... is with a big power supply & high subdivision stepper motor driver & pc board of controller,Convincing arguments: ... the installation of the back shell. All the stepper mounts, ball screw mounts are made of steel ... functions such as STEPPER FREE, EMERGENCY STOP, LIMIT/TOOL ADJUST SENSORS, SPINDLE CONTROL, HALF DRIVE CURRENT, OVER-THERMAL ... .so it is quite good . CNC/Manual Milling & Drilling Machine BF46