To program a CNC lathe, you need to understand the part you’re fabricating and its measurements. Then, create the design with CAD software, identifying the tool paths. This design is then converted into G-code, the language CNC machines understand, by CAM software. Import the G-code into the CNC lathe. Run a simulation to verify the program. Make adjustments if necessary, then execute the program. Monitor the process to ensure accuracy. Proper training is required to accurately and safely program a CNC lathe.