Rough to finish machining of a large workpiece of 760 x 600 x 475.
Surface roughness of the contoured section is Rz=2-4µÃO. Such a high quality machined surface is difficult to achieve in ordinary machining.
 This plastic mold is a work of art--a combination of Okuma's highest technology and a highly acccurate machine with almost no thermal deformation, based on the "Thermo-Friendly Concept," and "high-speed contouring control Super-NURBS," which greatly advanced the innovative technology of Hi-NC that began with tolerance control which Okuma led the world in developing in 1987.

Even with pieces requiring multi-sided machining, processes can be brought together with the introduction of a 5-axis machine. This makes it possible to greatly reduce lead time. Moreover, when machining curved surfaces with a ball end mill, a high quality machined surface can be achieved by changing the gradient angle and using a peripheral cutting edge with high circumferential speed. The curved surfaces of artificial joints are machined by changing the indexing angle, and it is very important to make smooth connections in the sections linking the surfaces of each angle. This machined part has step differences of a mere 3 µm.

An ultra-precision machine is essential for mirror finishing. Surface roughness of less than Ry=0.2µÃO (less than one-fourth the wavelength of visible light) is demanded, requiring huge capital investment, including that for the environment in which the machine will be placed. Okuma is conducting trials to see the level of mirror finishing that is possible with a highly accurate machine based on a general purpose machining center (in a general temperature environment). The current data are shown here. In this way, Okuma is pushing the technical limits under common constraints to meet a wide range of user needs.