1、CEN EN*ISO*5455 94 3404589 OL0974b 624 = BRITISH STANDARD Technical drawings - Scales The European Standard EN IS0 5455 : 1994 has the status of a British Standard BS EN IS0 5455 : 1995 BS 308 : Section 1.4 : 1995 CEN EN*IS0*5455 94 3404589 0309747 550 BS EN IS0 5456 : 1995 Amd. No. Date O BSI 1995
2、Committees responsible for this British Standard Text affected The preparation of this British Standard was entrusted to Technical Committee TDW4, Engineering drawing practice, upon which the following bodies were represented: Atomic Weapons Establishment British Gas plc British Standards Society Dr
3、awing Office Material Manufacturers and Dealers Association Electricity Association Gauge and Tool Makers Association HEVAC Association institution of Chemical Engineers institution of Engineering Designers Power Generation Contractors Association Society of British Aerospace Companies Ltd. Universi
4、ty of Warwick The following BSI references relate to the work on this standard: Committee reference TDW4 Draft announced in BSI News August 1995 ISBN O 580 23771 O CEN EN*IS0*5455 94 3404589 0109748 497 BS EN IS0 5455 : 1995 Contents Committees responsible National foreword Page Inside front cover i
5、i Foreword Text of EN IS0 5455 2 3 i CEN EN*IS0*5455 94 m 3404589 O309749 323 m BS EN Is0 5455 : 1995 National foreword This British Standard has been prepared by Technical Committee TDW4 and is the English ianguage version of EN IS0 5455 : 1994 Techna dmwings - Scales, published by the European Com
6、mittee for Standardization (CEN). It is identical with IS0 5455 : 1979, published by the Intemational Organization for Standardization (ISO). This British Standard partially supersedes BS 308 : Part 1. It is envisaged that when the fdi range of European Standards on technical drawing is implemented
7、BS 308 will be withdrawn. Compliance with a British Standard does not of itself confer immunity from legai obligations. CEN EN*ISO*5455 EUROPEaN LJTANDARD NORME EUROPENNE EuROPmE NOM 94 3404589 0309750 045 EN IS0 5455 October 1994 ICs 01.100.10 Descriptors: Scale (ratio), designation, engineering dr
8、awings English version Technical drawings - Scales (IS0 5455 : 1979) Dessins techniques - Echeles (IS0 5455 : 1979) Technische Zeichnungen - M En object as represented in the original drawing to the real linear dimension of the same element of the object itsel f. POTE - The scale of a print may be d
9、ifferent from that of the c. igiiial drawing. 2 2 full size : A scale with the ratio 1 : 1. 28 enlargement scale : A scale where the ratio is larger ttw! 1 : 1. It is said to be larger as its ratio increases. 2.4 reduction scale : A scale where the ratio is smaller than 1 : 1. It is said to be small
10、er as its ratio decreases. 3 DESIGNATION The complete designation of a scale shall consist of the word “SCALE“ (or its equivalent in the language used on the drawing) followed by the indication of its ratio, as follows : - SCALE 1 : 1 for full size; - SCALE X : 1 for enlargement scales; - SCALE 1 :
11、X for reduction scales. If there is no likelihood of misunderstanding, the word “SCALE“ may be omitted. 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
12、 scale only shall be inscribed in the title block, and all other scales adjacent to the item reference number of the part concerned, or adjacent to the reference letter of a detail view (or section). 5 SCALES 5.1 The recommended scales for use on technical drawings are specified in the following tab
13、le. NOTE - If, for special applications, there is need for a larger en- largement scale or a smaller reduction 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 recom- mended scale by multiplyi
14、ng by whole number powers of 10. In exceptional cases where for functional reasons the recommended scales cannot 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.
15、 In all cases, the selected scale shall be large enough to permit easy and clear interpretation of the information 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 b
16、e shown adjacent to the main representation in a separate detail view (or section) which is drawn )o a larger scale. 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 s
17、implified by showing the outlines of the object only. CEN EN*ISO*5455 94 m 3404589 0109753 854 m BS EN IS0 5455 : 1995 BS 308 Section 1.4 : 1995 BSI 389 Chiswick High Road London w4 4AL 95 10-3-0.35k-FP BSI - British Standards Institution BSI is the independent national body responsible for preparin
18、g British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
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24、 0181 996 7002; Fax: 0181 996 7001. Copyright Copyright subsists in all BSI publications and no part may be reproduced in any form without the prior permission in writing of BSI. This does not preclude the free use, in the course of implementing the standard of necessary details such as symbols and
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