The measurement of the gear bar is converted to the common normal length measurement

In the involute gear processing drawings, the processing precision of the gears of the even-numbered teeth is sometimes specified, and the diameter of the equivalent rod is small, and when the tolerance is high, the processing rod is inconvenient. Moreover, some milling workers are accustomed to grasping the amount of feed of the hob by measuring the common normal line, and feel awkward to use the measuring rod. The following example shows how to convert the bar measurement in gear machining to the measurement of the length of the common normal. In order to improve the matching precision of the bushing and the half shaft in a certain shaft clutch, it is necessary to machine two involute spline shafts as the shaft.

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