BRITISH STANDARD Safety requirements for bonded abrasive products ICS 25.100.70 BS EN 12413:2007 +A1:2011 BS EN 12413:2007+A1:2011 National foreword This British Standard is the UK implementation of EN 12413:2007+A1:2011 It supersedes BS EN 12413:2007 which is withdrawn The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by !" The UK participation in its preparation was entrusted to Technical Committee MTE/13, Grinding wheels, abrasive tools, paper and cloths, and powders A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 © BSI 2011 ISBN 978 580 72232 Amendments/corrigenda issued since publication Date Comments 31 July 2011 Implementation of CEN amendment A1:2011 EUROPEAN STANDARD EN 12413:2007+A1 NORME EUROPÉENNE EUROPÄISCHE NORM March 2011 ICS 25.100.70 Supersedes EN 12413:2007 English Version Safety requirements for bonded abrasive products Exigences de sécurité pour les produits abrasifs agglomérés Sicherheitsanforderungen für Schleifkörper aus gebundenem Schleifmittel This European Standard was approved by CEN on 10 May 2007 and includes Amendment approved by CEN on 17 January 2011 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 12413:2007+A1:2011: E BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Contents Page Foreword 3 Introduction 5 1 Scope 6 2 Normative references 6 3 3.1 3.2 3.3 3.4 3.5 Definitions and symbols 6 Bonded abrasive products 6 Grinding machines 6 Grinding method 7 Type of application 7 Symbols 9 4 List of significant hazards 10 5 5.1 5.2 5.3 5.4 5.5 5.6 Requirements 10 General requirements 10 Strength requirements 11 Dimensional requirements 12 Admissible unbalance 32 Marking 32 Blotters 32 6 6.1 6.2 Verification of the requirements and inspection 32 Verification methods 32 Scope of inspection by the manufacturer 33 7 Information for use 35 Annex A (normative) Marking 36 A.1 Content of marking 36 A.2 Execution of marking 39 Annex B (informative) Mounted points 40 B.1 Example calculation of the maximum permissible speeds of rotation 40 B.2 Example for application of the calculation method 44 Annex C (normative) Verification methods for side load capacity 46 C.1 General 46 C.2 Single point side load 46 C.3 Three point side load 47 C.4 Impact test 48 Annex D (informative) Colour codes 49 Annex E (informative) Speed conversion table 50 Bibliography 51 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Foreword This document (EN 12413:2007+A1:2011) has been prepared by Technical Committee CEN/TC 143 “Machine tools — Safety”, the secretariat of which is held by SNV This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2011, and conflicting national standards shall be withdrawn at the latest by September 2011 This document includes Amendment 1, approved by CEN on 2011-01-17 This document supersedes !EN 12413:2007" The start and finish of text introduced or altered by amendment is indicated in the text by tags ! " Significant technical differences between !EN 12413:2007" and EN 12413:1999 are as follows: a) deletion of different abbreviations in Table to Table and Table 7; b) deletion of 140 m/s and 160 m/s in Clause 5.1.1; c) revision of Table 11 "Maximum operating speeds, safety factors and minimum bursting speeds for different types of machine and types of application" In the revised Table 11 (now Table 4) are there only relations between the range of vs, the safety factor Sbr and burst speed factor fbr; d) in Clause 5.1.3 "Side load capacity" (new Clause 5.2.3) are the relevant values for the different tests depending on vs and the outside diameter of the abrasive product; e) extension of requirements in Clause 5.6 "Blotters", Annex B "Blotters" (normative) is completely deleted; f) revision of Clause in accordance with rules for the structure and drafting of CEN/CENELEC publications; g) Table 13 "Safety test speeds" deleted and revision of Table 14 "Scope of the inspection"; h) revision of Clause "Information for use"; i) content of Table A.2 "Colour codes and design of colour codes" to change as additional marking in Annex D (informative); j) in Table A.3 "Restrictions of use", RE2 deleted and RE8 included; k) Figures A.1, A.2 and Clause A.4 "Design of the marking" deleted; l) revision of Annex C (normative), [now Annex B (informative)], Mounted points only as an example calculation of the maximum permissible speed of