10-22-2013, 07:25 PM
Is this possibly the first time you've cut 20 tpi on this lathe? The reason I ask, there was one tpi don't remember which that my Taiwanese 14x40 wouldn't cut if I opened the half nuts, same problem your getting. Would cut all the others I tried with no problem.
Free advice is worth exactly what you payed for it.
Greg
Greg