CNC is short for Computerized Numerical Control. Compared to normal milling process, CNC machine is equipped with the ability to move its spindle vertically along the Z-axis, which enables it to machine complicated parts based on one-time fixation. CNC machining is famous for high precision and stable quality, which is a good choice to those parts with critical dimensions for mounting. Certainly, the machining cost of CNC is much higher than normal milling process.