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 14872-2 (2000): Ball Screws, Part 2: Nominal Diameters and Nominal Leads - Metric Series [PGD 2: Machine Tool Elements and Holding Devices] “!ा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 14872 (Part 2) :2000 ISO 3408-2 : 1991 Indian Standard —. BALL SCREWS PART 2 NOMINAL DIAMETERS AND NOMINAL LEADS — METRIC SERIES ICS 25.060.99 0 BIS 2000 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 September 2000 Price Group 1 Machine Tool Elements and Holding Devices Sectional Committee, BP 02 NATIONAL FOREWORD This Indian Standard (Part 2) which is identical with ISO 3408-2:1991 ‘Bail screws — part 2: Nominal 1. diameters and nominal leads — Metric series’ issued by the International Organization for Standardiza- tion (ISO), was adopted by the Bureau of Indian Standards on the recommendation of the Machine Tool Elements and Holding Devices Sectional Committee and approval of the Basic and Production Engi- .. neering Division Council. This standard deals with ball screws used on machine tools and is being issued in the following parts: Ball Screws— Part 1 Vocabulary and designation Part 2 Nominal diameters and nominal leads — Metric series Part 3 Acceptance conditions and acceptance tests Part 4 Ball screw axial rigidity Part 5 Distribution of static and dynamic loads and operational life At the moment only standards on Parts 1, 2 and 3 are being issued whereas standards in regard to Parts 4 and 5 will be issued as soon as the work on them is completed at the International level. The text of the ISO Standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’: b) Comma (,) has been used as a decimal marker while in Indian Standards the current practice is to use a point (.) as the decimal marker. In the adopted standard, reference appears to one International Standard for which Indian Standard also exists. The corresponding Indian Standard which isto be substituted in its place is listed along with its degree of equivalence for th e edition indicated. International Standard Corresponding Indian Standard Degree of Equivalence ISO 3408-1 :1991 Ball screws IS 14872 (Part 1) :2000 Ball screws: Identical — Part 1: Vocabulary and Part 1Vocabulary and designation designation (f3i/ingua/ edition) For the purpose of deciding whether a particular requirement of this standard iscomplied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accor- dance with IS2:1960 ‘Rules for rounding off 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 14872 (Part 2):2000 ISO 3408-2:1991 Indian Standard BALL SCREWS PART 2 NOMINAL DIAMETERS AND NOMINAL LEADS — METRIC SERIES . 1 scope 6–8–10–12–16–20–25–32 –40-50– 63-80 -100 -125 -160and 200. This part of ISO 3408 specifies the nominal diameters and nominal leads, metric series, for ball screws. It also gives preferred combinations of nominal diameter and nominal lead 5 Nominal leads and a general plan which includes additional combinations to be used when it becomes necessary to deviate from the pre- ferred combinations. The following series of nominal leads, in millimetres, shall be used: 2 Normative reference 1–2–2,5–3–4–5–6– 8–10–12–?6– 20 – 25 – 32 and 40. The following standard contains provisions which, through Where possible, preference shall be given to the following reference in this text, constitute provisions of this part of nominal leads, in millimetres: ISO 3408. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to 2,5–5–10–20and 40. agreements based on this part of ISO 3408 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO main- tain registers of currently valid International Standards. 6 Combinations of nominal diameters and ISO 3408-1 : 1991, Ball screws – Part 1: Vocabulary and nominal leads designation. 6.1 Preferred combinations 3 Definitions See table 1. For the purposes of this part of ISO 3408, the definitions given 6.2 General plan in ISO 3408-1 apply. Seetable 2. 4 Nominal diameters For preferred combinations, use the nominal lead values which are underlined. When itbecomes necessary to deviate from the The following series of nominal diameters, in millimetres, shall preferred combinations, use the nominal lead values which are be used: not underlined. IS 14872 (Part2) :2000 ISO 3408-2:1991 Table 1 Dimensions inmillimetres Nominal I Nominal Iced diameter 6 2,5 8 2,5 10 2,5 5 12 2,5 5 10 16 2,5 5 10 20 5 10 20 -.. 25 5 10 20 32 5 10 20 40 5 10 20 50 5 10 20 63 5 10 20 60 10 20 10U 10 20 125 10 20 160 20 200 20 Table 2 Dimensions inmillimetres Nominal Nominal Iced diameter 6 1 2 2,5 — 8 1 2 G 3 10 1 2 GL 3 4 ~ 6 12 2 2,5 3 4 5 6 8 ~ 12 16 2 ILii 3 4 ~_ 6 8 ~ 12 16 20 3 4 g 6 8 ~ 12 16 g 25 4 —5 6 8 10 12 16 g 25 32 4 5 6 8 G 12 16 20 25 32 40 i— 6 8 h_ 12 16 i—ii 25 32 ~ 50 5 6 8 ~ 12 16 20 25 32 40 63 ;— 6 8 10 12 16 G 25 32 & 60 6 8 h_ 12 16 _G 25 32 g lcm y 12 16 20 25 32 Q 125 —1.0 12 16 & 25 32 40 160 12 16 ii 25 32 ~ 200 12 16 z—) 25 32 ~ 2 Bureau of Indian Standards BIS is a statutory institution established under the Bureau 01 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. 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