Machining centers are machine tools that automatically perform multiple cutting processes such as milling, drilling, and tapping on a single machine, based on numerical control (NC). Equipped with an automatic tool changer (ATC), they significantly reduce setup time and consolidate multiple processes into one machine by instantly switching between a wide variety of tools. This enables the efficient machining of high-precision and complex-shaped parts. Their main applications are diverse, including automotive parts, aerospace components, medical devices, and mold manufacturing. There are various types, such as vertical, horizontal, and 5-axis, capable of accommodating a wide range of production forms, from high-mix low-volume production to mass production. They are essential core equipment for modern manufacturing, contributing to improved productivity, stabilized quality, and reduced costs.