Control method for a machine tool with numerical control

A method for controlling a machine tool, comprising:

• Providing a machine tool, comprising:
• a machining head,
• an adjustment device to create a relative displacement between the machining head and a workpiece,
• a sensor assigned to the adjustment device to detect its adjustment movements, and
• an additional sensor to create a state variable based upon a relative displacement between the machining head and the workpiece;
• determining a value for the relative displacement based upon signals of the sensor assigned to the adjustment device and based upon the state variable;
• and
• controlling the adjustment device based upon the value of the relative displacement of the machining head to the workpiece.

A machine tool comprising:

• a machining head;
• an adjustment device to create a relative displacement between a machining head and a workpiece;
• a numerical control to control the adjustment device based upon a value of the relative displacement of the machining head to the workpiece;
• a sensor assigned to the adjustment device to detect adjustment movements of the adjustment device;
• an additional sensor to create a state variable based upon a relative displacement between the machining head and the workpiece;
• and
• a value for the relative displacement between the machining head and the workpiece determined based upon signals of the sensor assigned to the adjustment device and based upon the state variable.

A laser machine tool comprising:

• a beam guidance device;
• a beam focusing device;
• a laser source to create a relative displacement between the beam guidance and focusing devices and a workpiece;
• a numerical control to control the beam guidance and the beam focusing device based upon a value of the relative displacement of the laser source to the workpiece;
• a sensor assigned to the laser source to detect adjustment movements causing displacements;
• an additional sensor to create a state variable based upon a relative displacement between the beam guidance and focusing devices and the workpiece;
• and
• a value for the relative displacement between the beam guidance and focusing devices and workpiece determined based upon signals of the sensors assigned to the laser source and based upon the state variable.