CNC vertical lathe cutting efficiency is affected by many factors, including the following aspects:

1. Tool selection and cutting parameters: The selection of CNC vertical turning tools and the setting of cutting parameters directly affect the cutting efficiency. The selection of parameters such as appropriate tool type, tool material, cutting speed, feed rate and depth of cut is crucial to cutting efficiency.

2. Workpiece material and shape: CNC vertical lathe workpieces of different materials and shapes have different effects on cutting efficiency. Workpieces with high hardness and strong wear resistance usually increase the difficulty of cutting and reduce cutting efficiency; while softer workpieces are relatively easy to cut.

3. Machine tool performance and stability: The performance and stability of CNC vertical lathe are directly related to cutting efficiency. Parameters such as machine tool rigidity, spindle speed, and spindle power will affect the stability and efficiency of cutting.

4. Cutting lubrication and cooling: The good cutting lubrication and cooling system of CNC vertical lathe can effectively reduce cutting temperature, extend tool life, reduce cutting force, thereby improving cutting efficiency.

5. Tool wear and replacement: CNC vertical lathe tool wear will increase cutting force, decrease cutting quality, and affect cutting efficiency. Timely monitoring and replacement of CNC vertical lathe tool wear is one of the important steps to improve cutting efficiency.

6. Program optimization and processing path: Reasonable processing path and program optimization of CNC vertical lathe can reduce idling time and rapid movement time, thereby improving cutting efficiency. The optimized processing path of CNC vertical lathe can also reduce vibration and impact during cutting and improve cutting quality.

7. Operator skills and experience: The skill level and experience of CNC vertical lathe operators will also directly affect cutting efficiency. Skilled CNC vertical lathe operators can promptly adjust cutting parameters according to actual conditions to avoid low efficiency or poor cutting quality caused by misoperation.

To sum up, there are many factors that affect the cutting efficiency of CNC vertical turning, and they need to be comprehensively considered and optimized to maximize the cutting efficiency.