Disclosure to Promote the Right To Information

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1 इ टरन ट म नक 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. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (2004): Double-pitch precision roller chains and sprockets for transmission and conveyors [PGD 31: Bolts, Nuts and Fasteners Accessories]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen




5 Transmission Devices Sectional Committee, MGP 30 NATIONAL FOREWORD This Indian Standard which is identical with Double-pitch precision roller chains and sprockets for transmission and conveyors issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Transmission Devices Sectional Committee and approval of the Medical Instruments, General and Production Engineering Division Council. The text of the ISO Standard has been approved as suitable for publication as an 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 in the International Standard while in Indian Standards, the current practice is to use a point (.) as the decimal marker. CROSS REFERENCES In the adopted standard reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence ISO : 1988 ISO System of IS 919 (Part 2) :1993 ISO system of Identical limits and fits Part 2: Tables of limits and fits: Part 2 Tables of standard tolerances grades and standard tolerances grades and limit limit deviations for holes and shafts deviations for holes and shafts (fist revision) 1s0 606 : 1994 Short pitch IS 2403 : ) Short pitch Identical with transmission precision roller chains transmission precision roller chains 1s0606:1982 and chain wheels and chain wheels (third revision) 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 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. ) Under Revision.

6 Is 15509:2004 Indian Standard DOUBLE-PITCH PRECISION ROLLER CHAINS AND SPROCKETS FOR TRANSMISSION AND CONVEYORS- 1 Scope This International Standard specifies requirements for double-pitch precision roller chains suitable for the mechanical transmission of power and for conveyors, together with those for their associated sprockets. It covers dimensions, tolerances, length measurement, proof testing and minimum tensile strengths. These double-pitch chains have been derived from some of the short-pitch transmission precision roller chains covered by ISO 606 having certain common dimensions but of double the pitch. The chains are intended for use under less onerous conditions with respect to speed and power transmitted than are the base chains from which they are derived. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and perties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edhions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 286-2:1988, ISO system of limits and fits Part 2: Tables of standard to/erance grades and limit deviations for holes and shafts. ISO 606:1984, Short-pitch transmission precision ro/- Ier chains and chain wheels. 3 Transmission chains 3.1 Nomenclatureof asaamblyand components The nomenclature of the chain assembly and its component parts is illustrated in figures 1 and 2; the figures do not define the actual form of the chain plates. Figure 1 Chain asaambly 1

7 IS 15509:2004 Rotl oiler Beoring/ pin # Bearing pin Bush m l!- Outer plate b) Inner link b) Outer link Ro Bu c) Detachable connecting link d) Single cranked link ~Roller Bush Inner plate -/ L Cranked plate Bearing pin, riveted J e) Double cranked link NOTES 1 Thedimensions of theplates arespecified intablel. 2 Fasteners may beofvarious designs, Drawings indcate some examples. Egure 2 Typesof link 2

