Abstract
Measurement of tooth root and bottom profiles is very important to analyze bending fatigue of gear teeth. But, it is hard to measure those profiles with a conventional Gear Measuring Machine (GMM), because tooth root and bottom consist of a free-formed surface and a conventional GMM is equipped with a probe to measure only with a single axis displacement. Therefore the authors try to develop a new GMM which can measure not only working flanks but also tooth root and bottom by installing a 3D scanning probe. In this paper, a problem for the measurement of helical gears is addressed and a solution is proposed. In scanning measurement of a helical gear, due to the helix angle, there is a problem that both right and left working flanks cannot be measured in the same cross-section. A new measurement strategy was applied, and the measurement was successfully carried out almost in the same cross-section.
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