Hi ALL,
I haven't tried threading with V3.042.20 or even loaded it on the my laptop.
So just want to peg a time line and version which was used by me and some info for others to relate.
The last threading I did was with V3.042.018. Steppers,Single index slot, G32 code ( no G76 CANNED CYCLE )
and all worked just great. Before cutting any threads, spindle speed ( manually set and manually varied)
along with the G94 the G95 was checked. Mach's RPM readout was the best ever, varying and recovering to correct DRO indication inclusive of the z axis behaving appropriately. Backlash compensation was used.
Now i only cut about five threads.
The first experiment confirmed to me that the puny lathe was going to do good because spindle slow down was varied to mimic a heavy cut and the z movement responded, tried to deliberately screw the thread up by manipulating the speed at the start, during ( about 40%), and end of the thread. Leaving two finish passes to clean it up. The thread didn't come out to well, but, remember this was just a brutal test.
Now the other ones were "very good" and to dimension. So with that limited testing......life is good.....and left things alone.
The SS stepper setup also seemed to work very well in dry running but without backlash available no actual testing was done.
So until I try out .20, can't say much more.
RICH