Abstract
This paper describes a basic analysis on accuracy inspection of involute cylindrical gears on a CNC type of gear grinding machine. The measurement principle of the present method consists of four steps which include: (1) feeding a touch-trigger probe fixed on the grinding head to a suitable position relative to the measured gear set on the table of the grinding machine; (2) rotating the table to contact the probe with the gear surface; (3) memorizing the rotation angle of the table at the contact position in NC apparatus of the grinding machine and then stopping the table movement; (4) repeating the measuring process for every measurement point in the gear surface. A simple and practical algorithm for computing the various gear errors, such as the errors of the tooth profile, the tooth trace, the pitch and the tooth thickness, based on the memorized data is established. The influence factors on measurement accuracy and their sensitivity coefficients are shown. This method is also applied for the other types of CNC gear cutting machine if the rotation angle of the table can be memorized.
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