Abstract : This paper introduces the design scheme of a PC-based five-axis linkage CNC system. This system can be used for surface and internal quality inspection of workpieces with complex shapes, and has strong operability and practicality. Keywords : Five-axis linkage; CNC; Servo 1 Design Scheme of Mechanical and Control Part of Five-Axis Linkage CNC System To obtain certain information (such as hardness, roughness, etc.) from the surface of a workpiece with a complex shape, it is necessary to ensure good contact between the inspection instrument (probe) and every point on the surface of the part. This is to obtain relatively accurate data information, thus providing an accurate basis for inspection and analysis. To achieve this, the instrument must be able to move freely on the surface of the workpiece. The five-axis linkage motion system is designed based on this purpose. The mechanical motion of the five-axis linkage system includes linear motion (x, y, z) in three-dimensional space and rotational motion (A, B) in two mutually perpendicular directions. The combination of these five motion forms can ensure that the instrument can be positioned in any direction at any location in space. The movement of the instrument (or probe) is executed according to the instructions issued by the control system. The five-axis linkage system can adopt an open-loop control method and consists of a control device, an actuator, and a controlled object. Considering the system's processing speed and real-time detection requirements, a PC586 can be used as the controller for this system. It will be responsible for calculations, speed control, and motor rotation direction control. [b][align=center]For more details, please click: Design of a PC-Based Five-Axis CNC System[/align][/b]