所采用的制造工艺和使利润最大化的最小生产及装配成本都要求给定公差以保持所需允差。
Both must be given tolerances in keeping with the allowance desired, the manufacturing processes available, and the minimum cost of production and assembly that will maximize profit.
为了使配合零件之间具有过盈或强制配合，公差必须产生零或负允差。
To have an interference or force fit between mating parts, the tolerances must be such as to create a zero or negative allowance.
允差，有时会跟公差混淆，但其具有完全不同的含义。
Allowance, which is sometimes confused with tolerance, has an altogether different meaning.
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