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motorworks
09-21-2003, 09:55 PM
Found this for sale on ebay.
Not a bad idea
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http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2559980157&category=25295

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http://www.geocities.com/motorworksnf/123

G.A. Ewen
09-21-2003, 10:14 PM
Well isn't that slicker than snot! I've got to build me one of those. http://bbs.homeshopmachinist.net//cool.gif

randyc
09-22-2003, 12:14 PM
This guy is clever, makes well-designed (and good looking) tooling. Here's a ball-bearing tailstock spindle that accepts his headstock spindle chucks.

http://easyweb.easynet.co.uk/~chrish/tailspin.htm

Thrud
09-23-2003, 05:25 AM
Bison has a rotary chuck for tailstocks that is also an indexer.

I have 3-1/2" Bison chuck mounted on a MT#2 for holding reamers and larger drill bits. Use it on the Mill and Horizontal table too. I have been planning on a BB tail stock shank for my chucks ever since I seen one (Village Press books or Model Engineer - can't remember which).

Jerry B
09-23-2003, 04:20 PM
Aren't these things called "cat heads"? Or am I thinking of something else?

Arcane
09-23-2003, 11:48 PM
I bought an old, neglected 9 inch Atlas and it came with, in addition to the standard 3 jaw and 4 jaw chucks, a little 3 1/4 inch chuck (with rollers fixed to the jaws) that slid over the tailstock shaft and was secured by a set screw. It is stamped 2035 1 - 18 (serial #? and inside diameter of 1 1/8 inches) and also has the name IPMCO stamped on the face. It uses a rotating collar to close the 3 jaws. The Atlas also came with a 6 inch Buck set-true style chuck with a serial #(?) 3634. I fixed up the old girl to the best of my ability and made a few new parts for it. With a fresh coat of grey and black paint she was a pretty little gal and she found a new home with a friend of mine, who was pleased as punch to have her since the first lathe he had when he was a kid was an Atlas. I didn`t make any money on the deal, but I did gain two nice chucks!

randyc
09-24-2003, 12:16 AM
Jerry B:

I recall seeing a cat head being used on a rifle barrel. Purpose is to allow irregular shaped, tapered, rough and otherwise unsuitable workpieces to be supported by a steady rest.

Clamps over the workpiece and has adjustment screws for centering. The OD of the cat head rides in the steady.

Randy

CCWKen
09-24-2003, 01:45 AM
Dang! That is a good idea. If you're going to make one, how would you get the placement of the bearings dead on? Wouldn't be much good if they're off (in a 3-jaw).

Oh, wait. How about spinning it in the headstock and letting a tool just graze the top of the jaws. (Jaws clamped down on something) That way, as long as you drilled and taped along the arc it should be on.... Right? Has anyone tried to drill and tap chuck jaws? That sounds like a bummer.

Evan
09-24-2003, 02:16 AM
Could be a soft jaw chuck.