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图1所示零件有二条“O”型圈槽,槽径为φ159.6h9(_(-0.1)~0),槽宽为6.4(_0~(+0.2))。由于尺寸较大,槽又窄,用游标卡尺和普通千分尺无法测量。因为150～175mm外径千分尺测杆和测砧的直径为6.5mm,并且固定测砧的端面与尺架的距离短(<5mm)。测量时,如果用两根φ6mm的圆柱垫入测杆和测砧与零件中间,所获得的读数再减去两根圆柱的尺寸,才可得到零件的槽径尺寸。此种方法,测量与计算都比较麻烦。
The part shown in Figure 1 has two “O” ring grooves with a diameter of φ159.6h9 (_ (- 0.1) ~ 0) and a groove width of 6.4 (_0 ~ (+0.2)). Due to the larger size, the trough is narrow and can not be measured with vernier caliper and ordinary micrometer. Because 150 ~ 175mm diameter micrometer rod and test anvil diameter of 6.5mm, and the fixed anvil face and the distance between the short (<5mm). When measuring, if you use two φ6mm cylindrical pad into the middle of the measuring rod and measuring anvil and parts, obtained readings minus the size of the two cylindrical, can get the size of the groove size. This method, measurement and calculation are more troublesome.