An Automatic Tool Changer (ATC) and an Automatic Workpiece Changer (AWC) are both features found on some CNC machines, but they serve different functions.

An ATC is a mechanism that allows the machine to automatically change cutting tools during the machining process. It typically consists of a tool carousel or magazine that holds multiple tools, and a robotic arm or other mechanism that can select and replace tools as needed. The ATC enables the machine to perform different types of cutting operations without requiring manual intervention, which can save time and increase efficiency.

On the other hand, an AWC is a mechanism that allows the machine to automatically exchange workpieces without requiring manual intervention. It typically consists of a robotic arm or other automated mechanism that can pick up a workpiece from a storage location, such as a pallet or tray, and place it onto the machine’s worktable. Once the machining operation is complete, the AWC can remove the finished workpiece and replace it with a new one, allowing the machine to operate continuously without manual intervention.

In summary, an ATC is used to change cutting tools during the machining process, while an AWC is used to exchange workpieces automatically. Both features can help to increase productivity and efficiency in CNC machining, but they serve different functions.