对于重要的轴,轴上键槽不仅有尺寸公差要求,还有位置精度要求,如图1所示的100系列柴油机曲轴上的键槽部位。目前键槽对轴颈的不对称,一般是用百分表找正轴颈中心线和键槽的侧面,得出偏差值。这种方法是很费时间的,被检工件必须从夹具上卸下才能检测,所以在实际生产中往往因为操作不便,而难以做到逐件检查。本文介绍一种简易的测量方法,如图2所示。量具共有三个元件,其中1为90°V形块,测量时放在 For important shafts, shaft keyways not only have dimensional tolerance requirements, but also position accuracy requirements, as shown in Figure 1 on the 100 series diesel engine crankshaft keyway. At present the keyway asymmetry of the journal, the general is to use the dial indicator to find the journal centerline and the keyway side, come to the deviation value. This method is very time-consuming, the workpiece to be seized must be removed from the fixture to detect, so in actual production often because of the inconvenience, and difficult to do one by one inspection. This article describes a simple measurement method, as shown in Figure 2. There are three components of the gage, of which 1 is 90 ° V-shaped block, placed on the measurement