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- Nov 27, 2012
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I looked it up, Eisen does say 4 TPI for the leadscrew. Also saw in the pics that the thread dial chart is on the front of the thread dial itself. Regardless, for 24 TPI you should be able to engage the half nuts anywhere, no thread dial needed.
The only other thing I can think of is if you are threading using the modified flank method, as in using the compound slide to advance cuts. Typically you would set the compount to just under 30°. Usually on asian lathes, with the compound parallel to the spindle axis, the protractor reads 0. So in order to set the compound to 29.5° or whatever for threading, on your lathe's protractor you would need to set it to 60.5° & NOT 29.5°. This commonly happens. Not sure if that's what's going on in your case but I can't think of anything else right now.
The only other thing I can think of is if you are threading using the modified flank method, as in using the compound slide to advance cuts. Typically you would set the compount to just under 30°. Usually on asian lathes, with the compound parallel to the spindle axis, the protractor reads 0. So in order to set the compound to 29.5° or whatever for threading, on your lathe's protractor you would need to set it to 60.5° & NOT 29.5°. This commonly happens. Not sure if that's what's going on in your case but I can't think of anything else right now.