Bsi bs en 00792 9 2001 + a1 2008

BRITISH STANDARD

BS EN
792-9:2001
+A1:2008
Incorporating
corrigendum
February 2007

Hand-held non-electric
power tools — Safety
requirements —
Part 9: Die grinders

ICS 25.140.01

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BS EN 792-9:2001+A1:2008

National foreword
This British Standard is the UK implementation of EN 792-9:2001+A1:2008.
It supersedes BS EN 792-9:2001 which is withdrawn.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 by Technical Committee

MCE/8, Compressors, pneumatic tools, pneumatic machines and vacuum
technology to Panel MCE/8/-/2, Hand-held, non electric power tools - Safety.
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 Committee
and comes into effect on
15 March 2001

Amendments/ corrigenda issued since publication
Amd. No.

Date

16910

28 February 2007 Revision of supersession details.

Corrigendum No. 1

31 May 2009
© BSI 2009

ISBN 978 0 580 61938 0

Comments

Implementation of CEN amendment A1:2008


EUROPEAN STANDARD

EN 792-9:2001+A1

NORME EUROPÉENNE
EUROPÄISCHE NORM

September 2008

ICS 25.140.10; 25.140.99

Supersedes EN 792-9:2001

English Version

Hand-held non-electric power tools - Safety requirements - Part
9: Die grinders
Machines portatives à moteur non électrique - Prescriptions
de sécurité - Partie 9: Meuleuses d'outillage

Handgehaltene nicht-elektrisch betriebene Maschinen Sicherheitsanforderungen - Teil 9: Schleifmaschinen für
Schleifstifte

This European Standard was approved by CEN on 1 December 2000 and includes Amendment 1 approved by CEN on 26 July 2008.

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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: rue de Stassart, 36

© 2008 CEN

All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 792-9:2001+A1:2008: E


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

Contents

Page

Foreword..............................................................................................................................................................3
Introduction .........................................................................................................................................................4
1

Scope ......................................................................................................................................................5

2

Normative references ............................................................................................................................5

3
3.1
3.2

Terms and definitions ...........................................................................................................................6
General terms and definitions ..............................................................................................................6
Terms and definitions related to die grinders ....................................................................................7

4

List of hazards........................................................................................................................................8

5
5.1
5.2
5.3
5.4

5.5
5.6
5.7

Safety requirements and measures .....................................................................................................9
Mechanical safety ..................................................................................................................................9
Thermal safety........................................................................................................................................9
Noise .......................................................................................................................................................9
Vibration ...............................................................................................................................................10
Materials and substances processed, used or exhausted ..............................................................10
Ergonomics ..........................................................................................................................................11
Safety related measures and means..................................................................................................11

6
6.1
6.2

Information for use ..............................................................................................................................12
Marking, signs and written warnings.................................................................................................12
Instruction for use ...............................................................................................................................12

7
Verification ...........................................................................................................................................15
7.1
Noise .....................................................................................................................................................15
7.2
Vibration ...............................................................................................................................................15
7.3
Unintentional start ...............................................................................................................................15
7.4

Structure of verification ......................................................................................................................16
Safety requirement ...........................................................................................................................................16
Annex A (informative) Examples of die grinders covered by this part of EN 792 ......................................17
Annex B (informative) Symbols for labels and signs ....................................................................................18
Annex C (informative) Examples of abrasive products used with die grinders .........................................19
Annex ZA (informative) !Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC".......................................................................................20
Annex ZB (informative) !Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC"...................................................................................21
Bibliography ......................................................................................................................................................22

2


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

Foreword
This document (EN 792-1:2000+A1:2008) has been prepared by Technical Committee CEN/TC 255 ”Handheld, non-electric power tools - Safety", the secretariat of which is held by SIS.
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 March 2009, and conflicting national standards shall be withdrawn at
the latest by December 2009.
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 EU Directive(s).
!For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this
document."
This document includes Amendment 1, approved by CEN on 2008-07-26.
This document supersedes EN 792-9:2001.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
The "European Committee of Manufacturers of Compressors, Vacuum Pumps and Pneumatic Tools",

PNEUROP, has given substantial contributions to this standard.
The standard has been created in close co-operation with CENELEC/TC 61F with the aim of achieving
requirements for mechanical safety in the EN 50144 series, which are similar for hand-held electric and nonelectric power tools.
NOTE
Other technical committees in CEN dealing with hand-held power tools have been asked to follow the safety
requirements as in EN 792.

