Department of coordinate of lathe of special numerical control is the coordinate department with inherent lathe of special numerical control, it is the foundation that make and adjusts lathe of special numerical control, also be the foundation that sets workpiece coordinate department. Department of coordinate of lathe of special numerical control has been adjusted before leave factory, do not allow to change at will commonly. Reference point also is a on lathe of special numerical control changeless limit is nodded, its position is decided by mechanical link stopper or journey switch. Affirmed through answering machinery machine tool coordinate is fastened at 0 o’clock. Time machinery should switch on the mobile phone first before 0 o’clock, the face plate of numerical control lathe should be familiar with first before lathe of special numerical control switchs on the mobile phone. The form of face plate is the same as numerical control system closely related. Of lathe of special numerical control switch on the mobile phone have have hard easy. Produce systematic lathe to matching a plan. Switch on the mobile phone to be compared mostly simple, after opening power source commonly, system of the direct numerical control that start can. After switching on the mobile phone, through answering 0, make workbench returns origin of lathe of special numerical control (or reference point, the place that secures a distance at this o’clock to have one with origin of lathe of special numerical control) . Of lathe of special numerical control time 0 (wind reference point) measure is: Switch park ” time 0 ” the position. By the hand direction of the feed that use a rod bolts + X, + Z comes a 0 indicator light are bright. After switching on the mobile phone, must answer first 0 (wind reference point) , if do not make this work, criterion the function such as pitch error compensation, back unoccupied place compensation will not come true. Origin of machinery of set machine tool is the same as the G54 instruction in process designing to be concerned directly.