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The headstock at least certainly qualifies for “Frankenstein”.? The
gear and whatever that is under it did not come from Atlas.? My guess
is that the PO had an eddy current sensor sensing the very fine teeth.

The step pulley, as much as I can see of it, looks original.? But
there is no set screw supposed to be in the pulley.? It should have
one hole drilled through so that it comes out between the two
bushings, which do belong there.? It is only tapped part way through
the hole for an oil plug that looks like a bull-nose set screw.? The
pulley, with the missing direct drive pin pulled out, should be ?free
to spin on the spindle (when it was originally assembled).? Besides
the bull gear and collar, it is also missing the small spindle gear
and undoubtedly the back gears.? The bull gear is about an inch
thick.? The small gear is about 5/8” thick.? It has a keyway cast in
the face that fits up against the spindle.? You can see the keys cast
into the small end of the pulley.

Your probably least expensive way to fix the headstock is to buy
another complete headstock.? Do you know what the model number is?

Robert Downs

*From:*[email protected] [mailto:[email protected]]
*On Behalf Of *Stan Gorodenski
*Sent:* Friday, February 8, 2019 22:51
*To:* [email protected]
*Subject:* [atlas-craftsman IO] My Frankenstein Atlas

I read the manual on how to remove the headstock spindle and what I read
and what I saw made no sense. First, there is supposed to be a collar
held in place by a set screw. The collar is inside the headstock housing
and butts against the rear headstock housing. I can see where there once
was a collar because I can see many circular indentation marks left by a
set screw.

Second, the manual said to drive the spindle from the rear until the key
emerges from the the large spindle gear. This is the gear toward the
front of the housing. However, this made no sense because I did not see
a square hole in the large gear from which the key would emerge.
Instead, I saw a diagonal cut into the side of the front gear that has a
set screw (this is shown in the attached image). The pulley assembly
also has two set screws. I loosened all the set screws and proceeded to
drive the spindle out. Of course, no key emerged (since, as I said,
there was no square gap in the large gear next to the spindle). There is
a slot in the spindle for a key, but no key. What I saw was the spindle
slightly ground into to accept the set screw for the large gear (this is
shown in the image), and the? same thing for the two set screws in the
pulley assembly.

I have a real frankenstein. What the manual calls a large gear I think
is from something else that was modified to fit the spindle. There is no
square slot to accept the key, and, although not seen in the image, the
so called teeth do not look like the teeth of a gear. The pulley
assembly appears to also have been from something else because it is
sleeved to fit the diameter of the spindle. Maybe pulley assemblies were
sleeved, but what is strange about this one is that the set screws were
obviously home made because each set screw is a different diameter. It
is like the person who did this did not have two set screws of the same
size. Since there are indentation marks indicating there once was a rear
collar but not now, it appears the spindle may have come from another
lathe.

Would you all agree this is a frankenstein? I think I can find someone
to mill a slot for a key on the large 'gear', but I probably would still
have to use the set screw to keep it from moving back and forth. I know
the lathe I have is not worth as much as it should be because of
modifications that were made to it that I mentioned last year, but the
situation with the spindle makes it even less valuable.
Stan