在本刊82年第2期上曾刊登过“不连续三等分圆周直径测量”的文章。现介绍另一种测量方法,它可以测量任意奇数等分的不连续圆周直径。如图所示,所测零件放在V形块的V形槽内,无论零件的圆心O是高于还是低于V形块的上平面A(图上所示为低于上平面的例子)均可得如下的几何关系 In this issue of 82, No. 2 on the issue of “discontinuous third equal circumference diameter measurement” article. An alternative measurement method is presented that measures discrete circumferential diameters of any odd number. As shown, the part to be measured is placed in the V-groove of the V-shaped block regardless of whether the center O of the part is above or below the upper plane A of the V-block (an example below the upper plane is shown) Can get the following geometric relationship