Machine tool

A work processing method in a machine tool having:

• a spindle rotating around a Z-axis extending in a horizontal direction;
• a tool post disposed in a movable manner in the Z-axis direction and an X-axis direction orthogonal to the Z-axis direction and in a pivotable manner around a B-axis orthogonal to a plane face containing the X-axis and the Z-axis;
• and
• a tool including a pair of tips disposed to have a predetermined interval therebetween and fitted to said tool post, comprising:
• a processing step processing the work in a state where the pivot angle of said tool post is adjusted so that the angle α formed by the straight line connecting the pair of tips and the Z-axis comes to the angle corresponding to the finished thickness of the work;
• and
• a stand-by step returning to a stand-by position while it is in the state where the pivot angle of said tool post is adjusted so that the angle α after the processing is smaller than the angle in the course of said processing step.