurt) will work too.

edit: You have to press on the business end and put support on the outer rung on the back side. You need a cylinder
with the proper hole size to catch that outer edge.
Click to expand...


An added note for clarification: Begin by opening up the chuck as wide as it will go so you can press on the flat face of the business end barrel.
If you can't open the jaws, put a large socket over the jaws and press on it that way. I don't think the chuck
jaws would stand up to the pressure necessary to separate the outer sleeve.
 
Just to clarify here...

You make a tube longer than the Morse taper end to fit the outer collar. (or bore a hole in a plate) Then press the body down making sure not to put pressure on the movable jaws.

I have several chucks with a wrong, for me, Morse taper. I assume this will also press out?

The ones I have with a too large taper are also key-less chucks. I assume they work the same?

Thanks for describing this. need to put chuck upgrade to the top of my pile of stuff to do.
 
Last edited:
Karl_T said:
Just to clarify here...

You make a tube longer than the Morse taper end to fit the outer collar. (or bore a hole in a plate) Then press the body down making sure not to put pressure on the movable jaws.

I have several chucks with a wrong, for me, Morse taper. I assume this will also press out?

The ones I have with a too large taper are also key-less chucks. I assume they work the same?

Thanks for describing this. need to put chuck upgrade to the top of my pile of stuff to do.
Click to expand...



Karl,

Yes you can make a tube longer than the arbor if you need to. The arbors can be removed with a notched out shim. I make my own to fit
the application. If you remove the arbor first, you don't need much length on the cylinder. I have not disassembled any keyless chucks so can't
say anything about that.
 
Karl,

Yes you could use a hole bored in a plate if you like and press on the nose of the chuck, not the jaws and you will do just fine.

Good luck. Let me know if you have any difficulty.
 
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