Radial drill press as a flexible, convenient operation, its wide application range, typical, especially suitable for single or batch production with large parts of the pore porosity is general machinery processing workshop of common tools. But now on the market is only half of nc radial drilling machine, CNC and numerical control is realized. This paper based on the above reasons for CNC radial drilling machine and its decision on the electric control system development and research paper USES Emerson EC20H PLC control design of sitai servo motor (including servo drive), radial drilling machine, rocker rotate the rocker, spindle box sliding, spindle into four axial movement, PLC control a frequency conversion motor (including inverter) is the movement of the machine tool axis rotation movement. And with a touch screen and PLC through RS232 interface MODBUS, realize the agreement of CNC machine running state of control and monitoring. This paper introduced nc radial drilling machine of electrical control system hardware and software design of electric control system in the aspects of hardware and software to meet the electrical control system of numerical control radial drill. The realization of the radial drilling machine movement and electrical control requirements, the system can be directly applied to practical production and development of the machine tool, but also for future more advanced CNC radial drilling machine development provides reference.关键词:数控;摇臂钻床;PLC;伺服 Keywords: CNC, Radial drilling machine, PLC, servo