The maximum sizes in the directions of length, width and height which may be inferred by the other dimensions.
总体尺寸、定位尺寸、定形尺寸可能 重合,这时需作调整,以免出现多余尺寸。
Adjustment should be made if the three types of dimensions may be coincide to avoid redundant dimensions.
通常以零件的底面、端面、对称面 和轴线作为基准。Datums can be the base, a main side
face, symmetry plane ,or center line.
⑶ ( 总体尺寸) (Overall dimensions) 零件长、宽、高三个方向的最大尺寸。 (不一定需要直接标注)
basic components with each other.
要标注定位尺寸,必须先选定尺寸基准。零件有长、 宽、高三个方向的尺寸,每个方向至少要有一个基准。
Location dimensions must be measured from properly selected datums. At least one datum should be determined along each directions of the part : along length ,along width and along height directions.
清晰Clear:
redundant
尺寸布置要整齐、清晰,便于阅读。
Dimensions layout should be clear and convenient for reading