BS-EN-ISO-8662-4-1995 ISO-8662-4-1994.pdf

BRITISH STANDARD BS EN ISO 8662-4:1995 ISO 8662-4: 1994 Hand-held portable power tools Measurement of vibrations at the handle Part 4: Grinding machines The European Standard EN ISO 8662-4:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8662-4:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1995 © BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference GME/21 Draft for comment 92/84671 DC ISBN 0 580 24873 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GME/21, Mechanical vibration and shock, upon which the following bodies were represented: Federation of Civil Engineering Contractors Imperial College of Science, Technology and Medicine Institute of Sound and Vibration Research Institution of Mechanical Engineers Lloyds Register of Shipping Ministry of Defence Open University Power Generation Contractors Association (BEAMA Ltd.) Railway Industry Association of Great Britain Society of British Aerospace Companies Limited Society of Environmental Engineers The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Agricultural Engineers Association British Aggregate Construction Materials Industries British Agricultural and Garden Machinery Association Ltd. British Compressed Air Society British Gas plc British Hydraulic Tool Manufacturers Association British Occupational Hygiene Society British Railways Board Department of the Environment (Building Research Establishment) Forestry Commission Health and Safety Executive Institute of Explosives Engineers Institute of Naval Medicine Institution of Electrical Engineers Medical Research Council Portable Electric Tool Manufacturers Association University College of Swansea University of Salford Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8662-4:1995 © BSI 08-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Introduction3 1Scope3 2Normative references3 3Quantities to be measured3 4Instrumentation3 5Measurement direction and measurement location5 6Determination of working procedure6 7Measurement procedure and validity of measurements8 8Test report8 Annex A (informative) Model test report for vibrations at the handle of grinders10 Annex ZA (normative) Normative references to international publications with their relevant European publications12 Annex ZB (informative) Bibliography12 Figure 1 Measurement directions, examples of position of transducers and application of feed force4 Figure 2 Options for fastening of transducers5 Figure 3 Grinder Working position of operator6 Figure 4 Specifications of test wheel and bushing7 Table 1 Dimensions of bushing8 Table 2 Dimensions of artificial test wheels for grinders other than straight grinders9 Table 3 Dimensions of artificial test wheels for straight grinders9 Table 4 Feed force9 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8662-4:1995 ii © BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee GME/21, and is the English language version of EN ISO 8662-4:1995 Hand-held portable power tools Measurement of vibrations at the handle Part 4: Grinders published by the European Committee for Standardization (CEN). It is identical with ISO 8662-4:1994 published by the International Organization for Standardization (ISO). EN 28662-4:1994 was produced as a result of international discussion in which the UK took an active part. Other Parts of ISO 8662 have been implemented in the BS EN 28662 series and the BS EN ISO 8662 series. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred toCorresponding British Standard EN 28662-1:1992 ISO 8662-1:1992 BS EN 28662-1:1993 Hand-held portable power tools Measurement of vibrations at the handle Part 1: General Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 8662-4 April 1995 ICS 13.060; 25.140.10 Descriptors: Tools, hand tools, power-operated tools, portable equipment, portable electronic machine tools, pneumatic equipment, grinding machines (tools), vibration, tests, vibration tests, tool handles English version Hand-held portable power tools Measurement of vibrations at the handle Part 4: Grinders (ISO 8662-4:1994) Machines à moteur portatives Mesurage des vibrations au niveau des poignées Partie 4: Meuleuses (ISO 8662-4:1994) Handgehaltene motorbetriebene Maschinen Messung mechanischer Schwingungen am Handgriff Teil 4: Schleifmaschinen (ISO 8662-4:1994) This European Standard was approved by CEN on 1995-02-15. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 8662-4:1995 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8662-4:1995 © BSI 08-1999 2 Foreword The text of the International Standard ISO 8662-4:1994 has been prepared by Technical Committee ISO/TC 118, Compressors, pneumatic tools and pneumatic machines, in collaboration with CEN/TC 231, Mechanical vibration and shock. It has been submitted to Parallel Vote and has been approved by CEN on 1995-02-15 as a European Standard. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). 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 October 1995, and conflicting national standards shall be withdrawn at the latest by October 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. NOTENormative references to international publications are listed in Annex ZA (normative). Annex ZB (informative) contains the bibliography. