Computer Numerical Control (CNC) machines perform functions of drilling, milling, turning, etc. CNC Mills are usually defined in terms of the number of axes they handle. Axes are generally labeled as x and y for horizontal movement and z for vertical movement. The number of axes of a milling machine is significant. A standard manual industrial mill typically has four axes: * Table x. * Table y. * Table z. * Milling Head z. A five-axis CNC milling machine has an extra axis. This axis is the basis of a horizontal pivot for the milling head. This allows a greater flexibility for machining with the end mill at an angle with respect to the table. A six-axis CNC milling machine has another horizontal pivot for the milling head, perpendicular to the fifth axis.