BSI Standards Publication BS EN 847 3 2013 Tools for woodworking — Safety requirements Part 3 Clamping devices BS EN 847 3 2013 BRITISH STANDARD National foreword This British Standard is the UK imple[.]
BS EN 847-3:2013 BSI Standards Publication Tools for woodworking — Safety requirements Part 3: Clamping devices BS EN 847-3:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 847-3:2013 It supersedes BS EN 847-3:2004 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee MTE/23, Woodworking machines A list of organizations represented on this committee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 © The British Standards Institution 2013 Published by BSI Standards Limited 2013 ISBN 978 580 75763 ICS 79.120.10 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 October 2013 Amendments issued since publication Date Text affected BS EN 847-3:2013 EN 847-3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM October 2013 ICS 79.120.10 Supersedes EN 847-3:2004 English Version Tools for woodworking - Safety requirements - Part 3: Clamping devices Outils pour le travail du bois - Prescriptions de sécurité Partie 3: Outils de serrage Maschinen-Werkzeuge für Holzbearbeitung Sicherheitstechnische Anforderungen - Teil 3: Spannzeuge This European Standard was approved by CEN on 10 August 2013 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 847-3:2013: E BS EN 847-3:2013 EN 847-3:2013 (E) Contents Page Foreword Introduction Scope Normative references Terms and definitions List of significant hazards 5.1 5.2 5.3 5.4 5.5 5.5.1 5.5.2 5.5.3 5.6 Design requirements .7 General Hydrostatic clamping devices with open system .7 Shape Balance Testing Test sample and dimensions Formulae and calculation 10 Test procedure 10 Requirements on tolerances of clamping devices 11 6.1 6.2 6.3 6.4 Marking of clamping devices 11 General 11 Marking of clamping devices for bore mounted tools 11 Marking of clamping devices for shank mounted tools 11 Marking of one piece clamping devices for shank mounted tools 12 7.1 7.2 Information for use 12 General 12 Safe working practice 12 Bibliography 13 BS EN 847-3:2013 EN 847-3:2013 (E) Foreword This document (EN 847-3:2013) has been prepared by Technical Committee CEN/TC 142 “Woodworking machines - Safety”, the secretariat of which is held by UNI 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 April 2014, and conflicting national standards shall be withdrawn at the latest by April 2014 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 This document supersedes EN 847-3:2004 The following table contains a list of modifications from the previous edition EN 847-3:2004 EN 847-3:2013 Reason Terms Terms and definitions: new headline some new definitions ed/te Safety requirements Design requirements: new numbering ed Information for use Information for use; with 7.2 Safe working practice ed Annex A: Safe work practice No Annex A ed New: Bibliography ed According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 847-3:2013 EN 847-3:2013 (E) Introduction This European Standard specifies general requirements for the safety of clamping devices for machine tools for woodworking It is addressed to manufacturers and it is useful for end users BS EN 847-3:2013 EN 847-3:2013 (E) Scope This European Standard specifies all hazards arising from the use of clamping devices for the fastening of milling tools and circular saw blades on woodworking machines and specifies the methods for the elimination or reduction of these hazards by the design of the clamping device and by the provision of information This European Standard does not apply to arbors for spindle moulding machines in accordance with EN 848-1 or to clamping flanges for circular sawing blades to be used on circular sawing machines in accordance with the standard series EN 1870 and does not cover hazard related to the connection of the clamping device with the machine Bore mounted tools which are mounted on an interchangeable arbor should be considered as a shank mounted tool NOTE For definition of "woodworking machines", see EN 847-1 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 847-1:2013, Tools for woodworking — Safety requirements — Part 1: Milling tools, circular saw blades ISO 1940-1, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances ISO 10897, Collets for tool holders with taper ratio 1:10 — Collets, holders, nuts ISO 15488, Collets with degree setting angle for tool shanks — Collets, nuts and fitting dimensions Terms and definitions For the purposes of this document, the terms and definitions given in EN 847-1:2013 and the following apply 3.1 shank part of the tool by which it is held [SOURCE: ISO 3002-1:1982, 3.2.2] 3.2 shank mounted tool tool with a shank 3.3 bore mounted tool tool with a bore for mounting 3.4 tool bore that bore in a tool by which it can be located and fixed by a spindle, arbour or mandrel [SOURCE: ISO 3002-1:1982, 3.2.3] BS EN 847-3:2013 EN 847-3:2013 (E) 3.5 clamping device element for fixing