I recently picked up an Atlas 12x36 lathe, and with it was a 9"
diameter 3 jaw Cushman chuck with a 2 1/4"-8 threaded backplate.
Obviously to big for the Atlas, but what machines could take this
chuck?

Thanks,

-Bruno

Bruno wrote:
I recently picked up an Atlas 12x36 lathe, and with it
was a 9" diameter 3 jaw Cushman chuck with a 2 1/4"-8
threaded backplate. Obviously too big for the Atlas, but
what machines could take this chuck?

Thanks,

-Bruno

Huh? 9 12, right?

The OP obviously means to ask what lathes (or other machines) have a
2-1/4x8 spindle that would accept the backing plate he mentions.

Dave wrote:

Bruno wrote:

I recently picked up an Atlas 12x36 lathe, and with it
was a 9" diameter 3 jaw Cushman chuck with a 2 1/4"-8
threaded backplate. Obviously too big for the Atlas, but
what machines could take this chuck?

Thanks,

-Bruno


Huh? 9 12, right?

South bend heavy 10, other southbend, Logan 11" and other logan, and other
lathes.
"Edward Greeley" wrote in message
link.net...
The OP obviously means to ask what lathes (or other machines) have a
2-1/4x8 spindle that would accept the backing plate he mentions.

Dave wrote:

Bruno wrote:

I recently picked up an Atlas 12x36 lathe, and with it
was a 9" diameter 3 jaw Cushman chuck with a 2 1/4"-8
threaded backplate. Obviously too big for the Atlas, but
what machines could take this chuck?

Thanks,

-Bruno


Huh? 9 12, right?

"Dave" wrote:

Bruno wrote:
I recently picked up an Atlas 12x36 lathe, and with it
was a 9" diameter 3 jaw Cushman chuck with a 2 1/4"-8
threaded backplate. Obviously too big for the Atlas, but
what machines could take this chuck?

Thanks,

-Bruno

Huh? 9 12, right?

Yes, 9 12, but 2 1/4" spindle 1 1/2" as found on the Atlas.

In article ,
Bruno wrote:
"Dave" wrote:

Bruno wrote:
I recently picked up an Atlas 12x36 lathe, and with it
was a 9" diameter 3 jaw Cushman chuck with a 2 1/4"-8
threaded backplate. Obviously too big for the Atlas, but
what machines could take this chuck?

Thanks,

-Bruno

Huh? 9 12, right?

Yes, 9 12, but 2 1/4" spindle 1 1/2" as found on the Atlas.

Yes -- but not all 12" lathes are made equal. My 12x24"
Clausing came with a 2-1/4x8 spindle thread. Other lathes that have
been listed by other followups also use the same spindle thread.

And essentially, I think that a 2-1/4-8 is the minimum spindle
nose which will accept a closer for 5C collets. (So does the L-00
spindle nose, with which I preplaced my 2-1/4x8 spindle, which has the
advantage that I can do serious cuts in reverse without worrying about
the chuck unscrewing from the spindle.)

Essentially, the 12" Atlas is a relatively lightweight 12" -- as
are some other Clausings which I have seen -- with a longer bed, but not
enough spindle hole to handle the 5C collets.

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

My old 13" South Bend. A pretty popular spindle size.
Don Young
"Bruno" wrote in message
...
I recently picked up an Atlas 12x36 lathe, and with it was a 9"
diameter 3 jaw Cushman chuck with a 2 1/4"-8 threaded backplate.
Obviously to big for the Atlas, but what machines could take this
chuck?

Thanks,

-Bruno