Abstract: Complex machining such as lathe machining and milling including non-circular machining is effected by a single machine tool effectively and highly accurately.The machine tool comprises a spindle stock having the C-axis control function, a carriage which can be moved and positioned in a direction of the axis of a main spindle, and two tool rests installed on the carriage. Lathe machining and milling are performed by the first tool rest, and non-circular machining is performed by the second tool rest. A tailstock can be also moved in the direction of the main spindle axis, and positioning of the movable members is controlled by an NC device. A force for supporting a workpiece is controlled by a chuck and a tailstock spindle in response to an M function command.
Abstract: A machine tool for processing a work piece into a non-circular cross-sectional configuration according to the invention precisely processes, for example, a piston cylinder into a non-circular cross-sectional configuration by inputting simplified data.That is to say, a tool thereof is moved in a direction (X axis) perpendicular to an axis of the work piece by means of two servo motors. A first X axis servo motor operates to position the tool roughly in the X direction according to the size of the work piece. A second X axis servo motor finely vibrates the tool at high speed on the basis of program data.