HELICAL GEAR MEASUREMENT USING STRUCTURED LIGHT

J. Peters, G. Goch, A. Günther

Abstract

Today, profiles of involute gears are measured with conventional or specialized coordinate measuring devices. The measuring speed of such instruments decrease with an increasing density of measuring points. Therefore, coordinate measuring devices often scan only a few lines of the gear surface. But these profiles represent only partially the functional behavior of the gear. This contribution describes a method, which measures the complete surface of a tooth in only a few seconds. A structured light pattern is directed towards the tooth. A CCD-camera records the stripes, deformed by the interaction between the surface and the light pattern. An algorithm transforms the registered graylevel patterns together with the system design data and the calibration information into the 3D-coordinates of the gear surface. At a measuring area of a few cm², the resolution amounts to about 1 µm. A 3D system calibration discussed in this paper aims at an improvement of the measuring uncertainty. Finally, first results of helical gear measurements are presented.

Keywords

gear measurement, helical gear, structured light, fringe projection, 3D calibration

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IMEKO-WC-2000-TC14-P392.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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