I picked up a jet 12x40 bench lathe today. It was manufactured in 1983.
It appears to be in fairly good shape however the chuck and backing plate is
missing on this lathe. It did come with turning plate. My problem is that I
have an 8" chuck and backing plate with a 2 1/4"x8 mounting hole but it
doesn't go on the jet. It appears the jet is a 2 3/8" hole but it is an 8
thread where as all the backing plates I've been able to locate in 2 3/8ths"
are a 6 thread. Is there anyone on this forum who has had any experience
with these backing plates or have any idea where to acquire one?
Thanks,
Dick


--
Richard H. Neighbors
Building fine pool cues for real pool players at affordable prices.
Over 35 years experience in cue repair.
318 Linden st.
Cinti. OH 45216
ph# 513 233-7499
web site: http//www.dickiecues.com

rhncue wrote:
I picked up a jet 12x40 bench lathe today. It was manufactured in 1983.
It appears to be in fairly good shape however the chuck and backing plate is
missing on this lathe. It did come with turning plate. My problem is that I
have an 8" chuck and backing plate with a 2 1/4"x8 mounting hole but it
doesn't go on the jet. It appears the jet is a 2 3/8" hole but it is an 8
thread where as all the backing plates I've been able to locate in 2 3/8ths"
are a 6 thread. Is there anyone on this forum who has had any experience
with these backing plates or have any idea where to acquire one?

Sounds like an easy turning job to me, enlarging a 2 1/4" x 8 backing
plate to 2 3/8" x 8--all you need is a metal-turning lathe with
threading capabilities, and a faceplate.

Ken Grunke

--
take da "ma" offa dot com fer eemayl

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In article ,
Ken Grunke wrote:
rhncue wrote:
I picked up a jet 12x40 bench lathe today. It was manufactured in 1983.
It appears to be in fairly good shape however the chuck and backing plate is
missing on this lathe. It did come with turning plate. My problem is that I
have an 8" chuck and backing plate with a 2 1/4"x8 mounting hole but it
doesn't go on the jet. It appears the jet is a 2 3/8" hole but it is an 8
thread where as all the backing plates I've been able to locate in 2 3/8ths"
are a 6 thread. Is there anyone on this forum who has had any experience
with these backing plates or have any idea where to acquire one?

Sounds like an easy turning job to me, enlarging a 2 1/4" x 8 backing
plate to 2 3/8" x 8--all you need is a metal-turning lathe with
threading capabilities, and a faceplate.

Or -- if you can do so for less -- get blank plates, perhaps
with a 2" unthreaded hole (or smaller), or with no hole.

Set it up on the faceplate, clamped in place with spacers
between the faceplate and your backing plate to be, so you don't cut the
faceplate itself, tap it to center and clamp it down hard. Then drill
the center, bore out to the proper ID, and internally thread.

But before this, set up to measure the thread pitch diameter of
the spindle (3-wire method, unless you have a pitch diameter micrometer
of the right range). Otherwise, as you get close, you'll have to keep
unthreading the faceplate and backplate combination, reversing it, and
testing it for fit on the spindle nose. With that big a pair of plates,
this will get old fast. :-)

Once you have it properly threaded, and the register cut, mount
it, and turn the mounting face flat, and true the OD, then turn the
necessary step to center it to the lathe chuck, and mount as necessary.

Among other possible sources, Bison makes blank backing plates,
as well as pre-threaded ones, and New England Brass and Tool sells them.
(I've bought the pre-threaded ones from them, as I only needed to fit a
2-1/4x8 spindle which was supported. Yours *might* be, or might not.
But the unthreaded blanks are cheaper, of course. :-))

At least the Jet import lathes can cut their own spindle thread.
Some of the others have a metric spindle thread, but are sold here with
the gearing to cut only Imperial threads, so you are stuck having to buy
chucks or backplates from the vendor. :-)

Good Luck,
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 ---

"rhncue" wrote in message
...
I picked up a jet 12x40 bench lathe today. It was manufactured in
1983.
It appears to be in fairly good shape however the chuck and backing plate
is
missing on this lathe. It did come with turning plate. My problem is that
I
have an 8" chuck and backing plate with a 2 1/4"x8 mounting hole but it
doesn't go on the jet. It appears the jet is a 2 3/8" hole but it is an 8
thread where as all the backing plates I've been able to locate in 2
3/8ths"
are a 6 thread. Is there anyone on this forum who has had any experience
with these backing plates or have any idea where to acquire one?

have you tried Jet?

