little chuck...

[rambin]

hmmm... there could be a bearing in there couldn't there?
The plot thickens.

no im thinking its like a jacobs taper....the one that holds your drill chuck to its arbour...its not supposed to actually turn when in use...it was turning as I had a wrench on it well it was in the vise ( I thought it was a threaded connection) I have no reason to take it apart other then a cleaning and investigation into the runout problem

 

[rambin]

well I got it cleaned up and back together didn't get a chance to put it back on the lathe and check the runout again.. Its defintaly a taper such as a Jacobs that holds it on. prbly be a few days b4 I can pull the 4jaw off and put this lil one back on to play with it again.

 

[dlane]

“it was turning as I had a wrench on it well it was in the vise“
What’s it ?

 

[rambin]

the chuck was turning on the spindle....I had the m3 end in the vise and a wrench on the chuck jaws.... I had thought it was threaded onto the spindle but apparently its a taper fit

 

[rambin]

well I cleaned it up some and tried it in the spindle again...still reading about 12 thou runout. no way to fix that as far as I can see? guess this is not much good to me either.. jaws appear to be all in right as they close tight and on center.

 

[middle.road]

.012"? dang. Something must be messed with how a PO mounted the arbor into it.
Perhaps they try to turn the mating taper to mount the arbor and didn't have it trued properly.

 

[dlane]

It looks kinda BTH.

 

[rambin]

it is beat up pretty good...... came with the lathe was hoping to get some use out of it for small pieces instead of dialing in the 4 jaw chuck all the time...but no luck...

 

[Kernbigo]

so grind the jaws in

 

[Waterlooboy2hp]

I have 2 one is union and the other is craftsman but made by union. It is a light duty chuck. The OP's chuck looks to be screwed on. Mine are 1 1/2-8 thread his is probably 1" 10 or 8 thread. I would take it off the MT arbor. make a straight arbor and chuck it in the 4 jaw and use it that way.

==============================================================
That`s pretty much what I did. Had these 2 for over 60 years. Made by Cushman in CT. and have a patent date on them of 1872. Very handy for small work and making washer like spacers. Bore the ID in one chuck and turn the OD in the other. ---- John