Abstract
This paper introduces a new method to measure tooth profile error of minute module gears. In this method, regarding the surface of a gear as a sort of surface roughness, the optical cutting method is applied. Because the tooth depth of the gear here aimed to measure is very low, this method can be expected to be applied availably. To ensure the ability of this method, a measuring apparatus which employs a CCD camera as an observing device was constructed. The optical cutting image of the tooth observed by the CCD camera is led to a computer and the tooth profile is presented with a fine line image processing. By comparing it with a calculated ideal profile, the tooth profile error can be obtained. Measurements for a gear with the module of 0.2 are carried out successfully, in which a resolution is estimated to be about 1.1 μm in Y direction and 1.6 μm in X direction and standard deviations of repeatedly measured values are about 3 μm. Besides, some factors generating measurement errors are pointed out and discussed for developing this method better. As a consequence it becomes clear that the method has a good ability to measure total profile error of minute module gears.
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