若要求奇数孔的中心所围成的圆直径D。则可在相邻的两孔中插入两个圆柱销(销与孔的配合应相当于过渡配合),先测出圆柱销的直径d与外侧尺寸L,然后用(L-d)值乘以附表中相应孔数的K值,即可求得具有该孔数的心圆直径D值(附表中的K值是由图示中按不同孔数精确计算得来的)。用公式表示:D=(L-d)K K=1/sin(180°/Z) [例]:三孔直径d=20,测得L=123.92见附图按孔数查表K=1.1547则D=(L-d)K=120mm. If you want the center of the odd hole surrounded by the diameter D of the circle. You can insert the two adjacent holes in the two cylindrical pin (pin and hole should be equivalent to the transition with the match), first measure the diameter of the cylindrical pin d and outside the size of L, and then (Ld) multiplied by the value of the Schedule In the corresponding hole number K value, you can get the diameter of the circle with the number of holes D value (in the table in the K value is calculated by the number of holes in the figure accurately calculated). Formula: D = (Ld) KK = 1 / sin (180 ° / Z) [Example]: three holes diameter d = 20, measured L = 123.92 See the figure by hole table K = 1.1547 then D = (Ld) K = 120 mm.