Numerically-controlled machine tool

A numerically-controlled machine tool comprising:

• a main spindle to which a tool is detachably attached and which is configured to rotate the tool;
• a table configured to fix and support a workpiece;
• tool measuring means for measuring a length and a diameter of the tool attached to the main spindle;
• workpiece measuring means for measuring a three-dimensional shape, a position, and an orientation of the workpiece fixed and supported onto the table in a non-contact manner;
• and
• controlling means for finding a position of a machining start point and an inclination of a reference plane on the basis of information from the workpiece measuring means, then controlling an action of at least one of the main spindle and the table in such a manner as to perform machining on the workpiece on the table on the basis of an inputted machining program while using information from the tool measuring means and the workpiece measuring means as well as the position of the machining start point and the inclination of the reference plane, and controlling an action of at least one of the main spindle and the table in such a manner as to move the tool relatively to the workpiece at a faster speed than a relative moving speed of the tool defined in the machining program when the tool is located in a non-machining region where the tool moves relatively to the workpiece without being in contact with the workpiece.