Compensation of tool deflection by dynamically adjusting the tool geometry

An operating method for a machine tool, the method comprising:

• receiving a parts program with a numerical controller of the machine tool that determines a path along which a workpiece is to be machined to remove material by a machining tool of the machine tool;
• moving a plurality of position-controlled axes of the machine tool, by which the machining tool is moved in a position-controlled manner relative to the workpiece;
• determining with the numerical controller control commands by utilizing the parts program and controlling the position-controlled axes according to the determined control commands;
• determining with the numerical controller the control commands in such a way that the workpiece is machined to remove material by the machining tool along the path according to the parts program;
• receiving in real time with the numerical controller during the machining of the workpiece by the machining tool, actual values that are characteristic of a machining force exerted by the workpiece on the machining tool during the machining of the workpiece;
• taking into consideration, with the numerical controller, the machining force during the machining of the workpiece, and determining a correction value for a geometric measurement of the machining tool as a function of the machining force;
• varying the geometric measurement of the machining tool dynamically, and in real time during the machining of the workpiece, as a function of the machining force without changing the machining tool by adding the correction value to a basic geometric measurement of the machining tool which is an initial measurement of the machining tool and known to the numerical controller and is independent of the machining force to arithmetically compensate for a deflection of the machining tool by the machining force;
• determining position setpoint values of the position-controlled axes by utilizing the parts program and the varied geometric measurement of the machining tool;
• determining control signals of the position-controlled axes based on a difference between the position setpoint values and actual position values of the position-controlled axes to move the machining tool along the path according to the parts program;
• and
• controlling the position-controlled axes with the numerical controller according to the determined control signals.