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Development of an alignment process for raw parts based on photogrammetry for the machining of large components

Development of an alignment process for raw parts based on photogrammetry for the machining of large components
(1) portable photogrammetry with commercially available and low-cost digital cameras for the dimensional control of the blank workpiece outside the machine, and (2) portable stereophotogrammetry integrable into the milling machine tool head for the automated measurement of the position and orientation of the workpiece during its alignment in the machine.

Based on the potential offered by photogrammetry for having redundant information in the images of the same measurement process, the main knowledge proposal of this work involves the development of in-process computationally efficient self-calibration techniques, and to demonstrate their validity for the effective compensation of significant measurement error sources in each one of the photogrammetric measuring devices, thus preventing the need to adopt specific calibration processes for their compensation. The proposed solution is evaluated in both laboratory and industrial scenarios to demonstrate its validity for dimensional control of excess material tolerances of ± 1 mm on workpieces with a volume greater

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