A CNC vertical machining center (VMC) with an automatic pallet changer (APC) is a type of computer numerical control (CNC) machine tool that is capable of performing a wide range of machining operations on a vertical plane. The addition of an automatic pallet changer (APC) enables the machine to automatically change the workpiece pallet without the need for manual intervention.

The APC is a system that allows for the automatic swapping of workpieces or tools, this enables the machine to work on multiple jobs or tasks without stopping the machining process. The APC can be integrated into the CNC control, allowing it to be programmed to change the pallets at specific intervals or points during the machining process. This improves the overall efficiency and productivity of the machine by reducing downtime and allowing for unattended operation.

A VMC with APC machine typically features a spindle that moves in the Z-axis direction and a table that moves in the X and Y axes. The machine can handle a wide range of materials such as metals, plastics, and composites, and can be used for drilling, milling, boring, tapping and other machining operations. It is capable of performing a wide range of operations, including drilling, tapping, boring, and milling. They are mostly used in industrial settings for precision and high-volume production, and can also be used for prototyping and low-volume production work.