1、BRITISH STANDARD Technical drawings General principles of presentation Part 21 : Preparation of lines by CAD systems The European Standard EN IS0 128-21:2001 has the status ofa British Standard ICs 01.100.01; 35.240.10 BS EN IS0 128-21 12001 Incorporating Amendment No. I to (renumbers the BS IS0 as
2、BS IS0 I28-21:1997 BS ENISO I28-21:2001) Wk present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations
3、 represented on this committee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards
4、 Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard d
5、oes not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the IS0 title page, pages ii and iii, a blank page, pages 1 to 13 and a back cover. The BSI copyright date display
6、ed in this document indicates when the document was last issued. Amendments issued since publication O BSI 24 April 2002 ISBN O 580 36230 2 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license fro
7、m IHS-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 128-21 October 2001 ICs 01.100.01; 35.240.10 English version Technical drawings - General principles of presentation - Part 21 : Preparation of lines by CAD systems (IS0 128-21 :I 997) Dessins techniques - Principes gnraux de reprsenta
8、tion - Partie 21 : Prparation des traits par systmes de CAO (IS0 128-21:1997) Technische Zeichnungen - Allgemeine Grundlagen der Darstellung -Teil 21: Ausfhrung von Linien mit CAD- Systemen (IS0 128-21:1997) This European Standard was approved by CEN on 30 September 2001 CEN members are bound to com
9、ply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management
10、Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officia
11、l versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISC
12、HES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 128-21:2001 E Copyright European Committee for Standardization
13、Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-212001 I CORRECTED 2002-01-02 I Foreword The text of the International Standard from Technical Committee ISO/TC 1 O ”Technical drawings, product definition and related do
14、cumentation” of the International Organization for Standardization (ISO), the secretariat of which is held by CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2002, and conflicting natio
15、nal standards shall be withdrawn at the latest by April 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
16、Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. eciton tnemesrodnE Txet eht fo retnl ehtradnats IanoitanOSI d -821sah 7991:12 rppa neebyb devo sa NEC ruE anaepo radnatSw diyna tuoht mfidoica.noit NOTE Normative references to Inte
17、rnational Standards are listed in annex ZA (normative). Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-21:2001 I NT E R NAT I O N AL STANDARD IS0 1 28-2 1 First edition
18、 1997-03-01 Technical drawings - General principles of presentation - Part 21 : Preparation of lines by CAD systems Dessins techniques - Principes gnraux de reprsentation - Partie 21: Prparation des traits par systmes de CAO Reference number IS0 128-21 :I 997(E) Copyright European Committee for Stan
19、dardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-212001 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work
20、of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-government
21、al, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
22、 Publication as an International Standard requires approval by at least 75 ?AO of the member bodies casting a vote. International Standard IS0 128-21 was prepared by Technical Committee ISO/TC 1 O, Technical drawings, product definition and related documentation, Subcommittee SC 1, Basic conventions
23、. IS0 128 consists of the following parts, under the general title Technical drawings - General principles of presentation: - - - Part 20: Basic conventions for lines Part 27: Preparation of lines by CAD systems Part 23: Lines on construction drawings Further parts of IS0 128 are planned, covering o
24、ther general principles of presentation including those for the application of lines within drawings of various technical fields. Annex A of this part of IS0 128 is for information only. II Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reprod
25、uction or networking permitted without license from IHS-,-EN IS0 128-212001 Introduction Today the appearance of non-continuous lines on technical drawings prepared by computer-aided design (CAD) systems varies considerably between different systems. For that reason the standardized rules establishe
26、d by this International Standard, in addition to those in IS0 128-20, are intended as an aid for the consistent appearance of line elements calculated by computers and drawn by plotters. . 111 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo rep
27、roduction or networking permitted without license from IHS-,-Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-21:2001 Technical drawings - General principles of presentat
28、ion - Part 21 : Preparation of lines by CAD systems 1 Scope This part of IS0 128 specifies procedures for the calculation of the most important basic types of non-continuous lines according to IS0 128-20 and their line elements. 2 Normative references The following standards contain provisions which
29、, through reference in this text, constitute provisions of this part of IS0 128. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 128 are encouraged to investigate the possibility of applying the
30、 most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1 28-20: 1996, Technical drawings - General principles of presentation - Part 20: Basic conventions for lines. IS0 5455:1979, Technical drawings - Scales.
