在机械加工过程中,对于加工件的内槽尺寸(图1),加工者只能靠小刀架控制尺寸,这样尺寸不易保证,检验员测量更加困难。在实际检测中,我们通过多次实践,制作出了一种可以伸缩大小的内卡钳,即“弹簧内槽卡钳”解决了测量内槽直径的困难,其使用方便,制作简易,测量精确实用。制作原理及组成:弹簧内槽卡钳主要靠一个弹簧钢卡圈起到伸缩大小作用而制作(图2),主要结构为,1.手把;2.弹簧卡圈;3.卡 In the machining process, the size of the inner groove of the workpiece (Figure 1), the processor can only rely on the size of the holder to control the size so that the size is not easy to ensure that the inspector to measure more difficult. In actual testing, we made a kind of retractable inner caliper through practice, that is, the spring inner caliper solved the difficulty of measuring the diameter of the inner tub. The utility model has the advantages of convenient use, simple manufacture and accurate and practical measurement. Production principle and composition: spring inner slot caliper mainly by a spring steel ring play the role of telescopic size (Figure 2), the main structure, 1. Handle; 2. Spring clip; 3. Card