Patent ID: 8419324

Claim:
A method for controlling a tool during machining a work piece with the tool, comprising using a first measuring arrangement having a first ultrasonic probe for emitting ultrasonic waves, the first measuring arrangement being arranged ahead of the tool with respect to a relative tool movement direction and being moved relative to the work piece in the relative tool movement direction, transmitting ultrasonic waves emitted by the first ultrasonic probe to the work piece, and transmitting the ultrasonic waves that have been transmitted to the work piece back to the first ultrasonic probe using a first column of liquid which is created by the first measuring arrangement and is situated between the first ultrasonic probe and the work piece for measurement, using a measurement obtained by the first measuring arrangement for automatically adjusting a position of the tool relative to the work piece during machining the work piece, using a second measuring, arrangement having a second ultrasonic probe for emitting ultrasonic waves, the second measuring arrangement being arranged after the tool with respect to the relative tool movement direction and being moved relative to the work piece in the relative tool movement direction, transmitting ultrasonic waves emitted by the second ultrasonic probe to a machined surface of the work piece that has been machined by the tool and back to the second ultrasonic probe by means of a second column of liquid which is created by the second measuring arrangement and is situated between the second ultrasonic probe and the machined surface, and using the measurements obtained by the second ultrasonic probe for automatically adjusting the position of the tool relative to the work piece during machining the work piece.