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    Sorry about the small pic, it'll come up if you...

    Sorry about the small pic, it'll come up if you click on it. Not sure why it rotated when it uploaded.
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    Oh, what a difference new spindle bearings can...

    Oh, what a difference new spindle bearings can make!
    Made a few test cuts in mild CR steel, various feeds just to see what sort of finish I could get.
    Some came out like a mirror, I had to see it...
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    >> That is fine, what CLASS of cups and cones. It...

    >> That is fine, what CLASS of cups and cones. It came with Class 0 from L&S

    Class 0. Very expensive
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    One word of caution for anyone else with one of...

    One word of caution for anyone else with one of these lathes .... make sure you give the carriage oiler enough pumps to get that carriage floating. You'll know you're there when you try to push the...
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    Yep, new cups and cones. Cups were carefully...

    Yep, new cups and cones. Cups were carefully aligned and pressed into the housing with plenty of lube. There is no oil pump per se, it's a slinger arrangement that scrapes oil from the bull gear.
    ...
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    >> What weight/viscosity oil is in use with the...

    >> What weight/viscosity oil is in use with the heating?

    Not at the shop right now but I believe DTE 25 (whatever the L&S manual called for)
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    Well, I bit the bullet and replaced the spindle...

    Well, I bit the bullet and replaced the spindle bearings. The old races were just beginning to show some surface scuffing and I found some rollers with slight flat spots. I guess that explains some...
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    >> ..two cures Ive seen are cutting holes and...

    >> ..two cures Ive seen are cutting holes and rivetting a sheet of fibre to the flat face of the gear...

    Never heard of the fibre sheet cure, but I like it. Thanks for that tip! Next time I pull...
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    >> I have wondered if the OP could quiet the...

    >> I have wondered if the OP could quiet the lathe by delivering oil into the noisy gear contact faces. ....

    That's a thought. Now that it's all back together I'm gonna run it for a while, but at...
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    >> .... but if the gears are being moved axially...

    >> .... but if the gears are being moved axially into and out of mesh while remaining on the same shaft at a fixed center distance ....

    That's it exactly. The entire gear cluster (3 gears) is slid...
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    Eccentric mounted .... Iíll need to pop the lid...

    Eccentric mounted .... Iíll need to pop the lid and take another look, but as of now it seems ok so Iím going to leave it be and run it for a while. As it is, the gears are fully meshed. Pushing them...
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    I changed the headstock oil to a much thicker oil...

    I changed the headstock oil to a much thicker oil today and gave it a spin to see if it would quieten down the noise. It did, very slightly. But the spindle bearings settled at 120 deg after an hour,...
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    Ok, that's fair. I'm running a heavier oil in the...

    Ok, that's fair. I'm running a heavier oil in the headstock today and it seems to quiet things slightly. Aside from the noise it's a beautiful machine to work with. I've also heard reports about...
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    So itís nothing to be concerned about? Glad to...

    So itís nothing to be concerned about? Glad to hear that. The gears look good to my untrained eyes, no broken teeth or signs of abuse
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    There is no adjustment for the gear spacing....

    There is no adjustment for the gear spacing. These shafts sit in line bored holes.

    I posted this video on YouTube. Unfortunately the machine is so loud it drowns out what I'm saying .... so, when...
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    Oh ... one more thing ... the spindle housing...

    Oh ... one more thing ... the spindle housing just behind the chuck settles at around 100 degrees after running in top gear for a few hours. Is that normal for a machine over 50 years old? Seems...
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    I think my headstock is a bit different design....

    I think my headstock is a bit different design. But hereís a question .... can the spindle bearings be bad and still this machine produces a glass smooth cut? Iím sort of assuming the bearings are...
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    Update ... The headstock only really howls in...

    Update ...
    The headstock only really howls in top gear. So I moved the shifter into top gear, then very slightly out of position, and everything got much quieter. Popped the lid off the headstock to...
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    Running it in a bit since I fit a few new...

    Running it in a bit since I fit a few new bearings. Main spindle bearings are still the originals (I think). Temp at the headstock near the main timkens settled at 102 deg Farenheit after an hour at...
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    Update ..... got it all back together and still...

    Update ..... got it all back together and still makes some noise but not the screeching I heard before at full speed. At this point I'd say it's normal spur gear noise. Time to start putting my new...
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    Oh, yes I do have the manual. Exploded views of...

    Oh, yes I do have the manual. Exploded views of everything. And yes, that roomy headstock is a real blessing.
    Getting the input shaft out isn't straightforward. The spindle bull gear is in the way....
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    Glug, >> what is the root cause and what...

    Glug,
    >> what is the root cause and what action should be taken to prevent it in the future?

    Good question. Any unusual play in the pulley bearing would put an additional load on the center...
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    Pic of the disassembled input shaft. Not sure why...

    Pic of the disassembled input shaft. Not sure why it didn't upload wit the previous post ...

    254648
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    Gears all look good. So, moved on and pulled the...

    Gears all look good. So, moved on and pulled the input shaft. Inspected the bearings and found spalling(?) in the center bearing. There's my noise! Not sure why a ball bearing was used there and not...
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    Richard, I believe it's a 1965 machine. Not a lot...

    Richard, I believe it's a 1965 machine. Not a lot of visible wear. No notches in the compound. I drained the oil and cleaned all the innards over the weekend. All the gear tooth wear patterns look...
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