The annexes to this part of the standard are:
Annex A (informative) Examples of power tools covered by this part
Annex B (informative) Labels, signs and tags
Annex C (informative) Examples of abrasive products used with die grinders
!Annexes ZA and ZB" (informative) Relationship of this European Standard with EU Directives.
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, 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.

3


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

Introduction
This European standard is a type C standard as stated in EN 1070:1998.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this standard.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of other standards, for machines that

have been designed and built according to the provisions of this type C standard.
EN 792 consists of a number of independent parts for individual types of hand-held non-electric power tools.
Other european standards deal with safety rules for hand-held power tools used in e. g. the following fields:


agriculture and forestry such as chain saws, hedge-trimmers, brush cutters, grass trimmers;



construction and building such as cutting-off power tools, concrete vibrators;



food industry, such as fowl secateurs, sheep shears.

Endeavours have been made to achieve co-ordination with the relevant Technical Committees so that the
safety requirements are compatible.
This standard is divided in the following parts:
Part 1: Assembly power tools for non-threaded mechanical fasteners (former part 14)
Part 2: Cutting-off and crimping power tools (former part 15)
Part 3: Drills and tappers
Part 4: Non rotary percussive power tools
Part 5: Rotary, percussive power drills
Part 6: Assembly power tools for threaded fasteners
Part 7: Grinders
Part 8: Sanders and polishers
Part 9: Die grinders
Part 10: Compression power tools
Part 11: Nibblers and shears
Part 12: Small circular, small oscillating and reciprocating saws

Part 13: Fastener driving tools
Certain parts of EN 792 cover hand-held non-electric power tools, driven by internal combustion engines
powered by gaseous or liquid fuel. In these parts, the safety aspects relating to internal combustion engines
are found in a normative annex.
The parts are type C standards and refer to pertinent European Standards of type A and B where such
standards are applicable.

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

1

Scope

EN 792 applies to hand-held non-electric power tools driven by rotary or linear motors, powered by
compressed air, hydraulic fluid and intended to be used by one operator and supported by:


the operator's hand or hands;



a suspension, e. g. a balancer.

This part of EN 792 applies to hand-held, non-electric power tools fitted with collets and used for grinding and
surface finishing and chamfering using mounted points, burrs and files and small wire brushes mounted on
shafts. This part lists the significant hazards caused by such power tools and specifies safety requirements

valid for different aspects of safety during their foreseeable lifetime.
NOTE

Grinders without collets for use with cones and plugs with threaded inserts are covered by EN 792-7.

Power tools covered by this part of the standard:


angle die grinders;



reciprocating files;



rotary files;



straight die grinders.

Special requirements and modifications on a hand-held power tool for the purpose of mounting it in a fixture
are not covered by this part.
NOTE

2

At the date of publication no die grinders driven by internal combustion engines are known.

Normative references

This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to
this European Standard only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to, applies (including amendments).
EN 292-1:1991, Safety of machinery - Basic concepts, general principles for design – Part 1: Basic
terminology, methodology
EN 292-2:1991, Safety of machinery - Basic concepts, general principles for design – Part 2: Technical
principles and specifications
EN 563, Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to establish
temperature limit values for hot surfaces
EN 614-1, Safety of machinery - Ergonomic design principles – Part 1: Terminology and general principles
EN 1070:1998, Safety of machinery - Terminology
EN 1127-1, Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and
methodology
EN 12096, Mechanical vibration - Declaration and verification of vibration emission values

