图1所示是我厂生产的球铰零件,要求保证球的中心至端面的距离L或L_2。我们设计了图2所示的带表测具,测量时,以D_1定位,用螺母2压紧,将被测件固定,然后用手移动表杆7,找准零件球D的中心,拧紧止动螺钉6,再用专用塞片测得E尺寸,根据E及L_1可测得L值。核检具要求表杆7上的表头孔φ8 Figure 1 shows the ball joint parts produced by our factory. It is required to ensure the distance from the center of the ball to the end face L or L_2. We designed the table with the measuring tool shown in Figure 2, the measurement to D_1 positioning, with the nut 2 pressed, the test piece is fixed, and then manually move the table lever 7, find the center of the ball part D, tighten until Move the screw 6, and then use the special plug measured E size, according to E and L_1 can be measured L value. The test fixture requires a gauge hole φ8 on the gauge rod 7