Machining method and machining system

A machining system comprising a machining device for machining an elongated workpiece supported horizontally and a non-contact measuring device for measuring the deflection of a workpiece to be machined by the machining device,

• the machining system characterized in that:
• the machining device has end portion supporting means for supporting both end portions of the workpiece horizontally, middle portion supporting means for supporting the middle portion of the workpiece supported by the end portion supporting means, adjustment means for adjusting the height position of the middle portion supporting means and thereby adjusting the workpiece supporting position in the vertical direction of the middle portion supporting means, rotation drive means for rotating the workpiece supported by the supporting means about its axis, tool holding means which is provided so as to be movable in three orthogonal directions, a Z-axis parallel to the axis of the workpiece, an X-axis orthogonal to the Z-axis, a Y-axis orthogonal to both of the Z-axis and X-axis, and holds a tool, feed means for moving the tool holding means, and control means for controlling operations of the adjustment means, rotation drive means and feed means;
• the non-contact measuring device has a measuring head which is configured so as to be attachable to and detachable from the tool holding means and measures, without contact, the distance between the measuring head and the outer peripheral surface of the workpiece being supported by the supporting means and being rotated by the rotation drive means at a rotational speed for when the workpiece is machined, and deflection amount calculating means for calculating the deflection amount of the workpiece at the portion thereof supported by the middle portion supporting means on the basis of the distance measured by the measuring head and the position of the tool holding means when said distance was measured which is obtained from the control means;
• and
• the control means controls the adjustment means on the basis of the deflection amount calculated by the deflection amount calculating means, thereby adjusting the height position of the middle portion supporting means so that the height positions of both end portions of the workpiece being rotated and the height position of the middle portion thereof become the same.