5


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

EN ISO 4871, Acoustics - Declaration and verification of noise emission values of machinery and equipment
(ISO 4871:1996)
EN ISO 8662-13, Hand-held portable power tools - Measurement of vibration at the handle – Part 13: Die
grinders (ISO 8662-13:1997)
EN ISO 14163, Acoustics – Guidelines for noise control by silencers (ISO 14163:1998)

!EN ISO 15744:2008, Hand-held non-electric power tools – Noise measurement code – Engineering
method (grade 2) (ISO 15744:2002)"
EN 28662-1, Hand-held portable power tools - Measurement of vibration at the handle – Part 1: General (ISO
8662-1:1988)
ISO 3857-3:1989, Compressors, Pneumatic tools and machines, Vocabulary – Part 3: Pneumatic tools and
machines.
ISO 5391:1988, Pneumatic tools and machines – Vocabulary

3

Terms and definitions

For the purposes of this part of the standard, the following terms and definitions apply.

3.1

General terms and definitions

3.1.1
hand-held power tool
machine driven by rotary or linear motors powered by compressed air, hydraulic fluid, gaseous or liquid fuel,
electricity or stored energy (e.g. by a spring) to do mechanical work and so designed that the motor and the
mechanism form an assembly that can easily be brought to its place of operation. The hand-held power tool is
operated by one or two hands.
NOTE

Hand-held power tools driven by compressed air or gas are called pneumatic tools.

Hand-held power tools driven by hydraulic liquid are called hydraulic tools.
3.1.2

rotary power tool
hand-held power tool, the machine spindle of which rotates
3.1.3
inserted tool
tool inserted in the hand-held power tool to perform the intended work
3.1.4
service tool
tool intended for performing maintenance or service on the hand-held power tool
3.1.5
control device
device to start and stop the hand-held power tool or to change the direction of the rotation or to control the
functional characteristics such as speed and power
3.1.6
maximum operating pressure
maximum pressure that a hand-held power tool may be operated at, as specified by the manufacturer

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

3.2

Terms and definitions related to die grinders

3.2.1
die grinder
rotary power tool intended for chamfering, deburring, and light cleaning operations and fitted with inserted
tools mounted in collet chucks

NOTE

A die grinder with a burr is often called a rotary file.

3.2.2
collet chuck
device for attaching the inserted tool by clamping the shank
3.2.3
machine spindle
rotating part of a die grinder, driving the collet chuck and consequently the inserted tool
3.2.4
rated speed, r/min
maximum rotational speed of the machine spindle, in revolutions per minute under operating conditions with
the inserted tool mounted and at the upper limit of the energy supply, e.g. pressure or flow, as specified by the
manufacturer
3.2.5
maximum operating speed
maximum peripheral speed of an abrasive product, given in m/s, as specified by the manufacturer of the
abrasive product
3.2.6
reciprocating file
power tool with a rotary or reciprocating motor driving a file in a reciprocating motion.
For other terms, see EN 1070:1998 and also ISO 3857-3:1989 and ISO 5391:1988.
For examples of die grinders see annex A.

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

4

List of hazards

The following hazards can occur in the use of die grinders.
Hazard type

4.1 Mechanical hazards
- cutting
- drawing in or trapping (caused by hair, clothing etc.
getting entangled in a rotating power tool)
- friction or abrasion hazard
- loss of stability
- whipping hose
- ejection from high pressure hydraulic systems
- ejection of parts
- hose and hose coupling specifications
4.2 Electrical hazards
4.3 Thermal hazards
- explosions
- health damage due to hot or cold surfaces
4.4 Hazards caused by noise
4.5 Hazards generated by vibration
4.6 Hazards generated by materials and substances
processed, used or exhausted
- inhalation of harmful dust
- formation of explosive dust
- sparks
- exhaust air

- lubricants
- hydraulic fluid
4.7 Hazards caused by neglecting ergonomic principles in
machine design
- repetitive strain injuries
- unsuitable postures
- inadequate grip design and tool balance
- neglected use of personal protection equipment
4.8 Hazards caused by failure of energy supply
- unexpected return of energy supply after a breakdown
- incorrect hydraulic fluid flow and outlet pressure
4.9 Hazards caused by missing and/or incorrectly
positioned safety related means
- start and stop device
- unintentional start

