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Experimental evaluation of a vision-based measuring device for parallel machine-tool calibration

In this article, an evaluation of a vision-based measuring system for parallel machine-tool calibration is performed. Simultaneous measurement of the 6 pose components enables one to perform calibration using the efficient inverse kinematic method. The system is composed of a single camera and a calibration board generated on a LCD monitor. Calibration board size can be adapted to the camera field of view, and specific points of interest can be generated, in order to improve pose measurement. Based on a single industrial camera, the measuring system is low-cost and easy-to-use. An experimental evaluation of the system is performed on a machine-tool axis. Measurement bias and precision are estimated by comparison with laser interferometry, and the influence of focal length and sensor resolution is examined.