The Reformation and Electric Control Design for X712 Type Numerical Control Mill Machine

The article shows the combination and function of 21DM numerical control system and 21DM NC system is applied to ordinary mill machines by numerated technical reformation of ordinary X712 mill ma- chine.The described set of spindle motor's sheer and speed control,explanation the relation of exchange direc- tion's XYZ axis servo motors and direction of pulse.The employment in fact enunciation system acquired the good control result.It provides the path of technology improvement in factories.