8 IS 15509: Designation Double-pitch transmission precision roller chains shall be designated by the standard ISO chain numbers given in table 1. These chain numbers have been obtained by taking the ISO chain number for the base chain, given in ISO 606, and addhg the prefix 2. EXAMPLE 1 ChainISO (MB 3.3 Dimensions Chains shall conform to the dimensions shown in figure 3 and given in table 1. Maximum and minimum dimensions are specified to ensure interchangeability of links produced by different makers of chain. They represent limits for interchangeability, but are not the manufacturing tolerances. For the purposes of this International Standard, dimensions for the double-pitch simplex chains only are shown. 3.4 Tensile testing The minimum tensile strength is that value which shall be exceeded when a tensile force is applied to a sample which is tested to destruction as defined in This minimum tensile strength is not a working force. It is intended primarily as a comparative figure between chains of various constructions. For application information, the manufacturers or their published data should be consulted A tensile force, not less than that specified in table 1, shall be applied slowly to the ends of a chain length, containing at least five free pitches, by means of shackles permitting free movement on both sides of the chain centreline, in the normal plane of articulation The tensile test shall be considered a destructive test. Even though a chain may not visibly fail when subjected to a force equivalent to the minimum tensile strength, it will have been stressed beyond the yield point and will be unfit for service. 3.5 Proof testing It is recommended that all chains should be proof tested by applying a tensile force equivalent to onethird of the minimum tensile strength given in table Length accuracy Finished chains shall be measured but before lubricating. after proof testing The standard length for measurement shall be a minimum of a) 610 mm for ISO chain numbers 208A to 21OB inclusive, b) 1220 mm for ISO chain numbers 212A to 232B inclusive, and the chain shall terminate with an inner link at each end. The chain shall be suppofied throughout its entire length, and the measuring force given in table 1 shall be applied. The measured length shall be the nominal length subject to a tolerance of :15 Yo. The length accuracy of chains which have to work in parallel shall be within the above limits but matched by agreement with the manufacturer. Failure shall be considered to have occurred at the first point where increasing extension is no longer accompanied by increasing force, i.e. the summit of the force/extension diagram. 3.7 Marking The chains shall be marked with name or trademark. the manufacturer s Tests in which failures occur adjacent to the shackles shall be disregarded. It is recommended that the chains should be marked with the ISO chain number quoted in table 1.

9 IS 15509:2004 t-----i -l- - - %3+ 12 [j i-=-l Cranked link +--l Section of chain The chain path depth h, IS the minimum depth of channel through which the assembled chain with small rollers will pass. The overall width of a chain with a joint fastener is 64+ ~ for riveted pin end and fastener on one side, b,+ 1,6t+ for headed pin end and fastener on one side; b4 + for fasteners on both sides. Figure 3 Chains 4

10 mm N kn.... width Rollor Rolkar LsOtwaen Bearing Chain width Wtih Width Additional Bush Plate Crankad Pnatr diamatar batsvaen over widthfor Measuring T.nsila diarrretar pin body path Over inrsar bore dapth link2j (Srnalllll (Iarge)lI outer Lwaring joint foraa strength diameter depth inn.r link plataa plates pin faaton.rs) IBo chain p d, d, b 4 4 h, k /1 b f% b. b number max. max, min. max. min. mm. max. min. max. mm. max. max. min. 108A 25,4 7,95 15,88 7,85 3,98 4 t08b 25,4 8,51 15,88 7,75 4, ,33 12,07 12,07 11,81 6,9 11,18 11,31 17,8 3, ,8 6,9 11,3 11, , MOA 31,75 10,16 19,05 9,4 5,09 5, Z1OB ,16 19,05 9,65 5,08 5,13 14,99 15,09 8,4 13,fM 13,97 21,8 4, ,8 14,73 8,4 13,28 13,41 19,6 4,1 2KI 22,4!12A 38,1 11,91 22,23 12,57 5,88 5,98 18,34 18,08 9,9 17, , ,1!12B 38,1 12,07 22,23 ll,6a 5,72 5,77 16,39 16,13 9,9 15,62 15,75 22,7 4, !16A 50,8 15,6a 28,58 15,75 7,84 7,96 24,39 24, ,61 22,74 33,5 5, ,6!lBB 50,8 15,88 28,58 17,02 8,28 8,33 21,34 21, ,45 25,58 38,1 5, !20A 63,5 19,05 39,67 18,8 9,54!206 63,5 19,05 39,67 19,66 10,19 9,56 30,48 30, ,24 26,68 26, ,46 27,58 41,1 6, ,7 29,01 28,14 43,2 6, !24A 76,2 22,23 44,45 25,22 11,11 11,14 36,55 36,2 18,1 35,46 35,59 50,8 6, ,6!248 76,2 25,4 44,45 25,4 14,83 14,68 33,73 33,4 19,1 37,92 38,05 53,4 6, !28B 88,9 27,84 30,99 15,9 15,95!32B 101,6 29,21 30,88 17,81 17,86 37,46 42,72 37,08 21,3 46,58 46,71 65,1 7, rM 42,29 24,4 45,57 45,7 67,4 7, I) Large rollersare principallyfor conveyorchainsbut are scinetimes usad on transmissionchains;add suffix L to chainnumber. U Crankadlinksare not recommended for use cmchainswhich are intended for onerouscondkions, 3 The actual dimensionswill depend on the type of fastener used but they shouldnot exceed the dimensionsgivan, and shouldbe obtainedby the purchaserfrom the manufacturer.

