... -slot (height is 20mm).2.X/Z axis is dustproof , 3-axis (x/y/z) use 85BYG-450A step ... motor .3.XY ball screw is 2510 (diameter 25 , lead is 10), z axis ... helping to suck the dust, milling dust, rotary axis for cylindrical materials, DSP offline control system, when ... the computer and omly use this handle)Rotary axis the forth axis in this machine, (and using this ...