CNC machined parts refer to parts manufactured through computer numerical control (CNC) technology. CNC Machining is a good manufacturing technology that uses computer programs to control machine tools for precise machining operations. The accuracy and quality requirements of CNC machined parts mainly include the following aspects: dimensional accuracy: CNC machined parts should meet the dimensional requirements specified in the drawings, including basic dimensions, tolerances, and deviations. Dimensional accuracy is the foundation for ensuring the assembly and performance of parts. Shape accuracy: The shape and internal structure of CNC machined parts should meet the shape requirements specified in the drawings, such as straightness, flatness, roundness, etc. Shape accuracy is the key to ensuring the aesthetics and functionality of parts. Surface quality: The surface of CNC machined parts should be smooth, flat, and free of defects such as scratches, burrs, cracks, etc. The surface quality directly affects the wear resistance, corrosion resistance, and appearance quality of the parts. Position accuracy: The position accuracy of CNC machined parts includes the relative position and fitting accuracy between each part. Position accuracy is an important factor in ensuring the assembly and performance of parts. Heat treatment quality: CNC machined parts may be affected by heat treatment during the processing, such as quenching, tempering, etc. The quality of heat treatment should comply with relevant standards and requirements to ensure the strength, hardness, and corrosion resistance of the parts. Material quality: The material of CNC machined parts should comply with relevant standards and requirements, such as material composition, mechanical properties, etc. Material quality is the foundation for ensuring the performance and service life of parts.