CNC 4-axis milling involves the same milling use in 3-axis machining, where a cutting tool is used to remove material from a piece to create the desired shape and profile.

In the case of 4-axis machining, however, milling is performed on an additional axis that rotates around the Z-axis. This is called the “A-axis.”

CNC 4-axis milling is useful when holes and cut-outs need to be made in the side of a piece or around a cylinder. This process provides quick and efficient results based on computer numerical data that creates precise results.