There are many factors that affect accuracy in CNC machine tool processing. The following are some main factors:

1. The accuracy of the CNC machine tool itself: The rigidity, stability, accuracy and other properties of the machine tool directly affect the accuracy of processing. If the accuracy of the machine tool itself is not high or there is wear and tear, it will affect the accuracy of the machined parts.

2. Selection and wear of CNC machine tool tools: The quality, geometry, size, etc. of CNC machine tool tools will directly affect the accuracy of processing. Tool wear can also lead to a decrease in machining accuracy.

3. Setting of cutting parameters: The setting of cutting speed, feed speed, cutting depth and other cutting parameters of CNC machine tools directly affect the roughness and shape accuracy of the machined surface.

4. Selection and properties of workpiece materials: The hardness, plasticity, heat treatment status and other factors of CNC machine tool workpiece materials will affect the ease and accuracy of processing.

5. Clamping method and fixture accuracy: The CNC machine tool clamping method and fixture accuracy will directly affect the positioning and stability of the workpiece, thereby affecting the processing accuracy.

6. Processing environment: The temperature, humidity, vibration and other factors in the CNC machine tool processing environment will affect the stability of the machine tool and cutting tools, thereby affecting the processing accuracy.

7. Technical level of operators: The technical level, operating specifications and experience of CNC machine tool operators will also directly affect the accuracy of processing.

8. Settings of processing programs and parameters: Whether the settings of CNC machine tool processing programs and parameters are reasonable and accurate will also directly affect the accuracy of processing.

9. Tool sharpening quality: The sharpening quality of CNC machine tool tools has a great impact on machining accuracy. Poor sharpening will lead to a decrease in cutting quality and an increase in machined surface roughness.

10. Deformation of the workpiece: During the processing of CNC machine tools, the workpiece may deform due to thermal deformation or mechanical stress, thereby affecting the processing accuracy.

To sum up, the machining accuracy of CNC machine tools is affected by many factors, and it is necessary to comprehensively consider and take corresponding measures to ensure the machining accuracy.