大家知道用分组量法(又叫跨齿量法)测量齿轮周节累积误差(△t_∑)能获得较高的测量精度。它特别适用于齿数多的精密齿轮,或齿数虽不多,但其要求的精度较高而采用一般单齿测量法的精度已显得不够时(例如在万能测齿仪上测量高精度的插齿刀)。这种方法是以每组跨测 n 个齿,将被测齿的齿数 z 分为 M组进行测量,即 We all know that using grouping method (also known as cross-tooth method) to measure the cumulative error of the gear circumference (△ t_Σ) to obtain higher measurement accuracy. It is especially suitable for precision gear with many teeth, or the number of teeth is small, but its accuracy is high and the accuracy of general single tooth measurement is not enough (for example, measuring the precision gear Knife). This method is to test each group spanning n teeth, the tooth count z teeth divided into M group to measure, that is