ISO-128-20-1996.pdf
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1、INTERNATIONAL STANDARD IS0 128-20 First edition 1996-l l-l 5 Technical drawings - General principles of presentation - Part 20: Basic conventions for lines Dessins techniques - Principes g figure 2 b): a continuous and a dashed spaced line. a) b) Figure 2 b) Arranged next to each other. See figure3
2、for an example (two continuous lines either side of two dashed spaced lines). Figure 3 3.3.3 Arrangement of two continuous lines parallel to each other with regularly recurring connecting elements between them See figure4a) and b) for examples figure 4a): blackened circular elements; figure 4b): bla
3、ckened trapezoidal elements. b) Figure 4 0 IS0 IS0 128-20:1996(E) 3.3.4 Arrangement of regularly recurring geometric pictorial elements in association with continuous lines a) Without interruption of a continuous line. See figure 5 for examples. I I I I I I I L L L L L L A A A A A A A I I I I I I I
4、Figure 5 b) With interruption of a continuous line. See figure 6 for examples. Figure 6 4 Line dimensions 4.1 Line width The width, d, of all types of lines shall be one of the following depending on the type and size of the drawing. This series is based on a common ratio 1: J- 2 (z 1:1,4): 0,13 mm;
5、 0,18 mm; 0,25 mm; 0,35 mm; 0,5 mm; 0,7 mm; 1 mm; 1,4 mm; 2 mm The widths of extra wide, wide and narrow lines are in the ratio 4:2:1. The line width of any one line shall be constant throughout the whole line. 4.2 Deviation in line width Line widths may deviate from those specified in 4.1 providing
6、 that it is possible to differentiate unambiguously between two adjacent lines with different widths. If drawing equipment which produces constant line width is used, the deviation in line width between two such lines shall not be greater than + 0,ld. 5 -,-,- IS0 128-20:1996(E) 4.3 Configuration of
7、lines For the preparation of drawings by hand the lengths of line elements should conform to those of table3. Table 3 Line element Line type No. Length Dots 04 to 07 0,5d and 10to15 Gaps 02 and 04 to 15 3d Short dashes Dashes 08 and 09 02, 03 and 10 to 15 6d 12d Long dashes 04 to 06, 08 and 09 24d S
8、paces 03 18d NOTE - The lengths shown in this table are valid for line elements with semi- circular and squared ends. In the case of line elements with semicircular ends, the length of the line element corresponds to the distance covered by a technical pen (with a tubular tip and using India ink) fr
9、om the origin up to the end of the line element. The total length of such a line element is the sum of the length shown in table3 plus d. Formulae for the calculation of some of the basic types of line and line elements are given in IS0 128-21. The formulae are intended to facilitate the preparation
10、 of drawings using computer-aided design (CAD) systems. 5 Draughting of lines 5.1 Spacing The minimum space between parallel lines should not be less than 0,7 mm, unless rules to the contrary are stated in other International Standards. NOTE 4 In certain cases when computer-aided drawing techniques
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