由于普通卡尺的卡脚较短,工件直径较大时无法测量,用如图所示的方法可以解决这个难题,而且用小卡尺可以测量较大直径的工件。 图中OA=r(工件半径),AB=c(弦长),CD=h(弦高)。弦高h等于卡尺卡脚的高度,对于所用卡尺来说是一个常量。弦长c可以从卡尺上读出。根据如下公式可以求出工件的半径r Due to the short caliper of ordinary calipers, the workpiece can not be measured when the diameter of the workpiece is larger. The method as shown in the figure can solve the problem, and a small caliper can measure larger diameter workpieces. Figure OA = r (workpiece radius), AB = c (chord), CD = h (chord height). The chord height h is equal to the caliper caliper height and is a constant for the caliper used. Chord length c can be read from the caliper. According to the following formula can find the workpiece radius r