粗基准选择：有非加工表面，应选非加工表面作为粗基准。
Thick datum choice: Has the non-processing surface, the elected non-processing surface takes the thick datum.
基准选择以变速箱箱体的输入轴和输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。
The reference is chosen tobe the base of the input shaft and the output shaft of the gearbox, and the top and the two technological holes are used as the reference.
针对铸件机械加工时，铸件粗基准的确定和基准目标系统的建立进行了阐述，并得出了铸件粗基准的一些确定原则。
The determining of casting rough reference and establishing of reference target system are introduced from which the determining principle of casting rough reference is obtained.
针对铸件机械加工时，铸件粗基准的确定和基准目标系统的建立进行了阐述，并得出了铸件粗基准的一些确定原则。
The determining of casting rough reference and establishing of reference target system are introduced from which the determining principle of casting rough reference is obtained.
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