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i)极大极小法因角度公差一般用双向对称偏差表示,故进行极值计算时用各环公差值之半代入。由已知封闭环与组成环的函数关系式为: tg~2α=ctg~2φ-tg~2γ则按计算关系式(2)得
i) Very small method The angle tolerance is generally expressed by two-way symmetric deviation, so when calculating the extreme value, use the half tolerance value of each ring to substitute. From the known closed ring and the composition of the ring function as follows: tg ~ 2α = ctg ~ 2φ-tg ~ 2γ according to the calculation of the relationship (2) was