31、 3 Definitions For the purposes of this part of IS0 128 the definitions given in IS0 128-20 apply. 4 Calculation of line elements 4.1 Line type No. 02 (dashed line) See figure 1 for the configuration of this type of line. 1 Copyright European Committee for Standardization Provided by IHS under licen
32、se with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-21:2001 1- (1): Line segment Figure 1 EXAMPLE See figure 2. II Figure 2 Formulae: a) Length of the line: 11 = I!Q 1, - 12d b) Number of line segments within the line: n=- (rounded) 15d c) Length of
33、 the dashes: d) Minimum length of this line: 1, - 3dn n+l 12 =- 11min = lomi“ = 27d (2 dashes 12d, 1 gap 3d) If dashed lines with a length less than 11 = 27d, have to be drawn, a larger scale from IS0 5455 shall be used (.e. the elements are drawn at a larger scale). This line may be drawn with a co
34、nstant length of dashes (12d). In this case one end of the line may be a shorter or longer dash. EXAMPLE 11 = 125 125 - 4,2 n= = 23,01= 5.25 - d = 0,35 125 - 24,15 12 = = 4,202 24 2 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction o
35、r networking permitted without license from IHS-,-EN IS0 128-212001 Interpretation of the result: A dashed line, of length 125 mm and line width 0,35 mm, consists of 23 line segments of length 5,252 mm (4,202 mm + 1,050 mm) and one dash of length 4,202 mm 4.2 Line type No. 04 (long dashed dotted lin
36、e) See figure 3 for the configuration of this type of line. (1 1: Line segment EXAMPLE See figure 4. 12d - D f Figure 3 Figure 4 Formulae: a) Length of the line: b) Number of line segments within the line: c) d) Length of the long dashes: Minimum length of this line: A-A t f 11 = 10 + 24d (line exte
37、nded over the outlines at both sides) 11 - 24d n= (rounded) 30,5d 11 - 6,5dn n+l 1, = 3 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-212001 o , Lines shorter than 1,
38、= 54.5d shall be drawn as continuous narrow lines. In order to comply with the requirements of IS0 128-20:1996, clause 5, the length of the long dashes of this line may be decreased or increased. I 1 . . - . . - . . N x c II N 1 EXAMPLE 10 = 125 d = 0,25 131-6 n=- = 1 6,393 2 7,625 - 131 - 26,OO 1,
39、= =6,176 17 Interpretation of the result: A long dashed dotted line of length 131 mm and line width 0,25 mm, consists of 16 line segments of length 7,801 mm (6,176 mm + 0,750 mm + 0,125 mm + 0,750 mm) and 1 long dash of length 6,176 mm. 4.3 Line type No. 05 (long dashed double-dotted line) See figur
40、e 5 for the configuration of this type of line. I (1 1: Line segment -1 Figure 5 EXAMPLE See figure 6. 4 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-212001 Formulae:
41、 a) Length of the line: 11 = 10 - x 11 - 24d b) Number of line segments within the line: n= (rounded) 34d c) Length of the long dashes: 11 - 1Odn n+l 1, = d) Minimum length of this line: Ilmin = 58d Lines shorter than 11 = 58d shall be drawn at a larger scale, in accordance with IS0 5455. It is perm
42、issible to draw the long dashes with a change in direction, see figure 7. r- . Figure 7 In order to comply with the requirements of IS0 128-20:1996, clause 5, the length of the long dashes of this line may be increased or decreased. EXAMPLE lo = 128 d = 0,35 11 128-3=m X - = 1,5 2 n= 25 - 84 = 9,798
43、 11.9 - 4.4 Line type No. 07 (dotted line) See figure 8 for the configuration of this type of line. (1 1: Line segment Figure 8 5 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN
44、 IS0 128-212001 EXAMPLE See figure 9. Formulae: a) Length of the line: 1 Figure 9 b) Number of line segments within the line: c) Length of the dots: d) Minimum length of this line: /I = lo 11 - 0,5d n= (rounded) 3,5d 11 - 3dn l4 =- n+l EXAMPLE 11 = 125 d = 0,5 4.5 Line type No. 08 (long dashed short
45、 dashed line) The conditions for this line type are the same as those for type No. 04 but the formulae are slightly modified as fol lows. a) Length of the line: 11 = lo 11 - 24d b) Number of line segments within the line: n= (rounded) 32d c) Length of the long dashes: 1, - 12dn n+l 13 = Lengths of t
46、he short dashes: 6d (see table 3 of IS0 128-20:1996) d) Minimum length of this line: El min = 60d 6 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-EN IS0 128-212001 EXAMPLE 11 = 1
47、25 d = 0,5 125-12 n= = 7,063 2 2 16 - 4.6 Line type No. O9 (long dashed double-short dashed line) The conditions for this line type are similar to those for type No. 05 and the formulae b), c) and d) are slightly modified as follows: a) Length of the line: 11 = lo 11 - 24d b) Number of line segments
48、 within the line: n= (rounded) 45d c) Length of the long dashes: Length of the short dashes: Minimum length of this line: d) 11 - 21dn n+l 13 = 6d (see table 3 of IS0 128-20:1996) limin = 69d EXAMPLE 11 = 125 d = 0.25 a=- 125-6 =10,578 2- 11.25 - 125 - 57,75 12 l3 = = 5,604 4.7 Examples of combinations of basic types of line 4.7.1 Two types of lines superimposed See figure 1 O for the configuration of this type of line. a) b) (1) c (1 1: Line segment a): Continuous line No. O1 : line width, e.g. 0,25 mm b): Dashed spaced line No. 03: line width, e.g. 0.5 m
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