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General Mach Discussion / Re: Mach3 turn spindle synch issues
« on: August 03, 2015, 02:07:16 PM »
It is a long time since I used the parallel port on a lathe but as far as I recall I did not have to input the correct RPM for it to work well, I always had it close but as the lathe had fixed RPMs via an auto gearbox I probably just input a speed close to what I wanted.
That makes me surprised that yours seems to only thread correctly if you command the correct RPM especially as you seem to have the Use Spindle Feedback in Sync option chosen. To my mind that should make Mach look at the true RPM and adjust the Z axis velocity accordingly.
Suppose as long as it works for you now then no big deal but I wonder what would happen if the spindle speed altered during threading due to load, sounds to me like it would not produce a good thread.
Hood
That makes me surprised that yours seems to only thread correctly if you command the correct RPM especially as you seem to have the Use Spindle Feedback in Sync option chosen. To my mind that should make Mach look at the true RPM and adjust the Z axis velocity accordingly.
Suppose as long as it works for you now then no big deal but I wonder what would happen if the spindle speed altered during threading due to load, sounds to me like it would not produce a good thread.
Hood