Abstract
The system of accuracy for cylindrical gears has been defined in JIS B 1752 and ISO 1328, and the accuracy of gears has been expressed in terms of individual errors such as the pitch error, the tooth profile error, the eccentricity, etc. Each of these methods, however, is not satisfactory to express the accuracy of gears such as the angular transmission error and tooth bearing error. A new gear accuracy measuring system with micro-computer is proposed. Many points on the tooth profile of gears are measured according to the three coordinate systems, and the micro-computer calculates the tooth error by comparing the results with the theoretical values. By illustrating the tooth errors around the gear teeth with the arc of base circle, the accuracy of gear is more adequately expressed than by any of the conventional methods.
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