EN 13743:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Varnostne zahteve za brusilna sredstvaSicherheitsanforderungen für Schleifmittel auf UnterlagenPrescriptions de sécurité pour les produits abrasifs appliquésSafety requirements for coated abrasives25.100.70BrusivaAbrasivesICS:Ta slovenski standard je istoveten z:EN 13743:2001SIST EN 13743:2004en01-september-2004SIST EN 13743:2004SLOVENSKI
STANDARD



SIST EN 13743:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13743December 2001ICS 25.080.50; 25.100.70English versionSafety requirements for coated abrasivesPrescriptions de sécurité pour les produits abrasifsappliquésSicherheitsanforderungen für Schleifmittel auf UnterlagenThis European Standard was approved by CEN on 26 October 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13743:2001 ESIST EN 13743:2004



EN 13743:2001 (E)2ContentspageForeword.3Introduction.31 Scope.32 Normative references.33 Terms, definitions and symbols.44 List of hazards.75 Requirements.75.1 Maximum operating speeds.75.2 Safety factors.75.3 Maximum operating speeds, dimensions and dimensional limitations.85.4 Requirements for back-up pads for vulcanised fibre discs.105.5 Marking.106 Inspection and testing by the manufacturer.106.1 Test methods.106.2 Scope of the inspection.127 Information for use.12Annex A
(normative)
Marking.14A.1 Purpose.14A.2 Content of marking.14A.3 Execution of marking.17Annex B
(informative)
Conversion table for speeds of rotation and peripheral speeds as a function ofoutside diameter D of the abrasive products.18SIST EN 13743:2004



EN 13743:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 143 "Machine tools — Safety" thesecretariat 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 orby endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn at the latest byJune 2002.Annex A is normative, and annex B is informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.IntroductionThis standard is addressed to designers, manufacturers, and suppliers of the abrasive products described in thescope. It also provides a means of supporting designers, manufacturers, and suppliers of grinding machines in theselection of abrasive products under the aspect of risk reduction and achievement of compliance of thecorresponding machines with the essential safety requirements of the Machinery Directive.The extent to which hazards are covered is indicated in the scope of this standard.1ScopeThis European Standard applies to the following coated abrasive products: flap wheels, flap discs, vulcanised fibrediscs and spindle mounted flap wheels. It also applies to back-up pads for vulcanised fibre discs. It specifiesrequirements and/or measures for removal or reduction of hazards related to the design and application of theabrasive products and clamping devices.This standard covers also methods and tests for the assessment of conformity with the requirements as well asinformation for use which the manufacturer shall make available to the user.The hazards taken into account are indicated in clause 4 of this standard.The standard does not apply to non-woven web abrasive products.2Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).ISO 554, Standard atmospheres for conditioning and/or testing — Specifications.SIST EN 13743:2004



EN 13743:2001 (E)43Terms, definitions and symbolsFor the purposes of this European Standard the following terms, definitions and symbols apply.3.1coated abrasivesabrasive products composed of backing, abrasive, and bond3.2clamping devicesdevices for fixing and positioning the abrasive product on the spindle of the grinding machine including e.g. back-uppads for vulcanised fibre discs, and chucking flanges for flap wheels3.3Grinding machines3.3.1stationary grinding machinesmachines fixed to their position during operation due to their nature or their mechanical attachment. They alsoinclude e.g. stationary swing-frame grinding machines and mobile machines maintained in position during operationby claming elements3.3.2mobile grinding machinesmachines guided manually (but not hand-held) during grinding, e.g. floor grinding machines3.3.3hand-held grinding machinesmachines, including those with flexible shaft, held in the hand during the grinding process3.4Type of applicationSee Table 1.3.4.1mechanically guided grindingfeed movements of the abrasive product and/or workpiece are guided by mechanical means3.4.2manually guided grindingfeed movements of the abrasive product and/or the workpiece are manually guided by the operator3.4.3hand-held grindinggrinding machine is entirely guided by the operators handsSIST EN 13743:2004



