Machine Tool System and Method of Controlling Machine Tool System

A machine tool system comprising:

• a spindle capable of gripping a bar and moving back and forth in an axial direction of the bar;
• a tool post to which a machining tool is attached, the machining tool machining the bar gripped by the spindle;
• the machine tool system capable of manufacturing a plurality of products having an identical shape from the bar by repeating a machining of the bar, a cutting off of a machined portion of the bar, and a grip change by the spindle, the grip change by the spindle comprising releasing the bar, moving back, and re-gripping the bar at a predetermined gripping position, and
• the machine tool system further comprising a gripping position selecting unit capable of selecting a special gripping position at which the spindle re-grips the bar when a state of the machine tool system meets a predetermined condition, the special gripping position being different from the predetermined gripping position.