Machining method and machining system

A machining system comprising a machining device for machining the outer peripheral surface of 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, rotation drive means for rotating the workpiece supported by the end portion 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 and parallel to the vertical direction, a Y-axis orthogonal to both of the Z-axis and the X-axis, and holds a tool, feed means for moving the tool holding means, and control means for controlling the rotation drive means and the 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 which measures, at a plurality of measurement positions set in the Z-axis direction, without contact, the distance between the measuring head and the outer peripheral surface of the workpiece being supported by the end portion supporting means and being rotated by the rotation drive means at a rotational speed for when the workpiece is machined, and deflection shape calculating means for calculating the deflection shape of the workpiece on the basis of the distances measured by the measuring head at the measurement positions and the positions of the tool holding means when the distances were measured which are obtained from the control means;
• and
• the control means moves the tool along the deflection shape calculated by the deflection shape calculating means.