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Question about removing spindle on Jet lathe



 
 
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  #1  
Old July 11th 05, 11:05 PM
Bob Engelhardt
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Default Question about removing spindle on Jet lathe

I have a Jet 1024 and I was turning down a back plate for a chuck, in
back gear. All of a sudden it slowed and stopped. Not a "clunk" stop,
more like the brakes being applied. I determined that the spindle
pulley is binding and I plan to remove it.

Here is an exploded parts view of the spindle, with the non-obvious
parts id'ed:
http://home.comcast.net/~bobengelhar...he_spindle.jpg

I removed the outboard lock nuts and feed drive gear, and the set screw
in the retaining ring. I assume that the spindle is removed by
driving/pulling it out the inboard side. Before that:
- does the bull gear key clear the seals and bearing inner race, or do I
have to remove them? On the diagram, the spindle diameter is smaller
where the key is, but is it small enough?
- if the seals and bearing don't have to be removed, does the end plate
have to?
- there are holes on each side in the top of the spindle housing:
http://home.comcast.net/~bobengelhar...le_housing.jpg
that look like lube holes, but the spindle bearing are lubed from the
front (reservoir and sight glass). Could there be set screws in there
to retain the outer race? But the outer race wouldn't have to be
removed anyhow, so I guess that's moot.

Anybody know of any gotcha's?

I'd say that pulling the spindle out is better than driving it out, but
I'd have to make a puller. Is it enough better to be worth making the
puller?

Thanks,
Bob
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  #2  
Old July 12th 05, 12:12 AM
Jim Stewart
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Default

Bob Engelhardt wrote:
I have a Jet 1024 and I was turning down a back plate for a chuck, in
back gear. All of a sudden it slowed and stopped. Not a "clunk" stop,
more like the brakes being applied. I determined that the spindle
pulley is binding and I plan to remove it.

Here is an exploded parts view of the spindle, with the non-obvious
parts id'ed:
http://home.comcast.net/~bobengelhar...he_spindle.jpg

I removed the outboard lock nuts and feed drive gear, and the set screw
in the retaining ring. I assume that the spindle is removed by
driving/pulling it out the inboard side. Before that:
- does the bull gear key clear the seals and bearing inner race, or do I
have to remove them? On the diagram, the spindle diameter is smaller
where the key is, but is it small enough?
- if the seals and bearing don't have to be removed, does the end plate
have to?
- there are holes on each side in the top of the spindle housing:
http://home.comcast.net/~bobengelhar...le_housing.jpg
that look like lube holes, but the spindle bearing are lubed from the
front (reservoir and sight glass). Could there be set screws in there
to retain the outer race? But the outer race wouldn't have to be
removed anyhow, so I guess that's moot.

Anybody know of any gotcha's?

I'd say that pulling the spindle out is better than driving it out, but
I'd have to make a puller. Is it enough better to be worth making the
puller?


I have the same lathe and I pulled the spindle
to change the belt and clean and lub it.

I removed mine from the bed side.

I remember fighting the keys, but not which ones.
I also remember fetching my wife and having her
catch the spindle while I supported one side of
it and tapped it out with a rubber mallet.
Definitely a 3 hand job.

I disassembled most of the headstock shafts and
gears to clean and lub and a recurrent problem
was shafts binding because setscrews had turned
up a burrs on shafts. I filed small flats for
all of the setscrews when I reassembled it.

From what I can gather from your description,
the coaxial shaft for the back gear is frozen
to the spindle shaft. If so, I strongly suggest
you squirt a bunch of penetrating oil into the
oil hole and try to free it *before* attempting
disassembly. If it is stuck while you're trying
to free the spindle, you won't have any feel for
the amount of force you're putting on the spindle
bearings.

Good luck. I wished I could remember more to
help you.


  #3  
Old July 12th 05, 05:16 PM
Bob Engelhardt
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Default

Jim Stewart wrote:
....

From what I can gather from your description,
the coaxial shaft for the back gear is frozen
to the spindle shaft. If so, I strongly suggest
you squirt a bunch of penetrating oil into the
oil hole and try to free it *before* attempting
disassembly. ...


Good point, thanks. Bob
  #4  
Old July 12th 05, 06:09 PM
R. O'Brian
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Default

One of the many advantages of using a VFD with a lathe is that you will
likely never need back gear.

Randy


"Bob Engelhardt" wrote in message
...
Jim Stewart wrote:
...

From what I can gather from your description,
the coaxial shaft for the back gear is frozen
to the spindle shaft. If so, I strongly suggest
you squirt a bunch of penetrating oil into the
oil hole and try to free it *before* attempting
disassembly. ...


Good point, thanks. Bob



 




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