Method for dynamically compensating angle errors when operating a machine tool, and a machine tool operable with such a method

A method for dynamically compensating angle errors when operating a machine tool that comprises at least one fixture for a workpiece, in or on which the workpiece is securable, at least one toolholder, in or on which a tool is securable and can be rotationally driven by a rotational drive of the at least one toolholder, the rotational drive comprising at least one horizontal drive by which the at least one toolholder is able to execute movements in at least one horizontal plane of the machine tool, the machine tool further comprising at least one vertical drive by which the at least one toolholder is able to execute movements in a vertical direction of the machine tool, and at least one controller connected to the rotational drive, the at least one horizontal drive, and the at least one vertical drive, the method comprising the steps:

• advancing the rotationally driven tool to machine the workpiece into the workpiece along an advancing direction extending in the at least one horizontal plane or diagonally to the at least one horizontal plane;
• extracting the rotationally driven tool from the workpiece along an extraction direction opposite to the advancing direction, and recording an actual position of the at least one toolholder in the vertical direction and an actual value of a force and/or acceleration pilot control value of the rotationally driven tool in reference to a Z-axis extending in the at least one horizontal plane;
• determining an angle error of the rotationally driven tool as a function of the actual value of the force and/or acceleration pilot control value of the rotationally driven tool in reference to the Z-axis extending in the at least one horizontal plane;
• determining a compensation value of the at least one toolholder in the vertical direction to compensate the determined angle error and transitioning the at least one toolholder from the actual position to a target position by the determined compensation value.