1、BRITISH STANDARD BS EN ISO 5455:1995 BS308-1.4: 1995 Technical drawings Scales The European Standard EN ISO5455:1994 has the status of a British StandardBSENISO5455:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority
2、 of the Standards Board and comes intoeffect on 15October1995 BSI01-1999 The following BSI references relate to the work on this standard: Committee reference TDE/4 Draft announced in BSI News August1995 ISBN0580237710 Committees responsible for this British Standard The preparation of this British
3、Standard was entrusted to Technical Committee TDE/4, Engineering drawing practice, upon which the following bodies were represented: Atomic Weapons Establishment British Gas plc British Standards Society Drawing Office Material Manufacturers and Dealers Association Electricity Association Gauge and
4、Tool Makers Association HEVAC Association Institution of Chemical Engineers Institution of Engineering Designers Power Generation Contractors Association Society of British Aerospace Companies Ltd. University of Warwick Amendments issued since publication Amd. No. Date CommentsBSENISO5455:1995 BSI 0
5、1-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO 5455 3BSENISO5455:1995 ii BSI 01-1999 National foreword This British Standard has been prepared by Technical Committee TDE/4 and is the English language version of ENISO5455:1994 Technical
6、 drawings Scales, published by the European Committee for Standardization (CEN). It is identical with ISO5455:1979, published by the International Organization for Standardization (ISO). This British Standard partially supersedes BS308-1. It is envisaged that when the full range of European Standard
7、s on technical drawing is implemented BS308 will be withdrawn. 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 does not of itself confer immunity fr
8、om legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 and 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amend
9、ment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO5455 October1994 ICS01.100.10 Descriptors: Scale (ratio), designation, engineering drawings English version Technical drawings Scales (ISO5455:1979) Dessins techniques Echelles (ISO5455:1979) Technische Zeich
10、nungen Mastbe (ISO5455:1979) This European Standard was approved by CEN on1994-10-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
11、and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 responsi
12、bility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, P
13、ortugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN ISO5455:1994 EENISO5455:1994 BS
14、I 01-1999 2 Foreword This European Standard was taken over by CEN from the work of ISO/TC10, Technical drawings, product definition and related documentation, of the International Standards Organization (ISO). The Technical Board had decided to submit the final draft for Formal Vote. The result was
15、positive. 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 April1995, and conflicting national standards shall be withdrawn at the latest by April1995. According to the CEN/CENELEC Internal Regulat
16、ions, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword 2 1 Scope and field of appl
17、ication 3 2 Definitions 3 3 Designation 3 4 Inscription 3 5 Scales 3 6 Large scale drawings 3ENISO5455:1994 BSI 01-1999 3 1 Scope and field of application This International Standard specifies recommended scales and their designation for use on all technical drawings in any field of engineering. 2 D
18、efinitions 2.1 scale ratio of the linear dimension of an element of an object as represented in the original drawing to the real linear dimension of the same element of the object itself NOTEThe scale of a print may be different from that of the original drawing. 2.2 full size a scale with the ratio
19、1 : 1 2.3 enlargement scale a scale where the ratio is larger then1 : 1. It is said to be larger as its ratio increases 2.4 reduction scale a scale where the ratio is smaller than1 : 1. It is said to be smaller as its ratio decreases 3 Designation The complete designation of a scale shall consist of
20、 the word “SCALE” (or its equivalent in the language used on the drawing) followed by the indication of its ratio, as follows: SCALE1 : 1 for full size; SCALE X : 1 for enlargement scales; SCALE1 : X for reduction scales. If there is no likelihood of misunderstanding, the word “SCALE” may be omitted
21、. 4 Inscription 4.1 The designation of the scale used on the drawing shall be inscribed in the title block of the drawing. 4.2 Where it is necessary to use more than one scale on a drawing, the main scale only shall be inscribed in the title block, and all other scales adjacent to the item reference
22、 number of the part concerned, or adjacent to the reference letter of a detail view (orsection). 5 Scales 5.1 The recommended scales for use on technical drawings are specified in the following table. NOTEIf, for special applications, there is need for a larger enlargement scale or a smaller reducti
23、on scale than those shown in the table, the recommended range of scales may be extended in either direction, provided that the required scale be derived from a recommended scale by multiplying by whole number powers of10. In exceptional cases where for functional reasons the recommended scales canno
24、t be applied, intermediate scales may be chosen. 5.2 The scale to be chosen for a drawing will depend upon the complexity of the object to be depicted and the purpose of the representation. In all cases, the selected scale shall be large enough to permit easy and clear interpretation of the informat
25、ion depicted. The scale and the size of the object, in turn, will decide the size of the drawing. 5.3 Details that are too small for complete dimensioning in the main representation shall be shown adjacent to the main representation in a separate detail view (or section) which is drawn to a larger s
26、cale. 6 Large scale drawings It is recommended that, for information, a full size view be added to the large scale representation of a small object. In this case the full size view may be simplified by showing the outlines of the object only. Category Recommended scales Enlargement 50 : 1 20 : 1 10
27、: 1 scales 5 : 1 2 : 1 Full size 1 : 1 1 : 2 1 : 5 1 : 10 Reduction 1 : 20 1 : 50 1 : 100 scales 1 : 200 1 : 500 1 : 1000 1 : 2000 1 : 5000 1 : 10000BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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