Machine tool with calibration device for calibrating a meshing sensor

A machine tool for machining pre-toothed workpieces, comprising:

• a workpiece carrier;
• workpiece spindle arranged on the workpiece carrier and defining a workpiece spindle axis, the workpiece spindle having a workpiece spindle housing and a workpiece spindle shaft rotatable in the workpiece spindle housing about the workpiece spindle axis for rotationally driving a pre-toothed workpiece to be machined;
• a meshing sensor configured to detect a phase position of teeth of the workpiece when the workpiece rotates about the workpiece spindle axis,
• wherein the machine tool further comprises:
• a calibration piece located at a defined calibration point relative to the workpiece spindle;
• and
• a sensor controller configured to carry out the following method:
• moving the meshing sensor relative to the workpiece spindle to a calibration position in which the meshing sensor is located at the calibration piece;
• determining a response behavior of the meshing sensor by the sensor controller moving the meshing sensor relative to the calibration piece while receiving sensor calibration signals of the meshing sensor, and
• moving the meshing sensor to a workpiece measuring position in which the meshing sensor is located at the workpiece, wherein the workpiece measuring position depends on the determined response behavior.