Patent ID: 9645217
Date: 2017-05-09
CPC Classifications: B25J,G01B,G01D,G01R,G05B

Claim:
1. A method for determining a positioning error of a computerized numerical control (CNC) machine, wherein the CNC machine is equipped with a calibration element, the calibration element being in a first position, the method comprising the steps of: reading first sensor data from at least one sensor while the calibration element is at the first position, the sensor data corresponding to a distance associated with the calibration element; operating the CNC machine to perform a calibration movement while the calibration element remains generally at the first position; reading second sensor data from the at least one sensor while the calibration element is at a second position, the second position denoting the actual position of the calibration element after the calibration movement has been performed; causing the at least one sensor to move so that the difference between the first and second sensor data decreases until the difference becomes less than or equal to a pre-determined threshold value, wherein the at least one sensor comprises or is mounted to a movement element for moving the at least one sensor; and determining a positioning error of the CNC machine based on the movement of the at least one sensor.