尺寸公差标注是绘制机械图的一项重要内容。
It is essential to mark common difference measurement in a machine drawing.
还有在二维图公差标注步骤繁多，标注不便等等不方便的地方。
Moreover, the inconvenience are represented in the two-dimensional graph, such as the steps of tolerance marking are various and complicated.
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.
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