CNC mills can perform the functions of drilling and milling. The CNC Mills at PDC are controlled by sophisticated network of computers. The 3D mold file is converted into surfcam file which plots the 3D mold on an x, y, and z graph. Giving cooridinates to the required cuts. These coordinates control the CNC Mills according to the axes that they possess. Axes are labeled as x and y for horizontal movement, and z for vertical movement.