如果在游标卡尺的量爪上装上如图1,2所示的脚座3,以螺钉2固紧,可扩大卡尺测量项目。为避免偏摆,用压板5、螺钉6加以约束。使用时,根据所测工件情况,装上测杆4或再装上燕尾块。按图3a和3c使用时,尺寸A由卡尺读数加上(B+C)取得;按图3b和3d使用时,尺寸A由卡尺读数减去(B+C)取得。(B+C)的值应在使用前测量出来。这组附件制作不难,使用方便,但测量精度略比卡尺原有精度低一些,可用于精度不太高的零件测量。 If the vernier caliper claw mounted on the feet as shown in Figure 1,2 3, with 2 screws to expand, caliper measurement items can be expanded. To avoid yawing, use plate 5, screw 6 to be constrained. Use, according to the measured workpiece situation, install the rod 4 or install the dovetail block. When used according to Figures 3a and 3c, dimension A is obtained from the caliper reading plus (B + C); when used in Figures 3b and 3d, dimension A is obtained by subtracting (B + C) from the caliper reading. The value of (B + C) should be measured before use. This set of accessories is not difficult to create, easy to use, but the measurement accuracy slightly lower than the original caliper, can be used for less accurate part measurements.