Lloyd E. Sponenburgh wrote:
"Paul" fired this volley in
:

I've got a Grizzly 9 x 20 lathe and need to cut some threads at 4
tpi. Any thread charts for this lathe I've got only go down to 6 tpi.
Question is, can I cut 4 tpi on this lathe? And what gears do I use?
Has anyone done this? FWIW, when cutting coarse threads I use a hand
crank to turn the spindle.

So, what's the prob. with using the backgears, and turning under
power?


I would be surprised if Grizzly 9x20 has backgears. Their lowest speed is
usually in excess of 100 rpm.

--
Michael Koblic,
Campbell River, BC