the tool on the driving spindle of the woodworking machine, for transferring the torque of the driving spindle and for positioning of the tool 3.5.1 friction lock clamping device clamping device where the connection between tool and clamping device as well as the positioning of the tool is achieved by friction lock fixing elements (e.g by spring tensions, gripping elements, hydrostatic clamping elements) 3.5.1.1 clamping device with mechanical clamping fixture clamping device where gripping of the tool in the clamping device is performed mechanically, e.g by spring tension, gripping elements 3.5.1.2 clamping device with hydrostatic clamping fixture clamping device where gripping of the tool in the clamping device is performed hydrostatically, e.g by hydrostatic clamping elements 3.5.1.2.1 hydrostatic clamping element element which neutralises tolerances between the woodworking tool and the clamping device by elastic deformation Note to entry: The deformation is generated by hydrostatic pressure 3.5.1.2.2 open system clamping device clamping device where the clamping medium (incompressible fluid, e.g oil, grease) can escape when released and is supplied from the outside when clamped 3.5.1.2.3 close system clamping device clamping device where the clamping medium is permanently and pressure-tightly retained in the system 3.5.1.3 one piece clamping device solid clamping device where the clamping force is generated by the elasticity of its material, e.g shrink chuck 3.5.2 form lock clamping device clamping device where the connection between tool and clamping device is achieved by form lock fixing elements, e.g bayonet type clamping, flatted cylindrical shanks 3.6 maximum rotational speed maximum rotational speed for the operation for which the clamping device is designed List of significant hazards Table shows the list of significant hazards BS EN 847-3:2013 EN 847-3:2013 (E) Table — List of significant hazards Condition or causes of the hazard related to the clamping device Hazard Ejection of parts Vibrations Corresponding clause of EN 847-3 Incorrect assembly of the clamping device 5.6 Modification of tool position relative to the clamping device 7.2 Dynamic unbalance of the clamping device while rotating 5.4 Loosening of the tool in/on the clamping device during machining 7.2 Fastening of the clamping device on the driving spindle 7.2 Dynamic unbalance of the clamping device 5.4 Design requirements 5.1 General Clamping devices shall be designed and made of such materials that they withstand the forces and loads expected during operation Verification: By test procedure described in 5.5.3 NOTE For the calculation of the shank strength, see EN 847-2 In the area of the mounted surface, clamping devices shall be compatible to woodworking tools 5.2 Hydrostatic clamping devices with open system Hydrostatic clamping devices with open system shall be designed to retain the tool in the clamping device in the event of the loss of pressure, e.g by an additional mechanical locking Verification: By checking the relevant drawings and visual inspection of the clamping device 5.3 Shape The cross-section of clamping devices shall have a circular form perpendicular to the axis of rotation The following exceptions of the circular form are permissible: thread holes for fixing, balancing screws and balancing holes; widths across flats; shape and dimensions according to the sizes of the wrenches; balancing flats for systems with flatted tool shanks Verification: By checking the relevant drawings, measurement and visual inspection of the clamping device 5.4 Balance Clamping devices having a mass greater than 0,5 kg shall be balanced BS EN 847-3:2013 EN 847-3:2013 (E) Clamping devices with keyways inside the bore shall be balanced without keys and clamping devices with keyways on the outside diameter shall be balanced with keys Maximum rotational speed –1 in nmax Permissible residual unbalance for clamping devices U T∗ in g ⋅ mm kg The balance quality requirements shown in Table shall be applied Table — Minimum balance quality requirements Number Type of clamping devices Clamping devices in general Clamping devices with movable parts of at least 15 % of the total mass G-value = eper according to ISO 1940-1 6,3 16 Formula (expands ISO 1940-1) U T* = 0,6016 ⋅ 10 ⋅ U T* = 1,5279 ⋅ 10 ⋅ nmax nmax Explanation of the formula The value of 0,601 is the product of e per ⋅ ω ⋅ 10 ⋅ 60 2⋅π The value of 1,527 is the product of e per ⋅ ω ⋅ 10 ⋅ 60 2⋅π Verification: By measurement of the clamping device 5.5 Testing 5.5.1 Test sample and dimensions One-piece sleeves and one-piece arbors shall not be tested Arbors with form lock elements (e.g keys) shall be counted as a single element Test rotational speed: np = 1,5 × nmax Test torsional moment: Mp = 1,5 × Mmax The values (Mmax, nmax, t) and required dimensions shall be determined The test sample for clamping devices for bore mounted tools shall have a cylindrical shape and contain a required mounting bore (e.g bore, hollow taper) The test sample for clamping devices for shank mounted tools consists of a cylindrical part with an appropriate mounting shank (e.g cylindrical shank, hollow taper shank) The tolerances of the test sample shall be in accordance with the tolerances of the clamping device The balance quality of the test sample shall be G40 for complex tools (see EN 847-1) The specific density ρ of the test sample shall be 7,85 kg/dm Test sample dimensions are given in Figure BS EN 847-3:2013 EN 847-3:2013 (E) a) Clamping device with a test sample with shank b) Clamping device with a test sample with bore Key clamping device test piece nmax maximum rotational speed in min− l1 body width of the test piece in mm v peripheral speed in m/s angular acceleration in s− Fp test force in N α ω rp Mp test radius in mm test torsional moment in Nm JB JC angular velocity in s mass inertia moment (share of the bore) in kgm mass inertia moment (share of the test piece without shank) in kgm JS mass inertia moment (share of the shank) in kgm Mp = Fp × rp × 10 np −1 test rotational speed in min− t r2 deceleration time in s shank radius in mm r1 Mmax outside radius in mm maximum torsional moment in Nm lg shank length in mm 2 JT mass inertia moment kgm ρ specific density in kg/dm Figure — Test sample dimensions BS EN 847-3:2013 EN 847-3:2013 (E) 5.5.2 Formulae and calculation For the calculation of the body width of the test piece the following formulae apply: 30 ⋅ t J T = M p ⋅ π ⋅ nmax (1) where JT is: with shank J T = J C + J S (2) with bore J T = J C − J B (3) For test bodies with cylindrical shank: M p ⋅ 60 r t ⋅ ⋅ 10 12 − ⋅ l g l1 = π ⋅ ρ ⋅ n r1 r1 p (4) If the processes of acceleration or deceleration are not constant, the maximum partial acceleration (∆α = ∆v/∆t) shall be considered EXAMPLE 5.5.3 Example of calculation: Test torsional moment Mp = 40,0 Nm Test rotational speed np = 27 000 min− Deceleration time t = 0,5 s Shank radius r2 = 12,5 mm Shank length lg = 50,0 mm Outside radius r1 = 53,0 mm Body width of the test piece l1 = 72,2 mm Specific density ρ = 7,85 kg/dm3 Test procedure The test procedure is the following: a) The test sample shall be mounted in or on the clamping device b) The maximum torsional moment Mmax and the maximum rotational speed nmax shall be determined The minimum clamping length must be specified by the manufacturer of the clamping device c) The mounted test sample shall be constantly accelerated to the maximum rotational speed within 10 s and shall operate for the duration of one minute at the maximum rotational speed After that the test piece shall be constantly decelerated within 10 s d) Check whether Mmax can be transmitted 10 BS EN 847-3:2013 EN 847-3:2013 (E) e) The mounted test sample shall be accelerated within s to 10 s to the test rotational speed according to 5.3.2 and shall operate for the duration of 10 at the test rotational speed f) The test sample shall be decelerated within s to 10 s from the test rotational speed to standstill g) Check whether 0,9 × Mp can be transmitted The test is fulfilled if both d) and g) are satisfied Verification: Measurement of the torsional moment which shall be in accordance with f) NOTE The transmittable rotational moment is determined by this test c) and e), taking only into account alterations depending on the system (e.g seating of elements of the test piece after acceleration and deceleration, changes of the position of system elements) 5.6 Requirements on tolerances of clamping devices The requirements on tolerances of clamping devices shall be determined Verification: By the test described in 5.5.3 for the most unfavourable combination of tolerances 6.1 Marking of clamping devices General Clamping devices shall be clearly and permanently marked Permanently marked means, e.g engraving, etching or embossing stamping A character height of mm, where possible, is considered acceptable for clear marking Verification: By checking the relevant drawing and visual inspection 6.2 Marking of clamping devices for bore mounted tools Clamping devices for bore mounted tools shall be clearly and permanently marked at least with the name or trademark of the manufacturer or supplier; maximum rotational speed, e.g n max 000 6.3 Marking of clamping devices for shank mounted tools Bodies for clamping devices for shank mounted tools shall be clearly and permanently marked at least with the name or trademark of the manufacturer or supplier; maximum rotational speed, e.g n max 18 000 Collet chuck holder shall be clearly and permanently additionally marked with the type of collet in accordance with ISO 10897 and ISO 15488 (e.g 472 E) The part of the clamping devices which fixes the tool shall be clearly and permanently marked with the nominal diameter of the tool shank or, if applicable, the clamping range 11 BS EN 847-3:2013 EN 847-3:2013 (E) 6.4 Marking of one piece clamping devices for shank mounted tools One piece clamping devices for shank mounted tools shall be