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/ISO 2953 (1999): Mechanical vibration - Balancing machines - Description and evaluation [MED 28: Mechanical Vibration and Shock] “!ा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” 1S/1S0 2953:1999 (Superseding IS 13277: 1992) Indian Standard MECHANICAL VIBRATION — BALANCING MACHINES — DESCRIPTION AND EVALUATION ICS 21.120.40 @ BIS 2007 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 September 2007 Price Group 14 Mechanical Vibration and Shock Sectional Committee, MED 28 NATIONAL FOREWORD This Indian Standard which is identical with ISO 2953 : 1999 ‘Mechanical vibration — Balancing machines — Description and evaluation’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation Qf the Mechanical Vibration and Shock Sectional Committee and approval of the Mechanical Engineering Division Council. This standard supersedes IS 13277:1992 ‘Balancing machines — Description and evaluation’. The text of 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 Standards, while in Indian Standards, the current practice is to use a point (.) as the decimal marker, In this adopted standard, reference appears to the following International Standard for which Indian Standard also exists. The corresponding Indian Standard, which is to be substituted in its respective place, is listed below along with its degree of equivalence for the edition indicated: International Standard Corresponding Indian Standard Degree of , Equivalence ISO 1925 : 19901) Mechanical vibration 1S/1S0 1925:2001 Mechanical vibration Identical — Balancing — Vocabulary — Balancing — Vocabulary For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculat ed, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘R ules 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. ‘)Since revised in2001and adopted as 1S/1S01925:2001. 1S/1S0 2953:1999 indian Standard MECHANICAL VIBRATION — BALANCING MACHINES — DESCRIPTION AND EVALUATION 1 Scope This International Standard gives requirements for the evaluation of the performance and characteristics of machines for balancing rotating components. It stresses the importance attached to the form in which the balancing machine characteristics should be specified by the manufacturers and also outlines criteria and tests for evaluating balancing machines. Adoption of the format suggested in 4.1 and 4.2 makes it easier for the user to compare products of the different manufacturers. Guidance as to the manner in which users should state their requirements is given in annex B. Details of proving rotors, test masses and performance tests to be employed to ensure compliance with specified unbalance indicating capability are given. Tests for other machine capacities and performance parameters are not contained in this International Standard. Annex Edescribes recommended modifications of old 1S0 proving rotors. This International Standard does not specify balancing criteria; these are specified in ISO 1940-1. This International Standard is applicable to balancing machines that support and rotate workplaces which are rigid at balancing speed, and that indicate the amounts and angular locations of required unbalance corrections in one or more planes. It covers both the machines that measure out-of-balance effects on soft bearings and those that measure this on hard bearings. Technical requirements for such balancing machines are included, however, special features, such as those associated with automatic correction, are excluded. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this international Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and LSO maintain registers of currently valid International Standards. ISO 1925:1990, Mechanical vibration — Balancing — Vocabula~. 3 Definitions For the purposes of this International Standard, the definitions given in ISO 1925 and those given in annex A apply. 4 Capacity and performance data of the machine The manufacturer shall specify the data listed in 4.1 for horizontal or 4.2 for vertical machines respectively, as applicable, and in a similar format. 1 1S/1S02953 1999 4.1 Data of horizontal machines 4.1.1 Rotor mass and unbalance limitations 4.1.1.1 The maximum mass of rotorwhich can be balanced shall be stated over the range ofbalancing speeds. The maximum moment of inertia [(mass x (radius of gyration)2] of a rotor with respect to the shaft axis which the machine can accelerate in a stated acceleration time shall be given for the range of balancing speeds (/+, f?2,...) together with the corresponding cycle rate (see table 1). Table 1— Data of horizontal machines Manufacture ............................................ Model ................................................... Balancing speeds orspeed ranges (see also 4.1.3.1) n, n2 n3 n4 rr5 Rotor mass kg maximum [see note 1) minimum occasional overload face per SUppOfl N (see note 1) Maximum negative force per support N (see note 1) Maximum rotormoment of inertia with respect tothe shaft axis (see note 2) kg.mz Cycle rate (see note 2) Maximum unbalance g.mm/kg org.mm measurable (see note 3) permissible a) For inboard rotors Minimum achievable residual specific unbalance, maximum mass emar,g,mm/kg (see note 4 and clause 6) 0,2 x max. mass minimum mass Corresponding deflection ofanal o g amount-of- maximum mass unbalance indicator, mm Number ofdigital units (see note 4) 0,2 x max. mass minimum mass” b) For outboard rotors Minimum achievable residual specific unbalance, maximum mass emar,g.mm}kg (see note 4 and clause 6) 0,2 x max. mass minimum mass Corresponding deflection ofanalog amount-of- unbalance indicator, mm maximum mass Number ofdigital units (see note 4) 0,2 x max. mass minimum mass 2 1S/1S0 2953:1999 4.1.1.2 Production efficiency (see clause 7) shall be stated, as follows. 