11 IS 15509: Conveyor chains 4.1 General Except where otherwise stated, the shapes, dimensions and test details for the chain and sprockets shall conform to clauses 3 and 5, respectively, substituting reference to table 2 in place of table 1 where appropriate. It is usual for chains used for conveyor purposes to have straight-edged (not waisted) side plates. Additionally, an alternative large roller of diameter d, may be adopted. These features are,illustrated in figure Nomenclature The nomenclature of figure 2 is also applicable to conveyor chains. Figures 2 and 4 do not define the actual form of the chain plates. The length of the chain with attachments shall be the nominal length subject to the tolerance ~$~~? Marking The chains shall be marked with the manufacturer s name or trademark. It is recommended that the chains should be marked with the ISO chain number quoted in table Attachments General Except when otherwise stated, the dimensions and test details for the chain with attachments shall conform to clause Designation Two types of attachment are given, with the common dimensional basis.as given in table 3; their designation and distinguishing features are as follows: K1: with one attachment hole centrally located in each platform, Figure 4 Conveyorchainwith largerollers K2: with two attachment holes longitudinally located, as shown in figure Dimensions 4.3 Designation Double-pitch precision roller chains suitable for conveyor purposes are designated additionally with the prefix C when the straight-edged chain plates (figure 4) are used, and with a suffix L when the alternative large size roller (d7) k adopted. When necessary for the purpose of distinguishing between the chain roller sizes adopted, an optional suffix S may be applied to chains with the small roller. 4.4 Dimensions When the large roller size is adopted, dimension d, shall be replaced by d, in wheel formulae. Dimensions shall be in accordance with table Length accuracy The length of plain chain shall be the nominal length subject to the tolerance 0 5 o %0. Attachments shall conform to the dimensions given in table Manufacture The actual form of the K attachment plates is left to the discretion of the manufacturer, but the attachments are normally of integral construction, whereby the chain plates are extended and bent over to make the platform, as shown in figure 5. The length of the attachment plate is also left to the discretion of the manufacturer, but it should be sufficient to accommodate the attachment holes longitudinally in the case of type K2, and not interfere with the working of the adjoining links. A common length is normally adopted for both types KI and K Marking The marking shall be the same as would be shown on the chain plates replaced by an integral construction attachment. 6

12 IS 15509:2004 Table2 PrinciDaldimensions. measurhw forces and tensile strenaths m I I IIEI I 1 1.:1 I I liṫ 7

13 IS 15509:2004 Table 3 Dimensions of K attachment plates (see figure 5) Dimensions in millimetre ISO chain numberl) Transversediatanse Longitudinal&tanca Platform height Holediametar betweenhola cerrtree betweenhole centrea k f 4 g * 0,4 * 0,5 * 0,2 min. C 208A 9,1 25,4 3,3 9,5 C 208B 9,1 25,4 4,3 12,7 C 21OA 11,1 31,8 5,1 11,9 C 21OB 11,1 31,8 5,1 15,9 C 212A ,9 5,1 14,3 c 212A-H 14,7 42,9 5,1 14,3 C 212B 14,7 38,1 6,6 19,1 C 218A 19,1 55,6 6,6 19,1 C 216A-H 19,1 55,6 6,6 19,1 C 216B 19,1 50,8 6,6 25,4 C 220A 23,4 66,6 8,4 23,8 C 220A-H 23,4 66,6 8,4 23,8 C 220B 23,4 63,5 8,4 31,8 C 224A 27,8 79,3 10,5 28,6 C 224A-H 27,8 79,3 10,5 28,6 C 224B 27,8 76,2 10,5 36,1 C 232A-H 36,5 104,7 13,1 38,1 1) Heavy or higher-strength chains are designated with the suffix H, See the note=.- F-H---l I-+ +-)--i &}- ; l +. J-1--l U4-I-+-J-+--W % NOTE K2 attachment plates each have two attachment holes, K1 plates are similar except that they have one hole, located centrally (see 4.7.2). Figure 5 K attachment plates