8

Reference to safety requirement
By design or
Information
guarding
for use
5.1.1
6.2.2
5.1.1
5.1.2
6.2.2
5.1.4
5.1.5

6.2.2
6.2.2
5.2
5.2
5.3
5.4

6.2.2
6.2.2
6.2.2

5.5.2
6.2.2
6.2.2
5.5.1
5.5.3

6.2.2

5.6.1, 5.6.3, 5.6.4,
6.2.2
5.6.1
6.2.2

6.2.2
6.2.2

5.7.1
5.7.2

6.2.2


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

5

Safety requirements and measures

5.1

Mechanical safety

5.1.1

Surfaces, edges and corners

Accessible parts of die grinders, except the insert tool, shall not have sharp edges or angles or rough or
abrasive surfaces, see 3.1 of EN 292-2:1991.
5.1.2

Supporting surface and stability

Die grinders shall be so designed that they can be laid aside and remain in stable position on a plane surface.
5.1.3

Run-down time

The run-down time, after the stop command has been given, shall be as short as possible.

5.1.4

High pressure ejection

Hydraulic systems of the die grinder shall be enclosed so as to give protection against high pressure fluid
ejection.
5.1.5

Speed control

The rated speed of the die grinder shall not be exceeded under the conditions marked on the power tool. It
shall be possible to measure rotational speed by a tachometer.
At no load, the speed may exceed the rated speed by not more than 10% at rated input values.
5.1.6

Guards

Guards covering the inserted tool are not required.

5.2

Thermal safety

Surface temperatures of parts of the power tool which are held during use or could be inadvertently touched
shall follow the provisions of EN 563.
NOTE

The limit values for low temperatures are studied by CEN/TC 122.

Power tools for use in potentially explosive atmospheres should comply with EN 1127-1. However because

the suitability of a power tool for use in potentially explosive atmospheres will depend not only on the power
tool but the inserted tool and the work piece, it is not possible to give any detailed advice in this standard.

5.3

Noise

5.3.1

General

The emission of noise from a hand-held power tool shall be kept as low as possible.
The noise emission from using hand-held power tools emanates from three main sources:


the hand-held power tool itself;



the inserted tool;

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)



the work piece.

NOTE

5.3.2

Generally, the manufacturer has no possibility of the noise emitted by the processed work piece.

Noise emitted by the hand-held power tool

The noise emitted by the hand-held power tool itself can be divided into:


noise from the motor;



noise from exhaust air at pneumatic tools;



vibration induced noise.

The noise from the exhaust of air is one major contributor of noise from pneumatic driven hand-held power
tools. A silencer conforming to EN ISO 14163 of good design will reduce this noise.
The principles contained in EN ISO 11688-1 and EN ISO 11688-2 should be followed to reduce the noise
emitted by the power tool.
NOTE
The exhaust air can also be piped away in a hose away from the operator, however this method has
limitations in practice.

To control the airborne noise emission caused by the radiation of structure borne noise, vibration insulation
and additional damping close to the source can be applied.
The criterion for assessing the efficiency of noise reduction measures are the actual noise emission values
from the machine in relation to other machines of the same family and not the nature of the reduction
measures themselves.

5.4

Vibration

Vibration at the handle of a hand-held power tool shall be kept as low as possible.
The principles contained in CR 1030-1 should be followed to reduce the vibration emitted by the power tool.

5.5
5.5.1

Materials and substances processed, used or exhausted
Exhaust air

For die grinders driven with compressed air the exhaust air shall be directed in such a way that it cannot
cause a hazard to the operator and so that any secondary effects are minimized. e.g. blowing the dust and
reflected air from the workpiece onto the operator.
5.5.2

Dust

It shall be possible to connect to die grinders a dust collecting device or to use a dust suppression device.
NOTE
Because the risks arising from dust will depend on the materials being processed it is not possible to give
technical requirements for collection and disposal of the dust in this standard.

