Control device for machine tool and machine tool including the control device

A machine tool having:

• a cutting tool for cutting a workpiece, a rotating unit for rotating the cutting tool and the workpiece relative to each other;
• a feeding unit for feeding the cutting tool and the workpiece in a predetermined feed direction;
• a vibration unit for reciprocally vibrating the cutting tool and the workpiece relative to each other;
• and
• a control device having:
• a numerical value setting section configured to set values of two parameters from the group consisting of a number of rotations of the cutting tool and the workpiece relative to each other, a number of vibrations of the reciprocal vibration per rotation of the cutting tool and the workpiece relative to each other, and a vibration frequency dependent on a period in which the control device can execute an operating instruction when the workpiece is machined;
• and
• a control section for making the machine tool machine the workpiece via rotation of the cutting tool and the workpiece relative to each other, and via the feeding of the cutting tool to the workpiece with reciprocal vibration of the cutting tool and the workpiece relative to each other by the vibration unit, for setting the remaining one of the said parameters to a predetermined value, and for correcting the values of said two of the parameters set by the numerical value setting section in dependence on the value of the remaining one of said parameters.