如图1所示测量装置是用于装在游标卡尺上测圆弧用的附件,可对凸圆弧直接读数测量。 结构原理如图1所示,螺钉2将附件固定在卡尺测深尺端面。被测件4置于V槽中,测杆3测出V槽顶点与R距离。当V槽为60°时,其距离等于圆弧半径尺寸。用标准圆柱校对比较测量,能提高其测量精度。 The measuring device shown in Fig. 1 is an attachment for measuring arcs on a vernier caliper and can measure directly on convex arcs. The structural principle is shown in Fig. 1, the screw 2 fixes the attachment to the caliper depth scale end face. DUT 4 is placed in the V-groove, measuring rod 3 measured V-groove vertex and R distance. When the V-groove is 60 °, the distance equals the radius of the arc. Comparison with the standard cylindrical proofreading measurement, can improve its measurement accuracy.