Machine tool system that restricts parallel execution of predetermined operations by different tools

A machine tool that is a lathe, comprising:

• a plurality of workpiece holders configured to hold a workpiece;
• a plurality of working portions each configured to perform an operation on the workpiece, respectively;
• a plurality of working portion holders corresponding to the plurality of workpiece holders;
• and
• a control portion comprising a central processing unit (CPU) and a memory,
• wherein the control portion is configured
• to control the plurality of workpiece holders and the plurality of working portion holders so that the plurality of working portion holders hold respective working portions and the plurality of working portions perform the operations on the workpiece held by a corresponding workpiece holder, and
• to control to restrict a parallel execution of a predetermined operation and an operation to be affected by the predetermined operation and to permit a parallel operation of operations other than restricted operations,
• wherein the predetermined operation is vibration machining for cutting the workpiece by vibrating the working portion and the operation to be affected by the predetermined operation is finishing,
• wherein only the execution of the finishing where the influence of the vibration cannot be ignored is restricted while the execution of machining and operations where the influence of the vibration can be ignored is permitted, and
• wherein the machining and the operations where the influence of the vibration can be ignored comprise back machining, drilling, grooving, and transferring the workpiece.