I think you just move one or the other gear in or out using a smaller gear or a spacer so the line up. It's been at least 43 years since I used a lathe without a feedbox.
Glen

Here's a discussion on this; https://www.practicalmachinist.com/forum/threads/stud-gear.388949/

Hi guys! I've got the gear locations for screw-cutting figured out (stud is topmost, just in front of the two little gears, the comp is next lowest, and the screw is bottom-right, attached to the carriage lead screw.), but there's still one thing that has me stumped: What do you do if the thread you're cutting doesn't call for comp gears (which most threads don't)?? How do you get the stud gears to mesh with the screw gear?? As far as I can tell, they're completely out of react from one another.? Surely Dalton would have listed a pair of gears to put in the comp position if doing so was necessary, but I can't see how this is done with this spot empty. Am I missing something?
Thanks!

Thanks, Glen !? I'll give that a try and report back with my findings.

Sorry for the misunderstanding, DW.

The last time I tried to set up the old style gearing I gave up without a struggle, just because a feed box makes it so easy that it's part of my understanding of the lathe. One of the questions I stumbled on was the term "stud" and not knowing which position it meant, however, you only have three opportunities, two of which are wrong, so it should still be easy, just don't choose a thread that needs compound gearing to make it work until you make your discovery (I think compound gears go on the stud if I'm not wrong, Haven't looked at a selection plate in a while).

To test your setup engage the half nuts and make a mark on your chuck with a felt pen and an opposing mark on the headstock so they line up. (Leave the power off for this) divide one inch by the number of treads per inch, in this case it would be .050". Set a dial indicator to show the movement of the carraige at zero and pull the chuck over by hand exactly one revolution, the indicator should read .050" if you have it right. Much easier with a DRO.

开云体育

I ask because I’ve the same question!

Hi John! No, not yet. I just need to know exactly which gear is which on the gears, as listed on the back plate. Thanks!

I'm a certified machinist, but it's been about 6 years, and several hospitalizations at the VA, since I've done anything in my machine shop.? I'm not asking how to cut threads, just how to cut them manually with a machine like the Dalton, and at this point, the only info I need is which gear goes where as labeled on the back cover.? I'm cutting the inside of two1.5" OD tubes, 20 tpi NS, and the outside of a 3/4" OD tube, 28 NS.? I know how to cut threads on a modern lathe. I'm curious, DW: in the time it took to write that snarky, unhelpful reply, why you couldn't simply have answered my question about the gears, or let someone else help?

开云体育

Did you ever get your stud gear question answered?

?So you still think you know what size he wants to make an internal thread in, or what hand? BTW, I only saw one 1 1/4 - 20 tap for $25.50 tap and with shipping it's $39.40, maybe he isn't rich enough to pay that for a one time ID thread, especially when he wants to learn how to become more savvy than hobby lathe users who never learn to thread with their lathes, we all started sometime. Besides all that we still don't know what size hole he does want to tap, or even if it's a common size.

Above all that, he didn't ask where to buy a tap, he asked how to set up his lathe to cut threads.

I'm curious DW, how did you knew the internal diameter is small enough that a tap is made for it? If he's making a telescope eyepiece fitting it may be 1.25 X 20 TPI, but he didn't say, or, he may be wanting a 1/2 X 20 TPI hole in a muzzle brake for extreme accuracy and fit, I sure don't know.

Thank you, Glen! Yes, I'm all set, except for how to put on gears.? I just need to know which gear is the stud, which gear is the screw.? I'm doing a 20 tpi internal thread.?

I apologize Joseph, when I saw your email last night searching for a youtube video that would cover it and found four that didn't cover them, and intended to continue however I was exhausted after two day work which I'm not used to and turned in early. What video did you find?
?Of course South Bend lathe's early book "How to run a lathe" made before they switched to gear feed selector types should have a great deal of information, and myself, after a lifetime past my first lathe which did use pick off gears, I've forgotten all of it and recently thought about this because I own several older lathes which I keep for display and historical purposes.
?I'm glad you found the info!

Glen Linscheid