rotation; m) extension of Annex D (informative), [now Annex C (normative)], with additional requirements concerning the verification methods for side load capacity !Significant technical differences between EN 12413:2007+A1:2011 and EN 12413:2007 are as follows: n) in 6.2, Table 7, the requirements for the scope of inspection of "all other abrasive products" have been changed." BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Introduction This standard has been prepared to provide one means of conforming with essential safety requirements, e.g of the Safety Product Directive and associated EFTA regulations This standard is addressed to designers, manufacturers and suppliers of the abrasive products described in the scope In addition, it helps designers, manufacturers and suppliers of grinding machines in the selection of abrasive products, in order to reduce the risks and achieve conformity of the respective machinery with the Essential safety requirements of the Machinery Directive The extent to which hazards are covered is indicated in the scope of this standard BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Scope This standard is applicable to rotating bonded abrasive products It specifies requirements and/or measures for the removal or reduction of hazards resulting from the design and application of the abrasive products This standard also contains procedures and tests for verification of compliance with the requirements as well as safety information for use, which is to be made available to the user by the manufacturer The hazards taken into consideration are listed in Clause of this standard This standard does not apply to superabrasives and coated abrasive products Normative references The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN ISO 6103, Bonded abrasive products — Permissible unbalances of grinding wheels as delivered — Static testing (ISO 6103:2005) ISO 525, Bonded abrasive products — General requirements ISO 13942, Bonded abrasive products — Limit deviations and run-out tolerances Definitions and symbols 3.1 Bonded abrasive products Products consisting of abrasives e.g aluminium oxide, silicon carbide held together by a bond Bonded abrasive products within the meaning of this standard are all products as defined, see for example by ISO 525 3.2 3.2.1 Grinding machines Stationary machines Machines that are fixed in position during operation, see for example EN 13218 Included are fixed swing-frame machines and mobile machines clamped firmly in position during use 3.2.2 Mobile machines Machines that are not fixed in position during operation They are manually guided (but not supported) by hand during use, e.g floor grinding machines, flexibly suspended swing-frame grinding machines 3.2.3 Hand-held machines Machines, including those with flexible drives that are held in the hand during the grinding process, see for example EN 792-7, EN 792-9, EN 60745-2-3 and EN ISO 19432 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) 3.2.4 Machines with totally enclosed working area Stationary machines that are protected in such a way by separating guards that machining processes including loading and unloading of workpieces are carried out inside them and persons are protected against hazards generated by bursting of an abrasive product 3.3 3.3.1 Grinding method Peripheral grinding Grinding with the periphery of the wheel with no or limited side loads 3.3.2 Face grinding Grinding with the face of the wheel 3.3.3 Cutting-off Cutting-off or slotting with the periphery of the cutting-off wheel 3.3.4 High pressure grinding Grinding with high contact pressure for steel conditioning 3.4 3.4.1 Type of application General See Table 3.4.2 Mechanically guided grinding Feed movements of the grinding tool and/or the workpiece are guided by mechanical means 3.4.3 Manually guided grinding Feed movements of the grinding tool and/or the workpiece are manually guided by the operator 3.4.4 Hand-held grinding Grinding machine is entirely guided by the operator's hands BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Table — Type of application Type of grinding machine Stationary machines Type of application Mechanically guided grinding Stationary and mobile machines Manually guided grinding Hand-held machines Hand-held grinding Abrasive product Workpiece