14 IS 15509: Sprockets Diamatral dimensions 5.1 Nomenclature Pitch-drde diameter, d d= p The nomenclature for basic chain dimensions on sin 18~ which all sprocket data are based is given in figure 3 z and tables 1 and 2. Annex A gives the pitch-circle diameter for unit pitch as a function of the number of teeth. 5.2 Diametral dimensions and tooth shape Measuring pin diameter, ~ &=dl Nomenclature Nomenclature for diametral dimensions and tooth shape is given in figure Root diameter, ~ (+=d-dl subject to the tolerance limits given in table 4. l-% r / b, = b, = b, = d= 4= 4= d, = d, = ha = tooth side relief tooth width minimum width between inner plates pitch-circle diameter tip diameter root diameter absolute maximum shroud diameter maximum roller diameter height of tooth above pitch polygon P. r. = e = r, = rx = z. Z1 = a. chordal pitch, equal to chain pitch shroud fillet radius tooth flank radius roller seating radius tooth side radius number of teeth corresponding to the number of links that can be wrapped around the sprocket number of teeth for double-cut sprockets = 2Z rollerseatingangle h= maximum plate depth Figure 6 Diametral dimensions and tooth shape 9

15 IS 15509:2004 Table 4 Tolerance limits for root diameter The measurement over pins of sprockets with an even number of teeth shall be carried out over pins inserted in opposite tooth gaps. Root diameter, 4 mm upper deviation Lowar deviation The measurement over pins of sprockets with an odd number of teeth shall be carried out over pins in the tooth gaps most nearly opposite. I 4< ,25 mm 127<4 < ,3 mm 4>250 0 hill) 1) See ISO Measurement over pins (Seefi9ure7) For an even rwmber MR = d + dr min. For an odd number &fr= d COS of teeth: of teeth and single-cut sprockets: 90 ~ + dr min. For an odd number of teeth and double-cut sprockets: MR=dcos~ o + dfl min. The limits of tolerance for measurement over pins are identical to those for the corresponding root diameters. NOTE 1 Sprockets for double-pitch chains may be provided with either one set of teeth having a number of teeth equal to z or with two sets of teeth, the locationof the tooth spaces of the second set being midway between those of the first. In this case, the total number of teeth of the wheels will be z, = 22. In the case of a single set of teeth, z will be an integer. In the case of double-cut sprockets, z, will be an integer, but z will be fractional if z, is an odd number. Short-pitchbase chains should not be used with double-cut sprockets made for extended-pitch chains and viceversa <f? / I---J4 v Even number of teeth Odd number of teeth Single- and double-cut teeth F*1 tine = z Oash-dotted line= 22 d= 4= 4= MR = P= pitch-circle diameter root diameter measuring pin diameter measurement over pins chordal pitch, equal to chain pitch Figure 7 Measuring pin size 10

