Abstract
In terms of the measurement accuracy of traditional CMM, a three-dimensional (3D) probe plays a great part in machine performance. However, there is few models and calibrations for 3D nonlinear and nonorthogonal scanning probe to have been published in cylindrical coordinate measuring machine (Cylindrical CMM). In this paper, a proper nonlinear model on the 3D probe is established which is based on Taylor series expansion. Moreover, an efficient calibration method is proposed to compensate not only 3D deformation of the probe but also radius of the probe tip. A high-accuracy sphere is selected as an artefact and several practical and feasible scanning paths are designed. During the calibration, optimization of the third-order model benefits from the second-order model for providing the approximate coefficient magnitudes. The proposed calibration method was experimentally carried out on an assembled four-axis CMM. Although both of the two models can reach a micron level, a compensation of the third-order model is more accurate. The correctness of the model and the efficiency of the calibration method were successfully demonstrated by probing another high-accuracy ball and the uncertainty was also analyzed.
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Acknowledgement
This research was supported by the key research project of Ministry of Science and Technology (Grant No. 2017YFB1301503).
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Yang, K., Zhang, X., Li, J., Zhu, L. (2020). An Efficient Calibration Method for 3D Nonlinear and Nonorthogonal Scanning Probe in Cylindrical CMM. In: Chan, C.S., et al. Intelligent Robotics and Applications. ICIRA 2020. Lecture Notes in Computer Science(), vol 12595. Springer, Cham. https://doi.org/10.1007/978-3-030-66645-3_1
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DOI: https://doi.org/10.1007/978-3-030-66645-3_1
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