Patent ID: 9212888
Filing Date: 2015-12-15
Classification: G01B

Abstract:
1. A method of compensating for measurement errors of a measuring machine deriving from deformations of a machine bed of the measuring machine caused by a load exerted by a workpiece to be measured on the machine bed, the method comprising: a profiling step forming a defined set of standard load conditions, each load condition of the defined set of standard load conditions corresponding to a predetermined mode of resting of the workpiece on the machine bed, the profiling step further comprising applying a predetermined load on predetermined points of the machine bed to form predetermined basic load conditions; an acquisition step in which data regarding a measured weight of the workpiece and a measured mode of resting of the workpiece on the machine bed representing a number and positions of points or areas of resting of the workpiece on the machine bed are acquired by a measurement and control unit of the measuring machine; said acquisition step further comprising selecting a selected standard load condition from the defined set of standard load conditions, the selected standard load condition representing a load of the workpiece on the machine bed corresponding to the measured weight of the workpiece and the measured mode of resting of the workpiece; a calculation step in which calculated correction values depending upon said measured weight of the workpiece and the measured mode of resting of the workpiece are calculated by said measurement and control unit; and said calculation step comprises calculating values correlated to the deformations of the machine bed under the load of the workpiece represented by the selected standard load condition as a linear combination of corresponding values of the predetermined basic load conditions.