Graphics, interpolation turning, and gear hobbing capabilities of TNC 640 extend applicability to machining of large parts for power plants. CAD viewer supports .Step, .Iges, and .Dxf files and lets operator evaluate workpiece at control. For machine builders, M3D converter enables DCM (Dynamic Collision Monitoring). Other features include Cycle 880, for gear hobbing of external cylindrical and helical teeth, and manual probing function for determining 3D basic rotation for plane surface.