Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.
It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep. Dimensions
from memory/guesswork. Does this sound familiar? What's it good for?
--
- -
Rex Burkheimer
WM Automotive
Fort Worth TX

Rex B wrote:

Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.
It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep. Dimensions
from memory/guesswork. Does this sound familiar? What's it good for?

Keyway in it? Probably a L-00 taper. See the URL:
http://www.toolingsystems.com/cushman/manual/page5.html

GWE

Grant Erwin wrote:
Rex B wrote:

Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.
It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep.
Dimensions from memory/guesswork. Does this sound familiar? What's
it good for?


Keyway in it? Probably a L-00 taper. See the URL:
http://www.toolingsystems.com/cushman/manual/page5.html

Pretty certain there is no keyway, but there is a 5/16-18 allen head set
screw. Hard to tell by the diagram.

On Fri, 03 Jun 2005 09:35:11 -0500, Rex B wrote:

Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.
It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep. Dimensions
from memory/guesswork. Does this sound familiar? What's it good for?

Does it have OD threads and a .250 or so sized female keyway inside
the taper?

If so, its an L0 or L00

Gunner

"Pax Americana is a philosophy. Hardly an empire.
Making sure other people play nice and dont kill each other (and us)
off in job lots is hardly empire building, particularly when you give
them self determination under "play nice" rules.

Think of it as having your older brother knock the **** out of you
for torturing the cat." Gunner

If no keyway and the set screw enters the bore of the taper this sounds
like it may be for a hardinge. Picture of the spindle nose on this page
http://www.lathes.co.uk/hardinge/index.html


Rex B wrote:

Grant Erwin wrote:

Rex B wrote:

Amongst the tooling that came with a lathe is a small 3-jaw, about
6" diameter. The mounting method on the backplate is not one I
recognize. It's a bell-mouthed taper about 2.5" in diameter, getting
slightly narrower at the bottom of the hole, which is about 1.5"
deep. Dimensions from memory/guesswork. Does this sound familiar?
What's it good for?



Keyway in it? Probably a L-00 taper. See the URL:
http://www.toolingsystems.com/cushman/manual/page5.html


Pretty certain there is no keyway, but there is a 5/16-18 allen head
set screw. Hard to tell by the diagram.

In article , Rex B "" wrote:
Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.

The mounting of the chuck on the backplate, or the mounting of
the backplate on the lathe spindle?

It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep. Dimensions
from memory/guesswork. Does this sound familiar? What's it good for?

As others have already mentioned, it sounds like a L-00, such as
I have on my Clausing. It *should* have a key slot, perhaps 3/8" wide,
in it to engage a key mounted by Allen head cap screws into a similar
key slot in the spindle nose. (A quick check through the 25th edition
of _Machinery's Handbook_ shows no hint of it in the chapter on tapers --
perhaps it is hiding somewhere else.

If it is an L-00 -- there should also be a large male thread
surrounding the socket, which mates with a female threaded ring loose
around the spindle, which is used to draw the backplate firmly onto the
taper. The spindle, of course, has a step to keep the ring from moving
too far forward.

L-00 sounds like a good bet for a 6" 3-jaw chuck, as it is
common on a 12" lathe. 4-jaw chucks tend to be larger on a 12" lathe,
say 8-10".

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 ---

On Fri, 03 Jun 2005 11:07:06 -0500, Rex B wrote:

Grant Erwin wrote:
Rex B wrote:

Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.
It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep.
Dimensions from memory/guesswork. Does this sound familiar? What's
it good for?


Keyway in it? Probably a L-00 taper. See the URL:
http://www.toolingsystems.com/cushman/manual/page5.html

Pretty certain there is no keyway, but there is a 5/16-18 allen head set
screw. Hard to tell by the diagram.


Hummmm I wonder...could it be Rivett?

Gunner

"Considering the events of recent years,
the world has a long way to go to regain
its credibility and reputation with the US."
unknown

On 3 Jun 2005 22:23:28 -0400, (DoN. Nichols)
wrote:

In article , Rex B "" wrote:
Amongst the tooling that came with a lathe is a small 3-jaw, about 6"
diameter. The mounting method on the backplate is not one I recognize.

The mounting of the chuck on the backplate, or the mounting of
the backplate on the lathe spindle?

It's a bell-mouthed taper about 2.5" in diameter, getting slightly
narrower at the bottom of the hole, which is about 1.5" deep. Dimensions
from memory/guesswork. Does this sound familiar? What's it good for?


Im sorry..I missed that 1.5" deep part. Yes, I think that it may be
Hardinge. They are rather shallow compared to L0. Or possible Rivett.
Ill have to go check one of my Hardinge back plates. I do have the 4'
cam lock types on both Hardinge lathes.
Ill also check the Rivett.
http://home.lightspeed.net/~gunner/myshop/rivett2.JPG

Gunner


As others have already mentioned, it sounds like a L-00, such as
I have on my Clausing. It *should* have a key slot, perhaps 3/8" wide,
in it to engage a key mounted by Allen head cap screws into a similar
key slot in the spindle nose. (A quick check through the 25th edition
of _Machinery's Handbook_ shows no hint of it in the chapter on tapers --
perhaps it is hiding somewhere else.

If it is an L-00 -- there should also be a large male thread
surrounding the socket, which mates with a female threaded ring loose
around the spindle, which is used to draw the backplate firmly onto the
taper. The spindle, of course, has a step to keep the ring from moving
too far forward.

L-00 sounds like a good bet for a 6" 3-jaw chuck, as it is
common on a 12" lathe. 4-jaw chucks tend to be larger on a 12" lathe,
say 8-10".

Enjoy,
DoN.

"Considering the events of recent years,
the world has a long way to go to regain
its credibility and reputation with the US."
unknown