如下图所示工件的两组对称孔(φ45_0~(+0.025)所形成的夹角θ_1和θ_2对称与否,角度交点至F面的垂直距离x是该工件的重要几何尺寸,应作精密测量。其测量方法介绍如下: 1.用分度值为2′的万能角度尺分别测出工件左、右两孔共面的角度。 2.用三个可调活动支承架将导向座支承 As shown in the following figure, the angles θ_1 and θ_2 formed by the two symmetrical holes (φ45_0 ~ (+0.025)) of the workpiece are symmetrical or not. The vertical distance x from the intersection of the angle to the F surface is the important geometric dimension of the workpiece and should be measured accurately The measurement methods are described as follows: 1. Use the omnipotence angle scale of 2 ’to measure the coplanar angle of the left and right holes of the workpiece respectively. 2. Support the guide base with three adjustable movable support frames