Yu Botou are YDZ300 valve CNC machine tools for drilling, valves, valve drilling porous special drill using scraping process, valves special CNC machine tools, special machine tools using artificial valve scraping scraping benefit is the use of a blade, reference surfaces, measurement tools and display agents, by way of manual operation, while the measurement point edge research, while scraping machining the workpiece size required to achieve the process, a finishing step geometric shape, surface roughness and adhesion and other requirements. Since the tool is simple, versatile and strong, small allowance, and the achievable accuracy is very high, it is widely used in the repair work of the machine and tool manufacturing and mechanical devices. Usually the machine guide, carriage, sliding bearing bush scraping methods are used for finishing made. Manual scraping flat repair process is one way, its purpose is to reduce the surface roughness value, to improve the contact and geometric precision, thereby improving overall machine tools and flatness