Fundamentals of Engineering Drawing工程制图基础 全套课件（英文版）（上）.pptx

工程制图基础 工程制图基础出版社 国际合作部 Chapter 1 Basic Skills of Engineering DrawingA new machine，or product must exist in the mind of the engineer or designer before it becomes a reality. This original concept or idea is usually placed on paper called drawing paper to form engineering drawing. The engineers or designers can communicate each other with the engineering drawing. 1.1 Drawing Instrument1.1.1 Drawing pencils A good drawing begins with a proper drawing pencil and its correct use. Pencil grade ranges from the hardest, 9H, to the softest, 7B. Grade H, HB and B are most frequently used because of their medium hardness. The choice of the proper drawing pencils depends on personal preference and the drawing paper used. Fig.1.1 Sharpen drawing pencils correctly.1.1.2 Pencil eraser Fig.1.2 Erasing shield.1.1.3 Erasing shield擦图片1.1.4 Triangles三角板 Fig.1.3 Triangle. Fig.1.4 Parallel line construction Fig.1.5 Perpendicular line Construction.1.1.5 Compass圆规 Fig.1.6 Compass.1.1.6 Divider分规 Fig.1.7 Divider. Fig.1.8 Using divider.1.1.7 Drawing board 图板 Fig.1.9 Drawing board.1.1.8 Tsquare 丁字尺 Fig.1.10 T-square. Fig.1.11 Drawing a horizontal line. Fig.1.12 Drawing a vertical line.1.2 (Provisions of Chinese National Standard of Technical Drawing (机械制图国家标准的规定)1.2.1 Drawing paper (GB/T 14689—1993)1.2.1.1 Drawing paper size (图幅) The sizes of the drawing papers together with their lengths, widths and letter designations, are listed in Chart 1.1.  Chart 1.1 Paper size 1.2.1.2 Paper frame format (图框格式) Fig.1.13 Format of paper frame.1.2.2 Title block (标题栏) Fig.1.14 Papers located vertically. Fig.1.15 Title block1.2.3 Measurement units for engineering (工程计量单位)1.2.3.1 Metric system (SI) of units Fig.1.16 The centimeter. 1.2.3.2 English system of units Fig.1.17 English units.1.2.4 Scales (比例) (GB/T 14690—1993) Chart 1.2 Scales1.2.5 Characters (字体) (GB/T 14691—1993)1.2.5.1 Height and number of a character (字高和字号)1.2.5.2 Chinese characters (汉字) Fig.1.18Chinese characters in font of “长仿