Fixed Guided mechanically Guided mechanically Fixed Guided mechanically Guided mechanically Guided by hand Fixed Fixed Guided by hand Guided by hand Fixed BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Table A.2 — Restrictions of use (RE) Short sign Restriction to use Description Pictogram Abrasive product only for use on stationary machines RE1 Not permitted for hand-held machines RE3 Not permitted for wet grinding Abrasive product only suitable for dry grinding RE4 Only permitted for totally enclosed working area Abrasive product only for use on stationary machines the guarding of which is accepted as TOTALLY ENCLOSED WORKING AREA Remark: This restriction only applies to abrasive products not for use on hand-held machines but capable of being mounted on such machines Abrasive product only for use on cutting-off RE6 Not permitted for face grinding Remark: This restriction only applies to abrasive products for use on hand-held machines RE8 Only permitted with back-up pad Abrasive product only for use with additional appropriate back-up pad NOTE Colour design of the symbols in accordance with ISO 3864-2, wherever possible A.1.2 Additional inscriptions A.1.2.1 General Additional inscriptions on the abrasive products such as ISO type number and manufacturer's product name is permitted provided legibility of the data required according to Table A.1 is not impaired A.1.2.2 Abrasive products for hand-held machines Abrasive products with type of bond B and BF for use on hand-held grinding machines or hand-held cutting-off machines shall be marked with a date of expiry The date of expiry shall at the longest be within years from the date of manufacture It is expressed as month and year e.g 04/2009 Abrasive products for the use on hand-held grinding and cutting-off machines may in addition be marked with information on the type of workable material 38 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) A.1.2.3 Oriented wheels If wheels need to be mounted in a specific position on the spindle they shall be marked in such a way as to clearly indicate in this position A.1.2.4 Multiple or gang mounted wheels Wheels to be multiple or gang mounted shall be marked in a manner to assure they are correctly mounted on the machine spindle, additionally each wheel shall be identified as being part of that set A.1.2.5 Magnesite bond Abrasive products with magnesite bond shall be marked with a date of expiry The date of expiry shall at the longest be within year from the date of manufacture It is expressed as month and year e.g 04/2009 A.2 Execution of marking The marking shall be indelible and legible Where possible the marking shall be on the abrasive product It can be on the product itself, on a fixed blotter or on a fixed label The traceability code can be either on the product or smallest package For products over 80 mm outside diameter when it is not possible to give all specified information on the abrasive product, blotter or label, the abrasive product itself shall at least be marked with the maximum operating speed in so far as the surface and shape of the abrasive product permits For products with an outside diameter of D ≤ 80 mm, mounted points and wheels and segments, the specified information can appear on a label fixed to the smallest packaging unit 39 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Annex B (informative) Mounted points B.1 Example calculation of the maximum permissible speeds of rotation According to 5.2.2, mounted wheels and points shall have a safety factor against deflection of the spindle of Sab = 1,3 The deflection speed of rotation of the spindle strongly depends on the unsupported overhang of the mounted point In order to ensure compliance with the safety factor for every length of spindle within the collet the maximum permissible speed of rotation shall be given as a function of the unsupported overhang see A.1.1, Table A.1, column The maximum permissible speed of rotation as a function of the unsupported overhang may be determined by calculation, with the following relations (used symbols, see Table B.2): Sab = nab with Sab = 1,3 nmax (B.1) and nab = 30 106 π e ⋅ M ⋅ LM M ⋅ L3M + 3⋅ E ⋅l W ⋅ Re (B.2) with l= π 64 ⋅ S and W = π 32 S3 (B.3) The approximate centre of gravity distance LM and the reduced mass M shall be determined as