Patent ID: 7610162

Claim:
A method for determining at least one space coordinate of a measurement point on a measurement object using a coordinate measuring machine (“CMM”) having a probe head arranged on a displacement mechanism comprising first and second movable supports for controling movement of the probe head along at least a first axis, comprising the steps of: conducting a calibration run of the CMM and obtaining measurement values of the displacement position of each of said first and second movable supports at a plurality of defined positions of said probe head, storing in a memory a plurality of static difference values determined in accordance with the difference in the respective measurement values for said first and second movable supports at each of said plurality of defined positions, subsequently conducting a measurement run of the CMM by approaching the measuring point with the probe head, determining a first displacement position of the first movable support and determining a second displacement position of the second movable support, determining an actual difference value between the first and the second displacement positions, determining from the static difference values stored in said memory a static difference value which represents a static difference between the first and the second displacement positions, subtracting the static difference value from the actual difference in order to obtain a dynamic difference value, correcting the first displacement position using the dynamic difference value in order to obtain a pre-corrected displacement position, and subsequently correcting the pre-corrected displacement position by using the static difference value, thereby determining the space coordinate of the measurement point.