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测量偶数螺栓孔均布圆周的直径,是在相对的两个孔中各插一个销子(滑配合),测量其外侧尺寸,再减去一个销子直径即得。求奇数均布孔圆周的直径,仍然可以在相邻的两个孔中插两个销子,测量其外侧尺寸并减去一个销子直径,然后把所得值乘以附表中相应的常数即可(附表是由附图按不同孔数计算得来)。例:若图示之A=3.464英寸,则乘以表中3个孔对应之常数1.1547即得D=3.464×1.1547=
Measure even the diameter of even bolt holes in the circumference of the circle, in the opposite two holes, each insert a pin (slip fit), measuring its outer dimensions, minus one pin diameter that is. To find the diameter of an even number of even holes, you can still insert two pins in two adjacent holes, measure the outside dimensions and subtract the diameter of a pin, and multiply the result by the corresponding constant in the table (Schedule is calculated by the number of different holes from the drawings). Example: If A = 3.464 inches, multiply the constant of 1.1547 corresponding to the three holes in the table, that is, D = 3.464 × 1.1547 =