Lathe Threading Set Up

I've seen this done. Looks like a good technique. I'm not sure if it is. I know for odd pitch you can only engage the lead screw in two spots on the thread dial. I'll have to check.
 
I don't think you said what brand/model the lathe is. I'd like to know:). Gear train looks similar to an Atlas I had.
Aaron
 
It's an Acra-Turn. I believe it was made in 2000. I have no manual for it so learning as I go along. No Atlas but it seems surprising of somewhat good quality.
 
My lead screw is 6 threads per inch.
 
Could we also see a picture of the shift dials or levers?
 
Thread chasing dial engagement rules for English pitch threads. Even # threads you can engage half-nut on any line. Odd # threads you can engage on any numbered line . Half pitch threads use number 1 or 3 line.

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rlgustin said:
Thread chasing dial engagement rules for English pitch threads. Even # threads you can engage half-nut on any line. Odd # threads you can engage on any numbered line . Half pitch threads use number 1 or 3 line.

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My dial has no numbers but lines at noon and six o'clock. I've found on odd thread these are the only places I can engage. On even threads It seems like I can engage anywhere, even between divisions and still the roots/threads line up. I have not officially made any threads yet. I mean non that looked nice or worked. Used a pen to mark and this is what I have come up with so far. Have not tried this with metric yet.
 
The lines at noon and 6 represents the 1 an 3 . Old school way I was taught always use #1 and you'll be safe.

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ddickey said:
Thanks guys for the reply's. I think I have it figured out now. I did the test Tom suggested and determined I cut a 28 pitch. I now I knew what numbers the gears were and figured out where they were placed. I've included a pic of my change gears.
From what I can tell The large gear on the bottom is E and is coupled with C which is hidden.
The next gear up is D and is coupled with the B gear. Gear A is driven by B. The gear next to A must not be changed which would make sense as the small gear above has no adjustments. Does this sound correct?
No manual Mike. Thanks for the explanation though.
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Sounds correct to me.

Thanks for the pic of the dials. Interesting lathe, hope you enjoy it.

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