In the manufacturing inspection of involute spur gears and splines, it is often used to measure the arc tooth thickness by using the bar spanning. The choice of the diameter of the roller is not consistent, there are errors. In practice, we use the following method to solve the optimal roller diameter. Calculation of Roller Diameter When measuring the thickness of the arc tooth with a roller, the roller should be on the indexing circle or near the indexing circle. If the diameter of the roller is too large, the roller will leave when measuring. Open line profile,
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