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8662-4:1995 © BSI 08-19993 Introduction This part of ISO 8662, which specifies a type test for the measurement of vibrations at the handles of hand-held portable grinders, supplements ISO 8662-1 which gives general specifications for the measurement of vibrations at the handles of hand-held portable power tools. It specifies the operation of the tool under type test and other requirements for the performance of the type test. The principle of the operation of these power tools is that a driving medium causes an output spindle to rotate. The spindle is adapted to carry an abrasive device for material removal. It has been found that vibrations generated by a grinder cutting or grinding a workpiece vary considerably. The variation is largely due to the variances in the unbalance of the machine with the grinding wheel mounted. The unblance also changes when the wheel is in operation. In order to provide a method which gives good measurement reproducibility, the procedure adopted in this part of ISO 8662 uses a test wheel of known unbalance mounted on a machine and running free. The unbalance is chosen to be 40 % of the highest permissible unbalance according to ISO 6103. Preliminary investigations suggest that the values obtained when the machine is running free are usually correlated with measurements obtained when grinding. However, the procedures of ISO 5349 are required whenever exposure at the workplace is to be assessed. 1 Scope This part of ISO 8662 specifies a laboratory method for measuring the vibrations at the handles of hand-held power-driven grinders. It is a type-test procedure for establishing the magnitude of vibration in the handle of a power tool fitted with a specified test wheel. The power tools covered by this part of ISO 8662 may be pneumatically driven, or driven by other means. Typical tools are illustrated in Figure 1. This part of ISO 8662 does not apply to die grinders. It is intended that the results be used to compare different models of the same type of power tool, i.e. power tools intended for use with the same grinding wheel (same diameter and same maximum peripheral speed). If an evaluation of vibration exposure is required, then measurements in a work situation will be required. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 8662. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 8662 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 8662-1:1988, Hand-held portable power tools Measurement of vibrations at the handle Part 1: General. European Standard EN 792-7, Handheld non-electric power tools Safety requirements Part 7: Grinders. 3 Quantities to be measured The quantities to be measured are as follows: a) the root-mean-square (r.m.s.) acceleration in accordance with ISO 8662-1:1988, 3.1, presented as a weighted acceleration in accordance with ISO 8662-1:1988, 3.3; b) the rotational speed; c) the downward feed force. 4 Instrumentation 4.1 General The specifications for the instrumentation given in ISO 8662-1:1988, 4.1 to 4.6, apply. 4.2 Transducer The specification for the transducer given in ISO 8662-1:1988, 4.1, applies. 4.3 Mechanical filter It is not normally necessary to use a mechanical filter for measurements according to this part of ISO 8662 (see ISO 8662-1:1988, 3.2). 4.4 Fastening of transducer Fastening of the transducer shall be in accordance with ISO 8662-1:1988, 4.2. Small transducers may be glued to a flat surface using a suitable adhesive. In all cases, the fastening of the transducer shall be in accordance with the transducer manufacturers instructions (see Figure 2). If the handle has a soft resilient cover, a clamp shall be tightened securely around it on which the transducer is mounted, or a special adaptor may be used. If the tool has a resilient handle, the test report shall state the action taken, e.g. solid clamping, or use of adaptor. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8662-4:1995 4 © BSI 08-1999 Figure 1 Measurement directions, examples of position of transducers and application of feed force Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:00:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8662-4:1995 © BSI 08-19995 4.5 Auxiliary equipment The air pressure shall be measured using manometer. The rotational speed shall be measured using a tachometer with an accuracy of at least 1 %. 4.6 Calibration Calibration shall be carried out in accordance with ISO 8662-1:1988, 4.8. 5 Measurement direction and measurement location 5.1 Measurement direction Measurements shall be made on both handles in the z-direction (see Figure 1). For straight grinders the z-direction is perpendicular to the axis of rotation. For vertical and angle grinders the z-direction is parallel to the axis of rotation. 5.2 Measurement location Handles may be attached to machines either rigidly or, in order to provide some vibration insulation, using an elastic mounting. For rigidly mounted handles (where the centre of motion is inside the machine housing), vibration measurement can be carried out using one transducer attached preferably on the underside of the handle at a point in the middle of the grip surface. This point shall be 60 mm from the end of the grip (see Figure 1). Handles designed as antivibration devices may be elastically mounted on the machine. In such cases machine and handle may vibrate out of phase, resulting in a motion which cannot be adequately measured using a single transducer. For such handles measurements shall be made using two transducers mounted symmetrically approximately 100 mm apart about the centre point described above. The transducers shall be mounted perpendicularly to the surface of the handle even if the surface is not exactly perpendicular to the ideal axis. Deviations of ± 15° from this theoretical axis are acceptable. If the deviation is greater than ± 15°, an appropriate block should be used. This part of ISO 8662 specifies the position of measurement on the handle, although it is accepted that higher values of vibration may be found at other positions. For type testing it is important