clearly and permanently marked at least with the name or trademark of the manufacturer or supplier; the required diameter and tolerances of the tool shank Information for use 7.1 General The information for use shall contain all information marked on the clamping devices and, in addition, name and address of the manufacturer or supplier 7.2 Safe working practice The following information of the safe working practice shall be given, if applicable a) Maximum rotational speed b) Compare the speeds indicated on the clamping device and on the tool to be clamped For adjusting the speed on the machine the lower speed shall be applied c) Fastening of clamping devices and tools: 1) Screws and nuts shall be tightened using the appropriate spanners 2) Clamping surfaces shall be cleaned to remove dirt, grease, oil and water 3) Clamping devices and tools shall be mounted or clamped according to given torques, pressures and wrenches to be used 4) Extension of spanners or tightening or loosening by means of hammer blows shall not be permitted 5) Maximum tool diameters and tool lengths shall not be exceeded 6) Shank diameters shall be in accordance with the clamping range of the clamping devices 7) The minimum required clamping length shall be kept d) Use of clamping devices with integrated data medium Care shall be taken that the data relevant to the safety of the clamped tool are always stored in the data medium e) For repair of clamping devices particular attention shall be given to the following: 1) Repairs shall only be carried out by a competent person, i.e a person with professional training and experience, who has knowledge of the design, construction and safety requirements 2) Repair shall therefore include, e.g the use of spare parts which are in compliance with the specifications of the original parts Verification: By checking the information for use 12 BS EN 847-3:2013 EN 847-3:2013 (E) Bibliography [1] EN 847-2, Tools for woodworking — Safety requirements — Part 2: Requirements for the shank of shank mounted milling tools [2] EN 848-1, Safety of woodworking machines — One side moulding machines with rotating tool — Part 1: Single spindle vertical moulding machines [3] EN 1870-3, Safety of woodworking machines — Circular sawing machines — Part 3: Down cutting cross-cut saws and dual purpose down cutting cross-cut saws/circular saw benches [4] EN 1870-4, Safety of woodworking machines — Circular sawing machines — Part 4: Multiblade rip sawing machines with manual loading and/or unloading [5] EN 1870-5, Safety of woodworking machines — Circular sawing machines — Part 5: Circular sawbenches/up-cutting cross-cut sawing machines [6] EN 1870-6, Safety of woodworking machines — Circular sawing machines — Part 6: Circular sawing machines for firewood and dual purpose circular sawing machines for firewood/circular saw benches, with manual loading and/or unloading [7] EN 1870-7, Safety of woodworking machines — Circular sawing machines — Part 7: Single blade log sawing machines with integrated feed table and manual loading and/or unloading [8] EN 1870-8, Safety of woodworking machines — Circular sawing machines — Part 8: Single blade edging circular rip sawing machines with power driven saw unit and manual loading and/or unloading [9] EN 1870-9, Safety of woodworking machines — Circular sawing machines — Part 9: Double blade circular sawing machines for cross-cutting with integrated feed and with manual loading and/or unloading [10] EN 1870-10, Safety of woodworking machines — Circular sawing machines — Part 10: Single blade automatic and semi-automatic up-cutting cross-cut sawing machines [11] EN 1870-11, Safety of woodworking machines — Circular sawing machines — Part 11: Semi-automatic and automatic horizontal cross-cut sawing machines with one saw unit (radial arm saws) [12] EN 1870-13, Safety of woodworking machines — Circular sawing machines — Part 13: Horizontal beam panel sawing machines [13] EN 1870-14, Safety of woodworking machines — Circular sawing machines — Part 14: Vertical panel sawing machines [14] EN 1870-15, Safety of woodworking machines — Circular sawing machines — Part 15: Multi-blade crosscut sawing machines with integrated feed of the workpiece and manual loading and/or unloading [15] EN 1870-16, Safety of woodworking machines — Circular sawing machines — Part 16: Double mitre sawing machines for V cutting [16] EN 1870-17, Safety of woodworking machines — Circular sawing machines — Part 17: Manual horizontal cutting cross-cut sawing machines with one saw unit (radial arm saws) [17] EN 1870-18, Safety of woodworking machines — Circular sawing machines — Part 18: Dimension saws [18] ISO 3002-1:1982, Basic quantities in cutting and grinding — Part 1: Geometry of the active part of cutting tools — General terms, reference systems, tool and working angles, chip breakers 13 This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators and others to shape their 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