生产中经常会遇到图1所示的工件。此类零件内孔或外圆处开有槽或滚道,其直径d如采用通用工具测量,测量误差较大。图2所示是我们用游标卡尺改制的专用工具,测量前根据工件直径,用千分尺或专用对表块校正千分表,仪指针对零位。测量时,沿圆周方向及轴向摆动检具,通过千分表的读数, Production often encounter the workpiece shown in Figure 1. Grooves or grooves on the inner hole or the outer part of such parts, the diameter d, such as the use of general-purpose tools to measure the measurement error. Figure 2 shows that we use vernier caliper special tools, measuring the diameter of the workpiece before the measurement, with a micrometer or a dedicated dial gauge correction table, the instrument for zero. Measurement, along the circumferential direction and axial swing gage, through the dial gauge readings,