电机轴在加工前需要划线打中心孔,一般采用“四心法”近似地找准中心。此法不仅慢而且不准确.我们利用“垂直平分弦的直线必过圆心”的原理.制成一种定心尺,如图1所示.使用时将尺上的两个直径10mm 圆柱紧靠轴的外圆,用划针沿尺 Need to mark the center axis of the motor shaft before machining, the general use of “four heart method” to pinpoint the center. This method is not only slow and inaccurate, we use the principle of “vertical bisector of the line will be over the center ” made of a centering ruler, as shown in Figure 1. When used on the ruler of the two diameter 10mm cylindrical Close to the shaft of the outer circle, with the needle along the ruler