Hey, I have a weird thing going on on one axis on my surface grinder. The head up/down is run through quite a large gear reduction, so the scale factors for that axis are quite high. The weird thing is I can only command as little as 0.0004" movement. any movement smaller than that and the DRO position changes, but it does not actually send any movement commands to the motor (checked with an oscilloscope). Any ideas where... ... to start looking at that? Using riocore with a traditional step/dir stepper motor, not sure if that affects this. I was thinking MIN_FERROR but playing with that value didn't change the behavior. [AXIS_Y] MAX_VELOCITY = 0.4 MAX_ACCELERATION = 0.9 MIN_LIMIT = -112.0 MAX_LIMIT = 112.0 MIN_FERROR = 0.01 FERROR = 2.0 [JOINT_1] P = 250.0 I = 0.0 D = 0.0 BIAS = 0.0 FF0 = 0.0 FF1 = 0.0 FF2 = 0.0 DEADBAND = 0.00005 MAXOUTPUT = 300 TYPE = LINEAR FERROR = 0.05 MIN_LIMIT = -112.0 MAX_LIMIT = 112.0 MAX_VELOCITY = 0.4 MAX_ACCELERATION = 0.9 STEPGEN_MAXACCEL = 20.0 SCALE_OUT = -20320.0 SCALE_IN = -20320.0