Qn

Thanks,
Dick


--
Richard H. Neighbors
Building fine pool cues for real pool players at affordable prices.
Over 35 years experience in cue repair.
318 Linden st.
Cinti. OH 45216
ph# 513 233-7499
web site: http//www.dickiecues.com

Last night I kept looking for Jet tools web-site but kept coming up blank. I
found it today as the company actually has a different name. Anyway I'll
contact them Monday about a backing plate. On their site they have available
parts but they all seem to be for newer machines. I may have to make a
mounting plate anyway as I was wanting to put a set-true chuck on the lathe
and they certainly won't have one of them.
The spindle on this lathe looks like it was threaded for a millimeter
instead of imperial threads as it is almost exactly 60 mil. however the
threads are 8.
Thanks for the help all and I'll get back with you all when I've got
it up and running and let you know what course of action I took. One remedy
that wasn't mentioned was to turn the spindle threads down to standard
instead of increasing the backing plates size. I've got a few days to decide
what I'm going to do.
Thanks again,
Dick

--
Richard H. Neighbors
Building fine pool cues for real pool players at affordable prices.
Over 35 years experience in cue repair.
318 Linden st.
Cinti. OH 45216
ph# 513 233-7499
web site: http//www.dickiecues.com
"Quincy" wrote in message
...

"rhncue" wrote in message
...
I picked up a jet 12x40 bench lathe today. It was manufactured in
1983.
It appears to be in fairly good shape however the chuck and backing plate
is
missing on this lathe. It did come with turning plate. My problem is that
I
have an 8" chuck and backing plate with a 2 1/4"x8 mounting hole but it
doesn't go on the jet. It appears the jet is a 2 3/8" hole but it is an 8
thread where as all the backing plates I've been able to locate in 2
3/8ths"
are a 6 thread. Is there anyone on this forum who has had any experience
with these backing plates or have any idea where to acquire one?

have you tried Jet?

Qn

Thanks,
Dick


--
Richard H. Neighbors
Building fine pool cues for real pool players at affordable prices.
Over 35 years experience in cue repair.
318 Linden st.
Cinti. OH 45216
ph# 513 233-7499
web site: http//www.dickiecues.com

On Sat, 29 Jan 2005 21:30:38 GMT, "rhncue"
wrote:

Last night I kept looking for Jet tools web-site but kept coming up blank. I
found it today as the company actually has a different name. Anyway I'll
contact them Monday about a backing plate. On their site they have available
parts but they all seem to be for newer machines. I may have to make a
mounting plate anyway as I was wanting to put a set-true chuck on the lathe
and they certainly won't have one of them.
The spindle on this lathe looks like it was threaded for a millimeter
instead of imperial threads as it is almost exactly 60 mil. however the
threads are 8.
Thanks for the help all and I'll get back with you all when I've got
it up and running and let you know what course of action I took. One remedy
that wasn't mentioned was to turn the spindle threads down to standard
instead of increasing the backing plates size. I've got a few days to decide
what I'm going to do.
Thanks again,
Dick

Dick..you may not be aware of it..but our very own Leigh at
MarMachine is a Jet dealer. He posts here
occasionally. You might want to drop him an email and see what he can
do for you.

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

I just got a hold of Jet and all they said was that I have an obsolete
machine that they no longer have parts for. I asked the man what exactly the
size and pitch of the spindle was and I would make my own plate and upon
checking he said that it was a D-4. I told him it certainly wasn't a D-4 but
a threaded spindle and he then transferred the call to someone supposedly
more knowledgeable about their older equipment but that person wasn't
available.
Now my question to you fellows is: if this was your lathe, would you make
a faceplate to fit this thread or would you turn the spindle thread down to
2 1/4-8 from 60mm-8 so as to make it standard for future use?
Dick
--
Richard H. Neighbors
Building fine pool cues for real pool players at affordable prices.
Over 35 years experience in cue repair.
318 Linden st.
Cinti. OH 45216
ph# 513 233-7499
web site: http//www.dickiecues.com
"Gunner" wrote in message
...
On Sat, 29 Jan 2005 21:30:38 GMT, "rhncue"
wrote:

Last night I kept looking for Jet tools web-site but kept coming up blank.
I
found it today as the company actually has a different name. Anyway I'll
contact them Monday about a backing plate. On their site they have
available
parts but they all seem to be for newer machines. I may have to make a
mounting plate anyway as I was wanting to put a set-true chuck on the
lathe
and they certainly won't have one of them.
The spindle on this lathe looks like it was threaded for a millimeter
instead of imperial threads as it is almost exactly 60 mil. however the
threads are 8.
Thanks for the help all and I'll get back with you all when I've got
it up and running and let you know what course of action I took. One
remedy
that wasn't mentioned was to turn the spindle threads down to standard
instead of increasing the backing plates size. I've got a few days to
decide
what I'm going to do.
Thanks again,
Dick

Dick..you may not be aware of it..but our very own Leigh at
MarMachine is a Jet dealer. He posts here
occasionally. You might want to drop him an email and see what he can
do for you.

