The new Optimized Contour Milling (OCM) option for the HEIDENHAIN TNC 640 gives you nearly unlimited trochoidal milling capability from the convenience of the shop floor. After you define the contour on the control, the TNC 640 automatically calculates the best trochoidal milling strategy. With highly efficient trochoidal milling for any pocket or island, you enjoy greater throughput and less tool wear.