hey everyone, haven't been here for awhile but need some advice. I have a gantry machine with ball screws on X&Y axis directly driven by 820 oz steppers, I haven't been able to run the machine at more than 50% of slow jog without it stalling and jerking, it then misaligns the gantry. My question is this, is there something I missed or is there insufficient torque by these motors and do I have to use timing gears and belts. Any help would be appreciated.