4.1.1.2.1 Time per measuring run: a) Time for mechanical adjustment: ......................................................................... s b) Time for setting indicating system: ...................................................................... s c) Time for preparation of rotor ............................................................................... s d) Average acceleration time: .................................................................................. s e) Reading time (including time to stabilize): ........................................................... s f) Average deceleration time: .................................................................................. s . 9) Relating readings to rotoc ................................................................................... s h) Other necessary time: ......................................................................................... s i) Total time per measuring run [a) to h) above]: ................................................... s 4.1.1.2.2 Unbalance reduction ratio for inboard rotors: ............................................ 70 4.1.1 .2.3 Unbalance reduction ratio for outboard rotors: .......................................... 70 4.1.2 Rotor dimensions 4.1.2.1 Adequate envelope drawings of the pedestals and of other obstructions, such as belt-drive mechanism, shroud mounting pads, thrust arms and tie bars, shall be supplied to enable the user to determine the maximum rotor envelope that can be accommodated and the tooling and/or adaptors required. A combination of large journal diameter and high balancing speed may result in an excessive journal peripheral speed. The maximum journal peripheral speed shall be stated. When belt drive is supplied, balancing speeds shall be stated for both the maximum and minimum diameters over which the belt can drive, or other c onvenient diameter. The manufacturer shall state ifthe axial position of the drive can be adjusted. 4.1.2.2 Rotor envelope Iimitati!ms (see figure 1) shall be stated. 4.1.2.3 Rotor diameter: a) Maximum diameter over bed: .............................................................................. mm b) Maximum diameter over which belt can drive: .................................................... mm c) Minimum diameter over which belt can drive: ..................................................... mm 4.1.2.4 Distance between journal centrelines: a) Maximum: ............................................................................................................ mm b) Minimum: ............................................................................................................. mm c) Maximum distance from coupling flange to centreline of farthest bearing: .......... mm d) Minimum distance from coupling flange to centreline of nearest bearing: ........... mm 3 1S/1S0 2953:1999 ._—. . 1 2 & —.—. — 1 .—. — .—. s -s 1- J 4 3 /3 \ 4 // V/z//” 7/7/ Key 1 Shaft 2 Rotor 3 Suppolt 4 Bed NOTE 1 Ifthe left-hand support isnotamirror image ofthe right-hand suppoti, separate dimensions shall beshown. NOTE 2 The profile ofthe belt-drive equipment shall beshown, ifapplicable. Figure 1— Example of machine support drawing illustrating rotor envelope limitations 1S/1S0 2953:1999 4.1.2.5 Journal diameter: a) Maximum: ............................................................................................................ mm b) Minimum: ............................................................................................................. mm Maximum permissible peripheral journal speed ......................................................... mts 4.1.2.6 Correction plane limitations (consistent with the statements in 5.4) shall be stated. 4.1.2.7 Correction plane interference ratios (consistent with the statements in 5.4 and based on the proving rotor) shall be stated. 4.1.3 Drive 4.1.3.1 Rated torque on workpiece Nm n, ........................ n2 ......................... n3 ................ ...!.... ., ..,! n4 .......... .......... rr5 .............................. n6 .............................. .............................. 9 n8 .............................. or or steplessly variable steplessly variable from ............................. .............................. to ................................. .............................. 4.1.3.2 Torque (see note 5): a) Zero-speed torque: .......................................... YOrated torque on workpiece b) Run-up torque adjustable from ......... to ......... ‘%0rated torque on workpiece c) Peak torque ..................................................... ?’orated torque on workpiece 4.1.3.3 Type of drive to workpiece (see note 6): ............................................ 4.1.3.4 Prime mover (type of motor): ............................................................. a) Rated powec ............................................................................................ kW b) Motor speed: ............................................................................................. r/rein c) Power supply, voltage/ frequency/ phase: ............................................. 4.1.3.5 Brake a) Type of brake: ........................................................................................... b) Braking torque adjustable from .............. to ......... YOof rated torque 5