a function of the shape of the mounted point, see Table B.1 40 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Table B.1 — Approximate centre of gravity distance LM and reduced mass M Mounted points Gravity distance LM and reduced mass M Cylindrical shape LM = L0 + M = msr + D ⋅ T − L2s ⋅ Sa2 ⋅ D ⋅ T − ⋅ Ls ⋅ Sa2 π ( ) ⋅ ρ k ⋅ D ⋅ T − Ls ⋅ Sa2 ⋅ 10 − Key Collet Conical shape LM 77 ⋅ D ⋅ T − L2s ⋅ Sa2 = L0 + 168 2⋅ ⋅ D ⋅ T − Ls ⋅ Sa2 12 M = msr + π ⋅ ρk ⋅ ⋅ D ⋅ T − Ls ⋅ Sa2 ⋅ 10 − 12 Key Collet Spherical shape LM 1 ⋅ D − ⋅ L2s ⋅ Sa2 = L0 + 3 ⋅ D − Ls ⋅ Sa2 M = msr + π 2 ⋅ ρ k ⋅ ⋅ D3 − Ls ⋅ Sa2 ⋅ 10 − 3 Key Collet Cylindrical shape with round end LM 1 ⋅ D ⋅ T − ⋅ D ⋅ T + ⋅ D − L2s ⋅ Sa2 24 = L0 + D ⋅ T − ⋅ D − Ls ⋅ Sa2 M = msr + Key Collet π ⋅ ρk ⋅ D2 D ⋅ T − − Ls ⋅ Sa2 ⋅ 10− 41 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Table B.1 (continued) Mounted points Gravity distance LM and reduced mass M Cylindrical shape with conical end (full point) LM 2⋅ 3 ⋅ D ⋅ T + ⋅ D − L2s ⋅ Sa2 D2 ⋅ T − = L0 + ⋅ D − Ls ⋅ Sa2 ⋅ D ⋅ T − M = msr + ⋅ ρk ⋅ D2 π ⋅ T − ⋅ D − Ls ⋅ Sa2 ⋅ 10 − Key Collet Cylindrical shape with conical end (truncated end) ⋅ D ⋅T + ⋅ D − L2s ⋅ Sa2 D2 ⋅ T − 24 128 LM = L0 + ⋅ D − Ls ⋅ Sa2 ⋅ D ⋅ T − 48 M = msr + Key Collet Ogival shape LM Taper cup shape ⋅ T − ⋅ D − Ls ⋅ Sa2 ⋅ 10 − 48 D2 ⋅ T − = L0 + ⋅ D2 ⋅ D ⋅ T + ⋅ D − L2s ⋅ Sa2 ⋅ T − ⋅ D − Ls ⋅ S a2 ⋅ ρk ⋅ D2 ⋅ T − ⋅ D − Ls ⋅ Sa2 ⋅ 10 − M = msr + Key Collet ⋅ ρk ⋅ D2 π π 2 ⋅ Ls ⋅ Sa = L0 + 0,1628 ⋅ D ⋅ T − ⋅ Ls ⋅ Sa2 0,0852 ⋅ D ⋅ T − LM S2 M = msr + π ⋅ ρ k ⋅ 0,1628 ⋅ D ⋅ T − Ls ⋅ a ⋅ 10 − Key Collet 42 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Table B.2 — Symbols and further calculation quantities Abbreviations Designation Unit D Outside diameter of mounted point [mm] L0 Unsupported overhang [mm] Sd Spindle diameter [mm] L2 Length of spindle [mm] L3 Clamping length of mounted point [mm] T Overall thickness of mounted point [mm] E Modulus of elasticity of the spindle material [N/mm ] Re Yield point of the spindle material [N/mm ] e Mass eccentricity [mm] ρs Specific density of spindle material [g/cm ] ρk Specific density of the abrasive product [g/cm ] Km Reducing factor of massa msr Reduced mass of spindleb [g] mk Mass of mounted point without spindle [g] ms Mass of spindle [g] 2 3 — Spindle length inside abrasive product Ls — for all other shapes (Ls = 0,4 T) [mm] [mm] Km is calculated with following formulae: 33 Km = b for cylindrical shape (Ls = 0,5 T) Diameter of spindle inside the abrasive product (Sa = Sd) for plain spindle Sa a — 140 + 239 ⋅ 720 m 1+ ⋅ s mK ms mK msr is calculated as follows: S −3 msr = K m ⋅ π ⋅ d ⋅ ρs ⋅ (L0 + Ls ) ⋅ 10 43 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) B.2 Example for application of the calculation method B.2.1 Mounted point cylindrical shape Key Collet Figure B.1 44 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) B.2.2 Assumptions for the calculation Table B.3 — Characteristics for the calculation of maximum permissible speed of rotation Unsupported overhangs L0 5, 10, 15, 20, 25 and 30 mm Limit deviation of spindle diameter Sd h9 Limit deviation of length of spindle L2 ± mm Modulus of elasticity of the spindle material E = 210 000 N/mm Yield point of the spindle material Re = 300 N/mm Mass eccentricity e = 0,2 mm Specific density of spindle material ρs = 7,85 g/cm3 Density of the abrasive product ρk = 2,5 g/cm3 2 B.2.3 Maximum permissible speeds of rotation Table B.4 — Mounted points cylindrical shape with Sd = mm spindle diameter D 25 32 40 50 63 T 32 40 50 32 40 20 32 40 13 25 40 10 16 25 Sd L2 40 40 40 40 40 Maximum permissible speeds of rotation nmax for overhang length L0 38 100 38 100 38 000 29 800 29 800 23 800 23 800 23 800 19 000 19 000 19 000 19 000 15 100 15 100 15 100 10 38 100 38 100 33 000 29 800 29 800 23 800 23 800 23 800 19 000 19 000 19 000 19 000 15 100 15 100 15 100 15 38 100 36 600 28 900 29 800 28 700 23 800 23 800 23 000 19 000 19 000 19 000 18 400 15 100 15 100 15 100 20 38 100 32 100 25 600 29 800 25 200 23 800 23 800 20 200 19 000 19 000 19 000 16 200 15 100 15 100 15 100 25 34 700 28 300 22 700 27 300 22 300 23 800 22 000 17 900 19 000 19 000 19 000 14 300 15 100 15 100 15 100 30 30 600 25 200 20 300 24 200 19 800 23 800 19 500 15 900 19 000 19 000 19 000 12 800 15 100 15 100 15 100 45 