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

My advice is to leave the spindle alone and find a back plate with the
correct thread. It mat take some digging, but surely there ar a few out
there. Once you put a bit to the spindle, there is no telling what
you'll find out about its metallurgy and soundness.

Several factories in China made these small lathes during the '90s, and
all of them vary in the details of their construction and in overall
quality. The PLA kept the really good ones for its own production use,
and shipped the rest to us fat Americans...

rhncue wrote:

I just got a hold of Jet and all they said was that I have an obsolete
machine that they no longer have parts for. I asked the man what exactly the
size and pitch of the spindle was and I would make my own plate and upon
checking he said that it was a D-4. I told him it certainly wasn't a D-4 but
a threaded spindle and he then transferred the call to someone supposedly
more knowledgeable about their older equipment but that person wasn't
available.
Now my question to you fellows is: if this was your lathe, would you make
a faceplate to fit this thread or would you turn the spindle thread down to
2 1/4-8 from 60mm-8 so as to make it standard for future use?
Dick

In article ,
Tim Killian wrote:

My advice is to leave the spindle alone and find a back plate with the
correct thread. It mat take some digging, but surely there ar a few out
there. Once you put a bit to the spindle, there is no telling what
you'll find out about its metallurgy and soundness.

Sounds like good advise UNLESS you can grind the threads with a toolpost
grinder; if so you might consider changing the threads, especially if
the lathe cannot thread the spindle nose thread.

--
Free men own guns, slaves don't
www.geocities.com/CapitolHill/5357/

In article ,
rhncue wrote:
I just got a hold of Jet and all they said was that I have an obsolete
machine that they no longer have parts for. I asked the man what exactly the
size and pitch of the spindle was and I would make my own plate and upon
checking he said that it was a D-4. I told him it certainly wasn't a D-4 but
a threaded spindle and he then transferred the call to someone supposedly
more knowledgeable about their older equipment but that person wasn't
available.
Now my question to you fellows is: if this was your lathe, would you make
a faceplate to fit this thread or would you turn the spindle thread down to
2 1/4-8 from 60mm-8 so as to make it standard for future use?
Dick

How big is the Morse taper in the spindle? Might your threads
get too shallow if you turned down to 2-1/4x8? Check that before you
thread.

I understand that at one period, Jet used to turn the metric
spindle thread off the spindle, heat-shrink a sleeve onto it, and
rethread the OD of the sleeve *on* the lathe, to a standard thread.

Also, look at the end of the nose to see whether you can see
signs of a sleeve having been heat-shrunk in place. Beware that if that
is the way your machine was done, re-threading it may make the sleeve
too thin, and it will split off.

I know that the Jet which we had new at work back around 1990
was a D series spindle nose -- I think a D1-4 was what it was called.

The D series (like the L-00 on my Clausing) has the advantage
over a threaded spindle that you can take serious cuts in reverse
without risking the chuck unscrewing from the spindle.

Good Luck,
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 ---

Don't get you hopes up to high as in that time frame many Jets had a
Metric sized spindle with inch threads..

Yes I have one and its almost 2 1/4 by 8 but mine is actuall 52mm by
8tpi. And I finally got a manual from Jet that confirmed this. My
lathe is smaller at 10x24 than yours.

I think the had some 55mm by 8tpi also.

Still not hard to make your own but you really need to 3 wire your
spindle and make sure you have what you are guessing you have.

Garry


On Sat, 29 Jan 2005 21:30:38 GMT, "rhncue"
wrote:

Last night I kept looking for Jet tools web-site but kept coming up blank. I
found it today as the company actually has a different name. Anyway I'll
contact them Monday about a backing plate. On their site they have available
parts but they all seem to be for newer machines. I may have to make a
mounting plate anyway as I was wanting to put a set-true chuck on the lathe
and they certainly won't have one of them.
The spindle on this lathe looks like it was threaded for a millimeter
instead of imperial threads as it is almost exactly 60 mil. however the
threads are 8.
Thanks for the help all and I'll get back with you all when I've got
it up and running and let you know what course of action I took. One remedy
that wasn't mentioned was to turn the spindle threads down to standard
instead of increasing the backing plates size. I've got a few days to decide
what I'm going to do.
Thanks again,
Dick