... accuracy. It has three 23 high speed stepper motor for X, Y,Z axis. All the stepper mounts, ball screw mounts are made ... to protect them from fritters. Of course, the Z axis stepper does not need a shell, it is completely hidden inside ... all-around functions such as STEPPER FREE, EMERGENCY STOP, LIMIT/TOOL ADJUST SENSORS, SPINDLE CONTROL, HALF DRIVE CURRENT, OVER-THERMAL PROTECTION, etc ...