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Annex C (normative) Verification methods for side load capacity C.1 General Verification of compliance with the requirements for side load capacity according to 5.2.3 is effected with the following methods For all methods, the abrasive product under test is mounted to a rotating spindle by means of flanges The flanges have the dimensions given in Table C.1 Table C.1 — Outside diameters of flanges for mounting abrasive products for the determination of the side load capacity Type of abrasive product Outside diameter D mm Depressed-centre grinding wheels, straight and depressed-centre cutting-off wheels 115 ≤ D ≤ 230 300 350/356 400/406 Type of grinding machine Hand-held grinding and cutting-off machines Outside diameter of flanges DF mm 41 100 117 133 C.2 Single point side load The rotating abrasive product is laterally loaded by means of a live pressure roll steadily fed in the direction of the axis until rupture (Figure C.1) The ball bearing pressure roll has an outside diameter between 70 mm and 80 mm, a width of 25 mm and a convexity of 25 mm It is engaged to one of the lateral faces of cutting-off wheels and to the face used for grinding of depressed-centre grinding wheels The distance R between the point of application of the force of the pressure roll and the axis of rotation of the abrasive product is R= D − 18 mm (C.1) The abrasive product shall rotate with the specified maximum operating speed The pressure roll is applied with a feeding rate of mm/s until rupture of the abrasive product The force acting on the pressure roll in the feed direction, the single point side load FS1, is measured 46 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Key Abrasive product Feed Measuring box Pressure roll Direction of rotation Figure C.1 — Single point side load test C.3 Three point side load The rotating abrasive product is supported at the rear by two staggered live back-up rolls and loaded at the front by a live pressure roll which is in the centre between the rear back-up rolls and applied in the direction of the axis until rupture (Figure C.2) Key Abrasive product Feed Measuring box Pressure roll Support pillar Direction of rotation Figure C.2 — Three point side load test The conditions of test correspond to those of the single side load test in Clause C.1 The force acting on the pressure roll in the feed direction, the three point side load FS3, is measured 47 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) C.4 Impact test The rotating abrasive product is laterally loaded with one or several impacts supplied successively by means of a pendulum testing machine until rupture (Figure C.3) The pendulum testing machine consists of a frame, inside which a pivotable pendulum with striker and, if necessary, additional mass, is mounted Its potential working capacity is adjustable in 50 steps up to 20 Nm (without additional mass) or 42 Nm (with additional mass) The force is applied by means of a striker with a diameter of 30 mm, an unsupported length of 115 mm and a maximum radius of 40 mm The striker is engaged to one of the lateral faces of cutting-off wheels and to the lateral face used for grinding of depressed centre grinding wheels The distance R between the point of application of the striker of the pendulum testing machine and the axis of rotation of the abrasive product shall be R= D − 18 mm (C.2) The abrasive product rotates with the specified maximum operating speed and is at first loaded with the required minimum working capacity values required in Table C.1 and inspected for visible damages If no damage is visible to the naked eye, the test is repeated with higher working capacities to be set on the pendulum testing machine Both the highest working capacity at which still no visible damages have occurred and the working capacity of the next higher grade and the resulting damages are being determined Key Abrasive product Striker Detent pawl Pedulum Direction of rotation Figure C.3 — Impact test 48 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Annex D (informative) Colour codes Colour codes can be used as additional marking of the maximum operating speed, see Table A.1 If they are used, the requirements of Table D.1 shall be met Colour codes shall only be applied for the discrete speed values given in