5.5.3

Lubricants

Lubricants for die grinders, specified by the manufacturer, shall not cause hazards to the operator or the
environment.

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

5.6
5.6.1

Ergonomics
Design of the handle

Handles and other parts used for gripping the die grinder shall be designed to ensure that the operator is able
to grip the die grinder correctly and to perform the expected work. Handles shall suit the functional anatomy of
the hand and the dimensions of the hands of the operator population. See 3.6 of EN 292-2:1991 and
EN 614-1.
Power tools having a mass greater than 2 kg (including the inserted tool) shall be capable of being supported
by two hands whilst being lifted or operated.
5.6.2

Control device

The control device shall be adapted to the handle or to the part of the power tool being gripped by the
operator so that it can be held comfortably in the run position.
Die grinders are normally used in operations of long duration therefore the force to keep the start device in the
run position shall be small.
For further information on trigger forces for control devices see EN 894-3.
5.6.3

Suspension device

Provision shall be made, where appropriate, to enable the attachment to the power tool of a suspension
device. The fitting of a suspension device shall not introduce an additional hazard.

5.7
5.7.1

Safety related measures and means
Start and stop device

Die grinders shall be equipped with a single control device to start or stop them. It shall be arranged near the
handle so that the operator can activate it without releasing the grip on the handles.
The start and stop device shall be so designed that the inserted tool ceases to be powered when the start and
stop device is released. Without manual effort it shall, when released, move to the stop position, i.e. be of the
type "hold to run".
The start and stop device shall be in the stop position or immediately move to the stop position when the die
grinder is connected to the energy supply.
It shall not be possible to lock the start and stop device in the running position.
For die grinders with an output power 300 W or less the start and stop device may be designed to be locked in
the on-position, if it can easily be unlocked.
For die grinders with maximum collect capacity of diameter 3,0 mm foot-activation is permitted and they do not
need to have a hold-to-run start and stop device.

5.7.2

Unintentional start

For die grinders with an output power greater than 750 W, the start and stop device shall be so designed that
it requires two separate and dissimilar actions to start the power tool.
The start and stop device shall be so designed, positioned or guarded that the risk of unintentional start is
minimized. Verification shall be made according to clause 7.3.

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BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

6

Information for use

6.1

Marking, signs and written warnings

!Die grinders shall be marked visibly, legibly and indelibly with the following minimum particulars:


the business name and full address of the manufacturer and, where applicable, his authorized
representative;



designation of the machinery;



the CE Marking (see Annex III);



designation of series or type;



serial number, if any;



the year of construction, that is the year in which the manufacturing process is completed."

Die grinders shall be permanently marked with a graphical symbol, stating that the operator's instruction shall
be read before work starts, according to annex B. The direction of rotation shall be permanently marked on
the die grinders according to annex B.
Other graphical symbols that can be used are shown in annex B.

6.2

Instruction for use

6.2.1

General

The instructions for use shall be drawn up by the manufacturer and contain:


operator's instruction;



maintenance instruction.

The operator's instructions shall be drawn up according to 5.5.2, A.1.7.4 and A.2.2 of EN 292 2:1991.
Concerning residual risks see 5.5 of EN 292-1:1991.
6.2.2

Operator's instruction

The operator's instruction shall include a description of the correct use of the die grinder and make reference
to the appropriate inserted tools.
The operator's instruction shall state that any other use is forbidden.
Foreseeable misuse of the power tool, which experience has shown to occur, shall be warned against.
!The operator's instruction shall give information on airborne noise emissions:


the A-weighted emission sound pressure level at workstations, where this exceeds 70 dB (A); where this
level does not exceed 70 dB (A), this fact shall be indicated;



the peak C-weighted instantaneous sound pressure value at workstations, where this value exceeds

63 Pa (130 dB in relation to 20 µPa);

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EN 792-9:2001+A1:2008 (E)



the A-weighted sound power level emitted by the machinery, where the A-weighted emission sound
pressure level at workstations exceeds 80 dB(A)."

