A 4-axis CNC system is an automated control system that manages machine tool movements across four independent axes of motion. The system incorporates three linear axes (X, Y, and Z) along with one rotary axis, typically designated as the A, B, or C axis, which enables rotational movements around the respective linear axes. This additional rotary capability allows for more complex machining operations compared to three-axis systems, including angular cuts and multi-sided component fabrication. The 4-axis CNC operates through a computerized controller that interprets CAD/CAM programming instructions and converts them into precise motion commands. The system uses interpolation techniques to synchronize all four axes simultaneously, ensuring accurate tool positioning and smooth contoured movements. A dedicated CPU performs real-time mathematical calculations to coordinate motion control, while feedback systems—typically using encoders or sensors—monitor actual axis positions and adjust movements to maintain accuracy. The control system manages multiple functions including axis motion generation, spindle speed control, coolant activation, and tool changes. Motion is driven by stepper motors or servo motors connected through a fieldbus to the CNC controller, enabling deterministic communication and precise tool path execution. Commercial 4-axis machines typically employ closed-loop feedback controls to verify that programmed movements occur correctly and detect anomalies during operation. Four-axis CNC machines are particularly valuable for producing complex parts requiring rotational positioning, offering enhanced versatility over three-axis systems while maintaining high precision and repeatability in both prototype and production environments.