Rotary table compensation

A Coordinate Measuring Machine (CMM) system operable to measure an object, the CMM system comprising:

• a CMM being associated with a CMM coordinate system which is fixed with respect to the CMM, the CMM comprising a computing unit and at least one sensor for a determination of 3-dimensional coordinates of an object, wherein the CMM comprises a basis being fixed with respect to the CMM coordinate system, wherein the at least one sensor being configured to measure surface variations of an object and being embodied as a tactile sensor and/or an optical sensor,
• a rotary table exhibiting means for holding an object and being associated with a part coordinate system, which is fixed with respect to the rotary table,
• a rotation arrangement attached to the basis and configured to move the rotary table into different poses with respect to the CMM by means of a rotation movement by setting different angular positions with respect to the rotation movement,
• a jig configured to be used for a determination of a 6 degrees of freedom (6 DOF) pose of the jig with the at least one sensor of the CMM, and arranged with respect to the rotary table such that a current pose of the jig is associated with a current pose information of the rotary table with respect to the CMM, wherein the jig exhibits a plurality geometrical features allowing the determination its 6 DOF pose,
• wherein the CMM system provides for a calibration procedure that defines a process in which the rotation arrangement is used to set the rotary table into multiple poses by means of rotation movement, and the calibration procedure is configured to automatically perform:
• measuring 3D coordinates of the plurality of geometrical features of the jig with the at least one sensor of the CMM for each of the multiple poses of the rotary table and, based thereof, determining a 6 DOF pose of the jig for each of the multiple poses of the rotary table,
• generating an error map with the computing unit, based on the angles associated with the different angular positions, and the associated 6 DOF poses of the jig,
• and determining with the computing unit a coordinate transformation from the CMM coordinate system to the part coordinate system, based on the error map.