scope:

The geometrical accuracy of the 3 dimensional tooth form is one of the most important items to insure the performance of gears. For cylindrical involute gears, tooth form checkers are available and are widely used to fulfil this industrial and technological demand. For bevel and hypoid gears though, the development in this field is still not well done. This report explains the special items to be solved to realize the curve measurement of the tooth Bank of bevel and hypoid gears and introduce the tooth form checker that has solved these problems. The example of utilization of this checker for quality control of hypoid gears in mass-production in Japanese automotive industries to realize a quiet, final hypoid gear drive is introduced.