利用数学方法，推导不对称公差标注与对称公差标注间的转换公式。
The transfer formula between asymmetric tolerance marking and symmetric tolerance marking is deduced by the mathematical method.
并进一步推导对称公差标注时尺寸链的计算公式，从而简化尺寸链计算。
The process dimension chain is calculated by the dimension chain calculating formula of symmetric tolerance marking.
并进一步推导对称公差标注时尺寸链的计算公式，从而简化尺寸链计算。
Further, the dimension chain calculating formula is deduced when symmetric tolerance marking is used, so that the dimension chain calculating is simplified.
扼要介绍有关对称结构尺寸公差值选择和计算以及在使用中应注意的问题。
Selection and calculation on tolerance value of symmetry construction were briefly introduced, some problems that should be paid attention to were also discussed.
并对键槽对称度公差及检测方法的确定作了进一步的探讨。
Whereas, it further discusses how to determine symmetry tolerances of the key slots and how to select methods for measuring and test.
并对键槽对称度公差及检测方法的确定作了进一步的探讨。
Whereas, it further discusses how to determine symmetry tolerances of the key slots and how to select methods for measuring and test.
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