16 Is 1550s : Tip diameter d, max. = d + 0,625p d, ( 04 d.min. =d+p 0,5-~ d, ) It should be noted that ~ max. and ~ min. can be applied arbitrarily both to the minimum and maximum tooth gap forms, subject to the limitations imposed by the cutter on the maximum diameter. To facilitate the construction of the tooth gap form to a large scale on a drawing board, the tooth height above the pitch polygon can be obtained from the following formulae: ~ max. =p 0, ~ - 0,5dT ( ) ~ min. =p 0,25 + ~ - 0,5d1 ( ) Note that ~ max. is related to ~ max. and & min. to d, min Tooth width 4= 0,95b1: hl~) NOTE 2 4 = 0,931q:h14 may be used by agreement between user and manufacturer Tooth aide relief b, mm = 0,065p Absolute maximum shroud diameter ~=pcot J+ 1,05~ -1-2ra mm Tooth aide radius x nom= 015P 5.3 Radialrun-out Radial run-out, measured on one complete turn of the sprocket, with reference to the bore and root diameter, shall not exceed a total indicator reading greater than the larger of the two following values: 0,000 ~ + 0,08 mm, or 0,15 mm, up to a maximum of 0,76 mm Tooth gap form The actual tooth gap form which is provided by cutting or by an equivalent method shall have tooth flanks of a form lying within the minimum and maximum flank radii and blending smoothly with the roller seating curve subtending the respective angles Minimum form r~max. = 0,12dl(z + 2) r{ min. = 0,505d1 5.4 Axialrun-out (wobble) Axial run-out, measured on one complete turn of the sprocket with reference to the bore and the flat part of the side face of the teeth, shall not exceed a total indicator reading of 0,000 ~ + 0,08 mm, up to a maximum of 1,14 mm. For fabricated (welded) sprockets, a minimum of 0,25 mm may be accepted if the above formula gives smaller values. 5.5 Pfichacouracyof sprocketteeth Pitch accuracy of sprocket teeth is important and chain manufacturers should be consulted for details Maximum form r, min. = 0,008d1 (Z ) q max. = 0,505d1 + 0,069 ~ ~min.=12~-* 5.6 Preferredrangeof teeth This International Standard primarily applies to a range of teeth from 5 to 75 inclusive (with interrndate numbers of teeth 5 1/2 to 74 1/2 inclusive). The preferred range of numbers of teeth is 7, 9, 10, 11, 13, 19, 27, 38 and 57. ) See ISO

17 Is 15509: Bore tolerance a) manufacturer s name or trademark; Unless otherwise agreed between the manufacturer b) number of teeth; and the purchaser, bore tolerances shall be H&l. c) chain designation (the ISO chain number or 5.8 Marking manufacturer sequivalent). It is recommended that sprockets should be marked with the following: ) See ISO

18 Is 15509:2004 Annex A (normative) Ptich-circlediameters Table A. 1 gives the correct pitch-circle diameters for sprockets to suit a chain of unit pitch. The pitch-circle diameters for s-prockets to suit a chain of any other pitch are directly proportional to the pitch of the chain. Table A.1 Pfich-circlediematers Pfich-circle Pitch-circlo Pitch-circlo Pnch.circle Number of diameter,d, Number of diemeter,d, Number of diemetef,d, Number of diemeter,d, teeth for unit teeth for unit teeth for unit teeth for unit pitchl) Pitchl) - ) ml) z z z z 5 1, , , la,7e , , , ,e4a , , , , , , , , , , , , , , , , ,2862 u 14, , /2 2, !2 a, /2 14, , , ,613a 45 14, , ,079e 27 fi2 8, , /2 20, , a, , , , %12 9, /2 140a , , , , ,69e 2 11 IJ2 3, , ,130a , , , , , IJ2 4, f12 9, ,446 a , , , , , , , , /2 21, , , , , , , , , , , , , , , , , , , , , , , , !2 22, , , , , /2 5, , , , , , , /2 5, , , , , , , ,243 a , /2 11, w 17, , , , , , , , , , , , , /2 6, !2 12, /2 16, , , , , , /2 18, ) TtrIs IS sometimes referred to as unit pitch-circle diameter. 23,

19 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Mian 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 the 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. MGP 30 (0286). Amendments Issued Since Publication Amend No. Date of Issue Text Affected Headquarters : BUREAU OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi Telegrams : Manaksanstha Telephones : , , (Common to all offices) Regional Offices : Telephone Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI { Eastern : 1/14 C.I.T. Scheme Vll M, V. 1.P. Road, Kankurgachi , KOLKATA { , Northern : SCO , Sector 34-A, CHANDIGARH Southern : C.I.T. Campus, IV Cross Road, CHENNAI Western : Manakalaya, E9 MlDC, Marol, Andheri (East) , MUMBAI { , Branches : 4HMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. SHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. IVALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPU RAM. VISAKHAPATNAM. { { , , Printed at Prabhat Offset Press, New Delhi-2