The precision machining of shaft parts requires consideration of multiple technical issues to ensure that the final product meets high-precision and high-quality requirements. The following are some key technical issues that need to be paid attention to in precision machining of shaft parts:

1. Material selection: Make sure to select the appropriate material, taking into account its mechanical properties, heat treatment properties, and ease of processing. Different materials may require different tooling and processing parameters.

2. Precision measurement and inspection: Use high-precision measuring equipment, such as three-dimensional coordinate measuring machines or laser measuring instruments, to measure size and shape. Components are inspected regularly to ensure consistent processing accuracy.

3. Tool selection: Select the appropriate tool type, tool material and tool geometry. The choice of cutting tools directly affects surface quality and processing efficiency.

4. Cutting parameter optimization: Optimize cutting parameters such as cutting speed, feed speed and cutting depth. Reasonable cutting parameters can improve processing efficiency and reduce tool wear.

5. Stable machine tools and processes: Choose CNC machine tools with good stability and ensure stability during processing. Stable processes are crucial for high-precision machining of shaft parts.

6. Cooling and lubrication: Use appropriate coolants and lubricants to reduce friction, cool the tool and workpiece, and reduce cutting temperatures. This helps improve surface quality and tool life.

7. Process optimization: Design reasonable processing procedures to avoid unnecessary secondary clamping and repositioning. Reasonable process design helps maintain processing consistency and reduce error accumulation.

8. Heat treatment control: If the parts require heat treatment, ensure the control of the heat treatment process to avoid shape changes and dimensional changes.

9. Vibration control: For long shafts or slender workpieces, the impact of vibration needs to be considered. Take appropriate support and vibration damping measures to ensure stable processing.

10. Precision programming: Use advanced CNC programming technology to ensure smooth and accurate processing paths. Avoid rapid movements and sharp changes in the tool's entry and exit trajectory.

By comprehensively considering the above technical issues, the quality and efficiency of precision machining of shaft parts can be effectively improved. Regular equipment maintenance and calibration are also important steps to maintain processing accuracy.