MEASUREMENT
longer a novelty,” he said. “We have done that by proving to be better than, or faster than, existing technology, which has typically been touch probes on CMMs.” This acceptance also comes at a time when there are not
only more airplanes needing to be built, but more inspec- tion required as well. “We have heard from some of our customers that the FAA is mandating up to eight times more inspections than in the past to provide in-process inspection of batches,” said Schuster. He notes that there are some turbine blade manufacturing companies that have over 100 CMMs at a single location to keep up with the demand for 100% in-process inspection. Laser Design Inc. offers the CyberGage360 3D Scan- ning and Inspection System. Powered by Laser Design’s parent company CyberOptics’ Multi-Refl ection Suppression Technology (MRS), a full 3D volumetric scan and output report can be generated in less than 3 minutes—with simply one click of a button, according to the company. For part vol- umes of 200 mm D × 100 mm L (8 × 4"), the CyberGage360
measures to a system volumetric maximum permissible error (MPe) accuracy of 10 μm + L/10,000 mm (per ISO 10360.) Accuracy specifi cations in terms of an adapted ISO stan-
dard written for CMMs equipped with touch probes can be done, but Schuster points out that such a specifi cation is not well suited for a noncontact technology. “ISO 10360 is based on measuring from point to point, but scanning measures the entire shape of the part—it measures the mating surfaces and how the part functions,” he said. What is needed, he said, is a standard methodology to measure against the ISO 17450 GD&T standard, which measures form and function. Martin from Hexagon voiced similar concerns about accu-
racy, especially in the context of MPe and large-scale scanners used for wings and fuselages. “Our Leica Absolute Scanner, for example, measures 210,000 points per second. MPe is by defi nition the accuracy of the worst point, which is quite ap- propriate for a touch probe CMM. But if I have 5 million points on a surface from a scanner, do I care about the worst out- lier?” he asked rhetorically. Other issues he noted are complex
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AdvancedManufacturing.org | February 2017
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