CNC machine tools have significant advantages in processing precision parts. They can provide high-precision and high-efficiency machining processes. The following are the general steps and key technologies for CNC machine tool processing of precision parts:

1. CAD/CAM design: First, design the three-dimensional model of the part through computer-aided design (CAD) software. Computer-aided manufacturing (CAM) software is then used to generate CNC programs. CAM software is responsible for converting the designed part model into tool paths and motion instructions that the CNC machine tool can understand.

2. Clamping and positioning: Before processing precision parts on CNC machine tools, the workpiece needs to be clamped and positioned to ensure that it maintains a stable position during the processing process. Fixture design needs to take into account the part geometry and machining needs to prevent deformation and vibration.

3. Tool selection: CNC machine tool selection of appropriate tools is an important step to ensure high-precision machining. The material, geometry, number of edges and other parameters of the tool need to be selected based on the material characteristics and processing requirements.

4. Processing parameter settings: Set appropriate processing parameters such as cutting speed, feed speed and cutting depth. The selection of these parameters affects the cutting forces, temperature and surface quality during machining.

5. CNC programming: CNC machine tools generate CNC programs based on CAM software. Programmers need to write or adjust the program to ensure that the machine tool processes according to the predetermined path and speed. CNC programming needs to take into account aspects such as tool paths, cutting strategies, work advances and retracts.

6. Real-time monitoring and adjustment: During the processing of CNC machine tools, CNC machine tools are usually equipped with real-time monitoring systems that can monitor parameters such as tool wear and temperature changes. Based on the monitoring results, processing parameters can be adjusted in real time to maintain high-precision processing.

7. Surface treatment: High-precision parts of CNC machine tools usually require fine surface treatment. This may include processes such as grinding and polishing to further improve surface quality.

8. Quality inspection: Finally, the processed parts are precisely measured by using measuring tools (such as three-dimensional coordinate measuring machines) to ensure that they meet the accuracy and size required by the design.

Generally speaking, CNC machine tools precisely control tool movement and processing parameters through a highly automated processing process to ensure that high-quality precision parts can be processed efficiently and accurately in a short time.