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在机械传动零体中，如齿轮、蜗轮等一般都有键槽，以往都用手工在平板上用高度尺划线，不仅工效低，精度也不高。经过多年的模索和改进，利用废旧的游标卡尺制成内孔键槽专用划线工具，其结构如图１所示；它由左右活动爪、游标尺、定位圆柱和锁紧螺钉等组成。其工作原理如图２
In the mechanical transmission of the body, such as gears, worm gear and other generally have keyway, in the past by hand on the flat with a height ruler, not only low efficiency, accuracy is not high. After years of modeling and improvement, the use of scrap vernier calipers made of special marking tool for internal keyway, the structure shown in Figure 1; it consists of activities around the claw, vernier ruler, positioning cylinder and locking screws and other components. Its working principle shown in Figure 2