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around corners, and inside hole features,” said O’Reilly. All points measured are put in the same reference frame. They can be referenced to CAD as well. The company advertises Tracker accuracy as 0.0014" (0.035 mm) with a range 230' (70.1 m) and arm accuracy 0.0005" to 1' (0.013 mm–0.3 m) for the combined system. For noncontact measurement of smaller parts and surfaces, FARO has the ScanArm HD device that uses a laser line probe to measure up to 560,000 points per second. Within a 1.8-m volu- metric measuring range, its accuracy is 34 µm (per ASME B89.4.22). Using a blue line laser im- proves signal-to-noise ratio and a new crosshair feature for the LED rangefi nder improves usability.
Noncontact Accessories There are other issues for measuring with laser trackers besides line-of-sight. “When you measure
The Creaform MetraSCAN 3D used with its C-Track dual-camera tracker can provide a fl exible, 6 degree-of-freedom solution for large part metrology.