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maybe engage half nuts,set up dial indicator and turn lathe by hand 1 revolution and measure travel.Compare to chart on lathe and see where you are.

Hi KYP,looking at the chart on the lathe,to cut a metric 1.25 thread,set the machine on: 1:H which is the gear train you mentioned:C: 4.
You never mentioned Lever 1 or Lever C.
Cheers Walter Mitty

Apologies KYP train is 48 driving 127 driving 71 driving38
Cheers Walter

Hi KYP,my gear train which in conjunction with a 4 TPI leadscrew is:48Tdriving127T which drives38T which is mounted on the lowest shaft .Seems to be the feed gearbox shaft.
Cheers Walter Mitty

Hi KYP,
you don't say whether your lead screw is metric or imperial. Mine is imperial ,4TPI and the gear train to cut imperial threads are:upper gear48,driving 127 which drives 71 which drives 38 on...

Hi Tom,I would appreciate a copy of your file pages.How does one arrange a PM I assume PM means a personal memo.
Cheers Walter Mitty

Thanks Tom,I agree the Hamatu is a great machine.I purchased mine in 2008 and as it is a 3 phase machine I installed a phase changer to drive it Mine is a1972 model but still is very...

Hi Tom,I and, I assume, KYP would very much appreciate a copy of the manual.What's the best way to achieve this ?
Cheers Walter Mitty

Hi KYP,thanks so much .Exactly what I required.And I appreciate your promptness
Cheers Walter Mitty

Hi KYP,I also have a HamatuTH-6 lathe and also no documentation.Further my lathe doesn't have the thread cutting chart on the machine.I wonder if yours has this and if so are you able to post a...