I have dealt with this annoyance for a couple years now, but I need to find a solution. My steps/unit is 10,000, so I should have a resolution of .0001. Through MDI I can move in .0001 steps (G0 G91 Z-.0001) successfully. I am not able to jog in mpg or incremental mode at .0001. If I give the mpg wheel a spin it will move a few tenths, nothing predictable though.
My setup is MPG and jog buttons through Pokeys 56e, configured through Pokeys plugin for Mach4. Motion is using a Hicon Integra 7766. I don't know if this is a pokeys issue or Mach.
Thanks!