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View Full Version : two chucks on a lathe at the same time ???



Alistair Hosie
08-24-2005, 05:49 PM
I recently have been impressed with a small scrollchuck 3 jaw not a jacobs but full size chuck with a mt3 taper shank which would fit neatly in my tailstock allowing numerous possibilities has anyone tried or heard of this is it a gimmick or neat tooling accessory?Alistair

jimmstruk
08-24-2005, 05:56 PM
Hello Yes I have heard of tailstock chuck. Is it also a rollng chuck like a live center? Also didnt HSM or MW magazine have an article on such a thing recently? One can be purchased or built as a project JIM

Joel
08-24-2005, 06:00 PM
I believe what you are looking for is often called an armature chuck. You see them on eBay fairly regularly.

Timleech
08-24-2005, 06:00 PM
Are you talking about a revolving chuck or a fixed one?

I've had a revolving one for about 3 years, there was a spate of them appearing on ebay from E. Europe & I fell for one. Used it no more than three times but two of those times I'd have struggled without it. I know fixed ones exist but not sure what you would do with one?

Tim

IOWOLF
08-24-2005, 06:01 PM
Oh yes , this concept was in use at least 30 years ago, ever heare of an armature chuck?

Variations on a theme.



------------------
The tame Wolf !

aboard_epsilon
08-24-2005, 06:02 PM
trouble is i cant think of any posibilities in a lathe tailstock.
what would you do with it Alistair.
a better use for it would be in a rotary table I think....or if you could some how get it into the main chuck of your lathe ..then you could tranfer the work over for further machining on the rotary
all the best.....mark

Alistair Hosie
08-24-2005, 06:08 PM
Thanks guys mark as you know, I already have a rotary table with a built in chuck .I was thinking of between centres but as has been pointed out here,it should not be fixed but must rotate.thanks guys so far.Alistair

pistonskirt
08-24-2005, 06:15 PM
Alistair & Mark

I have seen a rolling tailstock chuck employed to part off a long piece of bar that was greater in diameter than the lathes spindle bore, a fixed steady was employed twixt the two.

regards

Brian

rockrat
08-24-2005, 07:40 PM
When I first saw your subject, I thought "Sure, I do it all of the time" But after reading your intro, I realized that I was thinking on the other plane.

I have a small 4" chuck that I will often chuck up into my larger 11" dia chuck. I use this when I don't want to change over to the collet chuck but I need to grab something small in diameter, which the larger chuck will not close down to.

But I had not thought of using a chuck like you had mentioned. All sorts of new projects now come to mind.

rock

Forrest Addy
08-24-2005, 09:27 PM
It's called a chuck center and Royal and a few other sell them at a huge price. They're easy enough to make from an old drill shank and some bearings and plate. That is, unless you want real spindle bearing performance; then you have to be fussy.

I have a 4" three jaw and a 6" 4 jaw I use for chucking on the tailstock end. I bored a 60 degree conical taper in the back of their solid solid back plates to take the live center. Works good on the rare times I need one or the other.

JS
08-24-2005, 09:33 PM
Been using mine for over 7 yrs for misc pipe from 1.5" to 12"

It is real useful to have around.

andypullen
08-25-2005, 09:32 AM
I saw this posting and thought of the Lodge and Shipley Oil Country lathe that one of my former employers had. It had a 12 1/2" bore through the spindle with a big 4 jaw chuck on each end. It was really good for large hydraulic cylinder rods and cylinders up to about 12 1/4" od.....On occasion we would have to put a table some distance from the rear chuck to support the rod we were turning.

Andy Pullen

.RC.
08-25-2005, 05:56 PM
I have had mine for a few years and find it a very handy tool to have around...I originally had a 3 jaw on it but have now put a 100mm 4 jaw on it.. It just consists of two opposed tapered roller bearings on a Mt3 arbor with a backing plate a slip fit over the bearings...

http://img.photobucket.com/albums/v606/OzRinger/P1230009.jpg

http://img.photobucket.com/albums/v606/OzRinger/starterrmotor014.jpg

Alistair Hosie
08-25-2005, 06:19 PM
Looks good ringer that's exactly the kind I am talking about Alistair

.RC.
08-25-2005, 06:31 PM
Some more pics...

http://img.photobucket.com/albums/v606/OzRinger/graderdropbox006.jpg

http://img.photobucket.com/albums/v606/OzRinger/graderdropbox007.jpg

http://img.photobucket.com/albums/v606/OzRinger/graderdropbox009.jpg