View Full Version : Help Identify chuck

12-14-2003, 01:06 AM
This is the chuck that came with my southbend lathe.
The name stamp is pretty corroded, not legible, except for the bottom of it where it says New Britain Connecticut. I Can also make out 2 hands shaking as the logo. It is a 6" chuck, and only has 1 key hole. Unfortunetly it did not come with outside jaws or the key.

[This message has been edited by BillH (edited 12-14-2003).]

12-14-2003, 01:17 AM
The shaking hands are the Logo for Union Chuck. It was a good medium duty chuck.

12-14-2003, 01:38 AM
Thanks, Hmm, I would like a set of outside jaws for it, and the key, do you know of any suppliers?
I would hate to have to go buy a new Bison 6
" because I dont have any outside jaws for this.

12-14-2003, 10:37 AM
Replacement jaws will be difficult to find, as they are fitted to the individual chuck.
The 6" actually is a tad on the large side for that lathe, 5" three jaw is pretty typical.
You just got a good deal on a very nice lathe. Don't stint on accessories, but get good basic equipment. Bison chucks are good, or get good used on eBay or from some of the suppliers in HSM.
You might be able to use a socket drive on the chuck, or make a key of CRS and file the end square.

12-14-2003, 10:50 AM

Spend the money on a nice new chuck. Bison from Poland makes very good equipment. As JC says, 5" is good for a three jaw. When circumstances permit also buy a 4 jaw six inch.

Michael Az
12-14-2003, 01:02 PM
I have one like that in 5" that I use with my indexing head and rotary table.

12-14-2003, 01:19 PM
I just bought a 4" bison for my toy lathe, well, I suppose I will sell it, and get the 5" Bison, thank you guys. Micheal great tip on saving this chuck for a indexer, didnt think of that.
JC, thanks for suggestion on using a socket, excellent suggestion.
Evan, I will look into a good quality 4 jaw 6". I think Bison has them as well.
I'll probably buy a new 3 jaw, for the accuracy, look for a 6" 4 jaw on ebay.

12-15-2003, 01:18 AM
I've got one like that. I use it for a plow weight. http://bbs.homeshopmachinist.net//biggrin.gif

12-15-2003, 01:42 AM
Plow weight eh? The seller said that it was a 400$ chuck. Ofcourse I didnt believe him!
Perhaps it was 400$ brand new.

12-15-2003, 10:15 AM
Atlas sold a heavy duty 6" chuck in 1945 for $42.00.
The Union may approach that quality, but it is by no means a premium chuck. Invest in a good chuck.
If you are working with a budget, as most of us are, start with a 6" 4 jaw. You will need one anyway, and it will do anything a 3 jaw will and more and do it more accurately.

12-15-2003, 01:06 PM
Definetly will get a 4 jaw chuck. My skills are rather lacking in centering stock, I can allways get it to around .0015 to .002.
Perhaps I should force myself to use it for awhile to develop my skills.

Michael Az
12-15-2003, 01:33 PM
Bill, I think the thread is 1 1/2"X 8. That is a common size for indexers. I also turned out an adapter so I can use the chuck to go on my rotary table. I also have a four jaw 5"

12-15-2003, 02:15 PM
Here is a bit of info about the SB9 spindles. You should check to see just what you have.

"The standard spindle for the 9-inch Workshop lathe was bored through 0.75". The front bearing was 113/16" in diameter and 21/4" long - and the rear 13/8" in both diameter and length. However, on its introduction the spindle nose was 13/8" in diameter with a 10 tpi thread but this was quickly changed to the familiar 11/2" diameter 8 tpi U.S.F thread. The Morse taper on the original machine was a No. 3 but the advent of larger spindle nose in 1934 allowed this to be increased to a No. 4; in both cases a reducing sleeve was normally used to bring this down to a No. 2 for regular work. Owners also report examples of lathes with (8 t.p.i) spindle-thread diameters of 11/4", though this figure has yet to be found in a catalog specification.

More info may be found here: http://www.lathes.co.uk/southbend9-inch/page3.html

One slight correction to the above info, the spindle bore is bored to .77, not .75. That is so that it will readily pass .75 work.

You will need a back plate for any new chuck you buy so figure that into the cost. Looking in my KBC catalog they offer a pre-threaded (1 1/2 x 8tpi) 6" back plate for about $60 US.

12-15-2003, 03:05 PM
geez, the lathe alone zapped my budget, I need to recoupe some money before I can buy tooling. I did save a tiny bit for replacement parts though.
According to serial number, the lathe was built in 1941, the headstock has the latter oil cups on the side for the spindle, so I Think it is a safe bet that it is a standard thread.

12-15-2003, 11:03 PM
Bill - Check your email for pics of outside jaws. If these look like yours and "measure up", they're yours.


12-15-2003, 11:09 PM
Oh man, I never updated my email settings on this board, OOps.
Sorry about that, let me update it

12-15-2003, 11:18 PM
How about now?