Evaluation of a multi-sensor horizontal dual arm Coordinate Measuring Machine for automotive dimensional inspection |
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Authors: | Glen A Turley Ercihan Kiraci Alan Olifent Alex Attridge Manoj K Tiwari Mark A Williams |
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Affiliation: | 1. WMG, The University of Warwick, Coventry, CV4 7AL, UK 2. Jaguar Land Rover Limited, Abbey Road, Whitley, Coventry, CV3 4LF, UK 3. Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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Abstract: | Multi-sensor coordinate measuring machines (CMM) have a potential performance advantage over existing CMM systems by offering the accuracy of a touch trigger probe with the speed of a laser scanner. Before these systems can be used, it is important that both random and systematic errors are evaluated within the context of its intended application. At present, the performance of a multi-sensor CMM, particularly of the laser scanner, has not been evaluated within an automotive environment. This study used a full-scale CNC machined physical representation of a sheet metal vehicle body to evaluate the measurement agreement and repeatability of critical surface points using a multi-sensor horizontal dual arm CMM. It was found that there were errors between CMM arms and with regard to part coordinate frame construction when using the different probing systems. However, the most significant effect upon measurement error was the spatial location of the surface feature. Therefore, for each feature on an automotive assembly, measurement agreement and repeatability has to be individually determined to access its acceptability for measurement with a laser scanner to improve CMM utilisation, or whether the accuracy of a touch trigger probe is required. |
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