Southbend 9 inch lathe with screwcutting gearbox can cut 19 tpi Threads.

[David Powell]

It is not in any catalogue or description, but you can cut 19 tpi by setting the levers to A 7, 6 1/2 TPI with 40 teeth driver and instead of engaging the clasp nut FIRMLY tighten the feed clutch.. You have to leave the clutch engaged and reverse the lathe as needed.. The error is about 3 parts in 1000. Hope this helps some one somewhere. Regards David Powell

[RB211]

It is not in any catalogue or description, but you can cut 19 tpi by setting the levers to A 7, 6 1/2 TPI with 40 teeth driver and instead of engaging the clasp nut FIRMLY tighten the feed clutch.. You have to leave the clutch engaged and reverse the lathe as needed.. The error is about 3 parts in 1000. Hope this helps some one somewhere. Regards David Powell

oops! Wrong thread, disregard.

[The Metal Butcher]

Hmm. Probably not as good as the screw precision. But cool.