Machine tool

A machine tool configured to hold a workpiece having a flat surface and a curved surface opposed to the flat surface with the flat surface disposed horizontally, one end of the curved surface being closer to the flat surface than is another end of the curved surface in a vertical width plane that includes a workpiece width direction, and the machine tool configured to perform machining on the curved surface, characterized in that the machine tool comprises:

• a first machining head to which a first rotary tool configured to perform machining on the curved surface is rotatably attached;
• a first saddle which moves the first machining head in direction of a longitudinal axis of the first rotary tool;
• and
• a first cross rail which is provided such that a longitudinal axis of the first cross rail is inclined with respect to the flat surface and with respect to a vertical direction in the width plane at a first inclination angle, and which first cross rail supports the first saddle in such a way that the first saddle is movable in an inclination direction along the longitudinal axis of the first cross rail that is at the first inclination angle, and
• the curved surface is formed to be inclined with respect to the flat surface and with respect to a vertical direction at a predetermined second inclination angle in a vertical longitudinal plane that extends in a longitudinal direction of the workpiece, which longitudinal plane is orthogonal to the vertical width plane, and
• the machine tool is provided with:
• a pair of left and right first beds, left and right being with respect to the width plane, the pair of left and right first beds each having a respective guide surface, each of the guide surfaces being inclined in an inclination direction at the second inclination angle in the longitudinal plane;
• and
• a pair of left and right moving members, left and right being with respect to the width plane, each of the left and right moving members being supported on a respective one of the guide surfaces to be movable in the inclination direction of the guide surfaces, and which moving members support the first cross rail between upper ends of the moving members with the first cross rail inclined at the first inclination angle, such that the first cross rail moves linearly in the inclination direction of the guide surfaces, and wherein the upper ends are set at different heights.