EN 13743:2001 (E)5Table 1 — Type of applicationType of machineType of applicationAbrasive productWorkpieceFixedGuided mechanicallyStationary grindingmachinesMechanically guidedgrindingGuided mechanicallyFixedGuided mechanicallyGuided mechanicallyStationary and mobilegrinding machinesManually guided grindingGuided by handFixedFixedGuided by handHand-held grindingmachinesHand-held grindingGuided by handFixed3.5Dimensional abbreviationsTable 2 — Dimensional abbreviationsSymbolDesignationDOutside diameter of abrasive productsD1Diameter of support of flap wheels with fixed flange and of ring groove of flap wheelswith loose flangeHAbrasive product bore diameterlsLength of cross slots of vulcanised fibre discsL2Length of spindle of spindle mounted flap wheelsSdDiameter of spindle of spindle mounted flap wheelsTThickness of abrasive productsSIST EN 13743:2004



EN 13743:2001 (E)63.6Symbols for speeds of rotation, operating speeds and safety factorsTable 3 — Speed and testingSymbolDesignationDefinitionUnitnSpeed of rotationRevolutions per minute (rpm)min- 1 ormin1nabDeflection speed ofmounted wheelsSpeed or rotation at which the spindle ofmounted wheels is deflecting undercentrifugal stressmin- 1 ormin1nmaxMaximum permissiblespeed of rotationRevolutions per minute (rpm) of the newabrasive product at maximum operatingspeedmin- 1 ormin1vPeripheral surfacespeedSpeed at the periphery of the abrasiveproductm/svsMaximum operatingspeedThe maximum permissible peripheralspeed of a rotating abrasive productm/svprSafety test speedPeripheral speed at which abrasiveproducts are tested by the manufacturerm/sfprTest speed factorThe ratio of the safety test speed dividedby the maximum operating speed—vbrBursting speedThe peripheral surface speed at whichthe abrasive product breaks due tocentrifugal forcem/svbr minMinimum burstingspeedPeripheral speed which the abrasiveproduct shall at least reach withoutbursting due to centrifugal forcem/sSSafety factor againstbursting due tocentrifugal forceThe bursting speed, divided by themaximum operating speed, all squared.The formula for S is:2sbr÷÷øöççèæ=vvS—SabSafety factor againstdeflection of thespindle of spindlemounted flap wheelsThe deflection speed divided by theadmissible speed of rotation.The formula is:maxababnnS=—3.7Other definitions3.7.1labelscarrier of information linked or added to the abrasive product containing essential safety information on the abrasiveproductSIST EN 13743:2004



EN 13743:2001 (E)74List of hazardsTable 4 — List of hazardsDesignation of hazardHazardous situations(Examples)Relevant clauses in thestandardEjection of parts1.Abrasive product breakagecaused by:—Improper design of abrasiveproduct5.1, 5.2, 5.3, 5.4—Manufacturing defects6—Wrong selection of abrasiveproducts5.5, 7, annex A—Improper handling andstorage7—Improper use(mounting and grinding process)72.Loosening of grinding particles duringgrinding75Requirements5.1Maximum operating speedsAbrasive products shall be manufactured for maximum operating speeds classified in the following way: 16 — 16 — 20 — 25 — 32 — 35 — 40 — 45 — 50 — 63 — 80 in m/sConversion table for speeds of rotation and peripheral speeds as a function of outside diameter D of the abrasiveproducts, see annex B.5.2Safety factorsAbrasive products are subjected to high stresses during grinding. Therefore they shall fulfil specified safety factorsand bursting speeds at their maximum operating speed.5.2.1Safety factors for flap wheels, flap discs and vulcanised fibre discsFlap wheels, flap discs and vulcanised fibre discs shall fulfil safety factors and bursting speeds as a function of typeof machine, type of application and maximum operating speed according to Table 5.SIST EN 13743:2004



EN 13743:2001 (E)8Table 5 — Maximum operating speeds, safety factors and minimum bursting speedsfor flap wheels, flap discs and vulcanised fibre discsType of machineType of applicationMaximumoperating speedvsSafety factorSMinimumbursting speedvbr minin m/sin m/s 163—163
28203
35Stationary andMechanically253
43mobileand manually323
55grinding machinesguided grinding353
61403
69453
78503
87633109163
28203
35253
43323
55Hand-held grindingHand-held grinding353
61machines403
69453
78503
87633,5118803,51505.2.2Safety factors for spindle mounted flap wheelsSpindle mounted flap wheels shall fulfil a safety factor against bursting due to centrifugal force of S = 3 at theirmaximum operating speed. The safety factor against deflection of the spindle shall be Sab = 1,3.5.3Maximum operating speeds, dimensions and dimensional limitationsWith respect to shape, type of machine and type of application, the abrasive products shall comply with thedimensions and dimensional limitations as specified i
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