As has been pointed out in this group before, same goes for doing metric on
an imperial machine.
When you have the 127 gear on (or it's counterpart on a metric machine doing
inch work) there is only ONE place you can engage the nut. Google the
archives and you'll find a few tricks to *try* and make it eaaser but in the
long run they are all a PITA.

Dave


"Dean" wrote in message
...
That reminds me,
There is one flaky thing about using a metric pitch machine cutting inch
threads (at least the Russian lathes) & it is that the half nut, on some
pitches, can only be engaged on the exact same unique point on the thread
dial or you might not be in sync with the previous cut. They make it
tricky though by marking the dial like an inch machine so you think you
can just drop it in whenever your number comes by. A colleague of mine
ruined a leadscrew nut for a 5" HBM made from a cu$tom bronze ca$ting due
to this.