... by-step technique.Complete unit with little dimensionsX, Y, Z axis are all updated with ball screws, including two screw ... 23 high speed stepper motor for X, Y , Z axis . The 23 stepper motor are smartly installed in the ... to protect them from fritters. Of course, the Z axis stepper also need a shell, it is completely hide ... else machine .so it is quite good . CNC/Manual Milling & Drilling Machine BF46