Weird Mach 3 stuff

Hi all,

I've been on this group for some years now, mainly lurking and
lurning. (sic) Recently I bought a Chinese round column mill that was
converted with Nema 34 steppers and Mach 3. I had some trouble with
tuning the motors and noticed that there was an arcing short in the X
axis connector, along with some lag in the jogging when I switched
directions.

The weird thing is that after I switched the connector and the stepper
drive, the lag when jogging continued. But the weirdest part was that
the DRO on Mach3 showed the lag. It didn't count past the steps it
was supposed to be taking. Occasionally it stalled, but when I
brought the velocity and acceleration down to a slower rate the
stalling stopped, but the lag continued.

The only thing I can think might be causing the motor to lag when it
changes direction is in the software. I changed the driver from the
Hubbard CNC drive that came with the mill to a Gecko 201 and hardwired
the connection. Like I wrote above, you can see the lag on the DRO in
conjunction with the motion.

Anyone else have this problem? If so, anyone know a fix for it?

Thanks,

Scot