在长度测量中,有时遇到两段圆弧间距离L的测量问题,如图1所示。这时可以用卧式测长仪进行测量。具体操作如下: 1.根据被测件的圓弧半径R_1和R_2选择适当半径的球形测头(就是仪器附件中测内螺纹中径的测球); 2.将测球按与内测时相反的方向装到小测勾上(如图2),再将小测勾装到仪器的尾管和阿贝测体上; In the length measurement, sometimes encounter two arc distance L measurement problems, as shown in Figure 1. At this time you can use horizontal length measuring instrument to measure. Specific operations are as follows: 1. According to the measured radius of the arc R_1 and R_2 choose the appropriate radius of the spherical probe (instrument is measured in the diameter of the screw thread in the ball); To the small test hook (Figure 2), and then pin test to the tail pipe and Abbe test body;