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机械工程CAD制图规则
1.范围.....................................................................................................................2
2.引用标准.............................................................................................................2
3.基本原则.............................................................................................................2
4.图线.....................................................................................................................2
4.1图线组别.........................................................................................................2
4.2图线的结构.....................................................................................................3
4.2.1双折线...........................................................................................3
4.2.1.1双折线的尺寸...........................................................................................3
4.2.1.2计算双折线各部分尺寸的公式...............................................................3
4.2.1.3举例...........................................................................................................3
4.2.2虚线（F型线）............................................................................3
4.2.2.1虚线的尺寸...............................................................................................3
4.2.2.2计算虚线各部分尺寸的公式...................................................................4
4.2.2.3举例...........................................................................................................4
4.2.3点画线（G型线、J型线）..........................................................4
4.2.3.1点画线的尺寸...........................................................................................4
4.2.3.2计算点画线各部分尺寸的公式...............................................................4
4.2.3.3举例...........................................................................................................5
4.2.4双点画线（K型线）....................................................................5
4.2.4.1双点画线的尺寸.......................................................................................5
4.2.4.2计算双点画线各部分尺寸的公式...........................................................5
4.2.4.3举例...........................................................................................................5
4.3重合图线的优先顺序.....................................................................................6
4.4非连续线的画法.............................................................................................6
4.4.1相交线...........................................................................................6
4.4.2接触与连接线和转弯线的画法...................................................6
4.5图线颜色.........................................................................................................6
5.字体.....................................................................................................................7
5.1数字.................................................................................................................7
5.2小数点.............................................................................................................7
5.3字母.................................................................................................................7
5.4汉字.................................................................................................................7
5.5标点符号.........................................................................................................7
5.6图纸幅面.........................................................................................................7
5.7字（词）距、行距.........................................................................................7
6.尺寸线的终端形式.............................................................................................8
7.图形符号的表示.................................................................................................8
8.图样中各种线型在计算机中的分层.................................................................8