介绍了零件在加工过程中出现误差之后，如何用公差原则来判断其合格性，并通过实例给出了公差原则的公式化表述方法。
This Paper describes that how to use tolerance principle to identify the qualified problem of spares after the spares show error in the process through examples.
基于机械加工误差的特点，利用灰色系统理论建立轴承磨削加工过程尺寸误差动态分析的数学模型。
The mathematical model is established for the dynamic distributions of dimension errors in bearing grinding process by means of the Grey theory.
要将机械加工误差降至最低，需要极为精细的加工过程。
Machining tolerances are minimal and handling is a truly delicate task.
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