Table D.1 Intermediate speeds shall not have a colour stripe Table D.1 — Colour codes and design of colour codes Maximum operating speed vs Colour code Number and Colour Width of colour stripe Width of gap mm to 20 mm — mm to 20 mm each at least mm, not greater than width of a colour stripe m/s 50 × blue 63 × yellow 80 × red 100 125 × green × blue × yellow Colour code stripes shall extend through the centre and across the whole diameter of the abrasive product or the label They shall be straight and of even width A colour design of the label shall not impair the clear recognisability of the colour code Abrasive products in magnesite bond shall be marked with a white colour code independently from their maximum operating speeds 49 BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Annex E (informative) Speed conversion table1) Wheel diameter D 32 35 Peripheral speed v m/s 40 45 Speed of rotation 1/min or rpm 16 20 25 51 000 64 000 80 000 38 200 48 000 60 000 76 500 84 000 95 500 107 430 120 000 150 500 191 000 10 30 600 38 200 48 000 61 200 67 000 76 500 86 000 95 500 120 500 153 000 191 000 13 23 550 29 500 35 600 47 100 51 500 58 800 66 500 73 500 92 600 118 000 147 000 184 000 16 19 100 23 900 29 850 38 200 41 800 47 800 54 000 59 700 75 200 95 500 120 000 150 000 20 15 300 19 100 23 900 30 600 33 500 38 200 43 000 47 800 60 200 76 500 95 500 120 000 25 12 300 15 300 19 100 24 500 26 800 30 600 34 400 38 200 48 200 61 200 76 500 95 500 32 550 11 950 14 950 29 100 20 900 23 900 26 900 30 000 37 600 48 000 60 000 75 000 40 650 550 11 950 15 300 16 750 19 100 21 500 23 900 30 100 38 200 47 200 59 700 50 150 650 550 12 250 13 400 15 300 17 200 19 100 24 100 30 600 38 200 47 750 63 850 100 600 750 10 650 12 150 13 650 15 200 19 100 24 300 30 250 37 900 mm 50 63 80 100 125 102 000 112 000 128 000 143 240 160 000 201 000 80 850 800 000 650 400 550 10 750 12 000 15 100 19 100 23 900 29 850 100 100 850 800 150 700 650 600 550 12 100 15 300 19 100 23 900 115 700 350 200 350 850 650 500 350 10 500 13 300 16 650 20 800 125 450 100 850 900 350 150 900 650 650 12 250 15 300 19 100 150 050 550 200 100 500 100 750 400 050 10 200 12 700 16 000 180 700 150 700 400 750 250 800 350 700 500 10 650 13 300 200 550 950 400 100 350 850 300 800 050 650 550 11 950 230 350 700 100 700 950 350 750 200 250 650 350 10 400 250 250 550 950 450 700 100 450 850 850 150 650 550 300 050 300 600 050 250 550 870 200 050 100 400 000 350/356 875 100 400 750 950 200 450 750 450 400 500 850 400/406 765 960 200 550 700 950 150 400 050 850 800 000 450/457 680 850 100 400 500 700 950 150 700 400 250 350 500/508 615 765 960 250 350 550 750 950 450 100 850 800 600/610 510 640 800 050 150 300 450 600 050 550 200 000 650/660 460 580 720 930 010 160 300 450 820 320 900 620 750/762 410 510 640 820 895 050 150 300 650 050 550 200 800/813 385 480 600 765 840 960 075 200 550 950 400 000 900/914 340 425 535 680 750 850 955 100 350 700 150 700 000/1 015 310 385 480 615 670 765 860 960 250 550 950 400 060/1 067 295 365 455 585 640 730 820 910 150 500 850 300 120 280 350 435 560 610 695 780 870 100 400 750 200 220 255 320 400 510 560 640 720 800 050 300 600 000 250 245 305 380 490 535 610 690 760 960 220 530 910 500 205 255 320 410 450 510 570 640 805 020 270 600 800 170 220 265 340 375 425 475 535 670 850 100 350 1) 50 The values given in the table are not the exact calculated values but recommended values to be used for marking the abrasive products BS EN 12413:2007+A1:2011 EN 12413:2007+A1:2011 (E) Bibliography [1] EN 792-7, Hand-held non-electric power tools — Safety requirements — Part 7: Grinders [2] EN 792-9, Hand-held non-electric power tools — Safety requirements — Part 9: Die grinders [3] EN 13218, Machine tools — Safety — Stationary grinding machines [4] EN 60745-2-3, Hand-held motor-operated electric tools — Safety — Part 2-3: Particular requirements for grinders, polishers and disc-type sanders [5] EN ISO 19432, Building construction machinery and equipment — Portable, hand-held, internal combustion engine driven cut-off machines — Safety requirements and testing (ISO 19432:2006) [6] ISO 3864-2, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product safety labels 51 BS EN 12413:2007 +A1:2011 BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that 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