12" Atlas Reverse Tumbler Gear Stud

The too short one is hex head and is identical to the other one, but about 0.003" too short. I'm guessing that the gear got changed at some point.
 
OK. Then your problem is not mixed version parts. The Rev A part is 1/8" longer that the base or original parts. Your problem is an out of tolerance part. As it is unlikely that wear from use is the culprit, my guess is that it came from the vactory that way. You have two choices - replace it (Clausing may still carry the part). or shim it. Check on some place like McMaster for bearing shims, inner race shims, outer race shims. You might also try a place like Ace Hardware. You would pay more for one shim, but you won't have to buy a box of them to get one. The shim OD must NOT be any larger than the shoulder diameter. It can be a few thou smaller.

Another possibility, if you have the necessary tooling, would be to reduce the thickness of the hex head.
 
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Actually, I solved the problem by skimming down the face of the gear on my other lathe.
 
Well, that's also a viable solution. But now you have two non-standard parts on the machine.
 
As long as it makes chips - and the lathe is going to be a gift for someone who doesn't have a lathe, so I think they'll be able to look past it.
 
Finally got that woodruff key out. I ended up drilling and tapping for a 6-32 screw near the outboard end, and used a slide hammer.

Spindle is out, inboard bearing is still in the headstock. I'd like to take it out for a full cleaning/inspection - do I remove the inner or outer dust cover and do I pry it with a screwdriver, or use a pin punch? Also, is it common practice to replace the "filter" material in the Gits oilers?
 

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Glad to hear that you got the key out. I think that this is the first time I've heard of drilling and tapping a hole in it and using a small slide hammer.

Yes, to remove the cup, you will need to first remove the inboard dust cover. Then you can try the pin punch but the best choice is an aluminum disk just smaller than the hole that the dust cup fits into and either a slide hammer or better a length of 5/8" or 3/4" dia. threaded rod and a larger shoulder disk that fits the hole where the outboard dust cover fits.

Yes, replace the felts. They also serve as filters. Clausing still has them but you should preferably also have something else to order as they only ship UPS and UPS has a one pound minimum.
 
Regarding the back gears and mating spindle gears on my 12" - would a babbitt head have the same gears as the timken head?
 
Short answer is Yes. Longer answer is that throughout the production of the 3/8" bed lathes (except for the 9" and the models of 10" and 12" that did not have any back gears), both the 10" and the 12" used the same components throughout the back gear assembly except that the 10" and 12" did not use the same left back gear bracket. This is even partially true of the late 12" made from 1957 though March of 1981 in that the two back gears, sleeve (that ties them together) and bushings and two spindle gears are the same all the way back to about 1934.
 
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