Ivoclar Vivadent Ag

Christian Seiler

Gottfried Rohner

The invention relates to a system of a method for controlling a machine tool, and a workpiece, in particular a milling blank, and the method for machining this workpiece, said machine tool comprising a robot arm movable in at least 2, in particular at least 3 spatial axes in a range of motion, said robot arm carrying, guiding and moving at least one workpiece, possibly by means of a workpiece holder, with a control unit for controlling the machine tool. The machine tool () comprises a sensor, in particular a spatially fixed optical sensor or is assigned said sensor, whose detection range () at least partially overlaps the range of motion. The workpiece () comprises a change in geometry, in particular a hole (), is moved in the detection range () by the robot arm (), and upon detection of the hole () by the sensor the control unit determines a reference point, reference axis and/or reference surface for controlling the machine tool ().

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Zurich, Switzerland

Christian Seiler