I was wrong in assuming it was a manual lathe but it sounds like the basic idea is the same in that you are moving the tool a specified amount to act like an indexer.

I always used the indexer or counter to cut multi lead threads (I'm assuming this is a manual lathe) but as the saying goes there is always more than one way to skin a cat and if this method worked for waymon1998 I say good for him.

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I'm not sure what the industry standard is but where ever I have worked in the past it would be considered 1 1/8-4TPI double lead and the drawings always documented as that.

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I could easily be wrong. I just know what I would do on a conventional lathe with a 3 jaws chuck for a 3 or 6 lead lead a 4 jaw chuck for a 2 or 4 or 8 lead thread. On a 5 lead thread we always took the circumference of the chuck and then divided by 5 to then make equal space marks to help us do it on a 5 lead thread. Now if that is .25 or .5 from the start of the other to be honest I had a 50/50 chance of being right or wrong. Biggest thing when I respond to most threads right or wrong it just to get others to help out. Then if I am wrong I learn something or I am reminded of something I have not used in years. On the Mazak this type of thread in conversational is a breeze. You tell it 2 leads and done. I would tell you operator the next time he messed with something he better break out his check book.

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finally a good part. this was a screw that turned off/on our sprinkler system that had been destroyed by a tow motor driver. the company had gone out of business and no replacement parts were available. i had to take the sample part and make a replacement from it. no print available. once i determined it was a 1 1/8"-4 threads per inch double lead i set out to program part in mastercam. after i turned o.d. to size i went to the threading and picked acme general purpose and found that 4 threads was not a selection under 1 1/8" dia. only 5 threads.

I will admit when I'm wrong & I think I might've been wrong on this one after thinking about it a little more. I've done multi starts on cnc before but I oriented the spindle whatever degree needed for # of leads then using the same threading code. On a manual (been a while) but I thought the threading dial will engage at the same position nomatter where you engage it. So as nine blue says you have to index it. In the old days I've even seen a centerline scribed then adjust the top compound when halfnut is engaged until you are positioned at 180 on your centerline. Kinda crude but have seen it work. I would like to hear how it worked out for him also.

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to make part, i chose a lead of 2 threads per inch with a multi-start of 2. using the multi-start the threading tool moved back away from the

Did it work OK the way you ran it? It sounds OK for a manual machine but maybe not for CNC. What sort of cycle were you using?

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The 1st thread will have a pitch and lead of .5 leaving enough space to cut the 2nd thread between the crests of the 1st thread with a result of a pitch of .25 between the crests of all the threads.

end of part .250 every other pass. i was not aware of the multi-pass option until someone previously posted that it was available as an option. thanks!

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1 1/8 2TPI AND RAN IT TWICE MOVING THE STARTING POINT BACK .250 ON THE SECOND PASS. IS THIS THE CORRECT WAY OR AM I MISSING SOMETHING. ANY HELP APPRECIATED.

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I could be wrong because I've never used this method but unless I missed something the logic appears to be valid. And yes I am prepared to eat crow if someone shows there is an error in my logic. Always willing to learn.