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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 3457 (2009): RADII FOR ROUNDING FOR GENERAL ENGINEERING PURPOSES [PGD 20: Engineering Standards] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 3457 : 2009 Hkkjrh; ekud lkekU; bta hfu;fjxa ç;kts uk as grs q i.w kkd± u oQs fy, f=kT;k,¡ (nlw jk iuq jh{k.k) Indian Standard RADII FOR ROUNDING FOR GENERAL ENGINEERING PURPOSES ( Second Revision ) ICS 17.020 © BIS 2009 B U R E A U O F I N D I A N S T A N D A R D S MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 May 2011 Price Group 2 Engineering Standards Sectional Committee, PGD 20 FOREWORD This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Engineering Standards Sectional Committee had been approved by Production and General Engineering Division Council. This standard was first published in 1966 and revised in 1987. In this second revision, the objective of this standard is to limit the number of tools, gauges and measuring instruments needed for the manufacture and checking of radii. Therefore, only the radii specified in this standard should be used in the design of work pieces. In this standard editorial revision has been made and the examples have been brought into line with current practice. In the formulation of this standard, considerable assistance has been derived from DIN 250 - 2002 ‘Radii on work pieces and their representation in technical drawings’. Annex A of this standard is for information only. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding of numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS 3457 : 2009 Indian Standard RADII FOR ROUNDING FOR GENERAL ENGINEERING PURPOSES ( Second Revision ) 1 SCOPE Table 1 Sizes of Radii (Clause 3) This standard specifies radii on workpieces and All dimensions in millimetres. gives examples of their representation in technical drawings. The radii conform to the preferred number r series R5, R10 and R20 as in IS 1076 (Part 3) : 1985 ‘Preferred numbers: Part 3 Guide to the choice of Series 1 Series 2 series of preferred number and of series containing 0.2 0.3 more rounded values of preferred numbers (second 0.4 0.5 revision)’ with some of the values taken from the 0.6 0.8 corresponding rounded values R"5, R'10 and R"10. 1 1.2 2 REFERENCE 1.6 2 2.5 3 The following standard contains provisions which 4 5 through reference in this text, constitute provision of this standard. At the time of publication, the edition 6 8 indicated was valid. All standards are subject to 10 12 revision and parties to agreements based on this 16 18 standard is encouraged to investigate the possibility 20 22 of applying the most recent edition of the standard 25 28 indicated below: 32 36 IS No. Title 40 45 50 56 IS/ISO 13715 : Technical drawings — Corners — 63 70 1994 Vocabulary and indication on drawings 80 90 100 110 3 DIMENSIONS OF RADII 125 140 Sizes of radii on work pieces shall be as given in 160 180 Table1. Series 1 sizes to be given preference. 200 1 IS 3457 : 2009 ANNEX A (Foreword) DIMENSIONS OF RADII ON DRAWINGS A-1 EXAMPLES NOTE—Symbol r indicates a radius as a design feature and should not be confused with symbol R ( see IS/ISO 13715) which is used for dimensioning radii on drawings is given in Fig. 1 to 5. FIG. 1 RADII ON ENDS AND UNDERCUTS FIG. 2 RADII ON HOLES AND COUNTERBORES FIG. 3 RAD II ON AN OPENING (EYE) 2 IS 3457 : 2009 FIG. 4 RADII ON FLAT PLATES FIG. 5 RADII ON CASTINGS, FORGINGS AND MOULDED PARTS 3 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’. This Indian Standard has been developed from Doc No. : PGD 20(1021). 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