The programming of CNC vertical lathe is the process of guiding the machine tool to perform processing operations through the CNC programming language (usually G code). The following are the basic steps of CNC vertical lathe programming:

1. Understand the processing requirements: First, the processing requirements need to be clarified, including the size, shape, surface requirements, cutting tools and feeding methods of the processed parts.
2. Prepare the work coordinate system: determine the workpiece coordinate system (usually a subset of the machine tool coordinate system), and program based on this coordinate system. The working origin of the machine tool or a fixed point on the workpiece can be selected as the reference point.
3. Select the tool and process parameters: select the appropriate tool according to the processing requirements, and set the corresponding tool number. Determine the cutting parameters such as the feed rate, speed, depth of cut and cutting direction of the tool.
4. Write the tool path: According to the processing requirements, write the tool path to define the cutting trajectory. The tool path should include the starting point of cutting, the end point of cutting, the direction of cutting, and the required radius or angle.
5. Write tool instructions: Use CNC programming language to write tool instructions to guide the movement of the machine tool. Common CNC programming languages include G code and M code.
6. Check and verify the program: After the program is written, the program should be checked and verified. The correctness and safety of the program can be verified by simulation software, automatic mode of the machine tool or manual mode.
7. Upload and run the program: upload the written NC program to the control system of the NC vertical lathe. Then, set up the machine tool according to the position of the workpiece to be processed and the condition of the fixture, and start the machine tool to run the program for processing.