!The operator's instruction shall give information on vibration total value in the handles, including
uncertainty of measurement."
The reference numbers of the applied standard for vibration measurements shall be given.
The operator's instruction shall recommend the use of ear protectors.
Warnings shall be given:


that only permitted insert tools of the correct shaft diameter are used;



that cutting-off wheels and routing cutter wheels shall not be used;



that allowed speed of the insert tool is higher than the speed of the die grinder;



that attention must be paid to the fact that allowed speed of the mounted point must be lowered due to
the increase of the length of the shaft between the end of the collet and the mounted point (overhang).
Make sure that the minimum gripping length of 10 mm is observed. See Figure 1 and recommendations
of the manufacturer of mounted points;

Key
D

diameter of
monted point

S

diameter of shank

Lg

gripping length

T

length of
mounted point

Lo

overhang

1

collet holder

2

collet nut

3

collet

4

mounted point

Figure 1 — Gripping length of collet and chucks


that working in certain materials creates emission of dust and fumes, causing a potentially explosive
environment;



of the risk of mismatching the diameter of the shaft of mounted point and that of the collet;

13


BS EN 792-9:2001+A1:2008

EN 792-9:2001+A1:2008 (E)



regarding excessive vibration levels due to improper mounting or damaged insert tool;



that attention shall be paid so that maximum permissible pressure is not exceeded. Preferably a pressure
regulator can be used to control the pressure of the air being supplied to the power tool;



that there is a running on of the rotary inserted tool after the start and stop device has been released.

NOTE

For turbine die grinders the stopping time can be of the order of several seconds.



of the risk of drawing in of long hair, loose clothing;



of the risk that stored gas or fluid energy may cause;



of the risk of a whipping compressed air hose.

Instructions shall be given:


that personal protective safety glasses shall be used, gloves and protective clothing are recommended;



that personal protection and provision for dust collection or suppression shall be appropriate to the
material being worked upon;



that die grinders are not generally insulated for coming into contact with electric power sources;



that die grinders shall not be used in explosive atmospheres unless specially designed for that purpose;



that power tools shall be isolated from the energy source before changing an inserted tool;



that stored gas or fluid energy may cause a hazard;



that only lubricants recommended by the manufacturer shall be used;



that only hydraulic fluids according to the manufacturer's specification shall be used;

NOTE



It is recommended to check with the manufacturer if non-flammable fluids can be used.

that the start and stop device shall be released in case of a energy failure;

Information shall be given for hydraulic die grinders regarding the design and dimension of couplings:


specification of the coupling



specification of hoses with regard to pressure and flow



maximum inlet pressure



maximum flow



maximum inlet temperature of the inlet fluid.

6.2.3

Maintenance instruction

The maintenance instruction shall contain:


14

instruction to keep the power tool safe by regular maintenance;


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)



information on when the regular maintenance shall be carried out; for instance after a specified time of
operation, a specified number of cycles/operations, a stated number of times per year;



a list of the service operations that the user should carry out;



instructions for lubrication if required;



instructions to check the speed and make a simple check of the vibration level after each service;



instructions to take special care when assembling the speed governor or any other protective device;



instructions to check the speed regularly;



instructions for disposal not imposing hazards to personnel and the environment;

!


the specifications of the spare parts to be used, when these affect the health and safety of operators."

7

Verification

7.1

Noise

Compliance with the safety requirements and measures (5.3 and 6.2.2) shall be verified as follows: the noise
emisson values such as the emission sound pressure level at the workstation and the sound power level shall
be determined according to !EN ISO 15744:2008" and declared as dual-number declaration according to
EN ISO 4871.

7.2

Vibration

Compliance with 5.4 and 6.2.2 shall be verified as follows:
The vibration level at the handle of the die grinder shall be measured and stated according to EN 28662-1 and
EN ISO 8662-13.
The vibration level at the handle of the reciprocating file shall be measured and stated according to
EN 28662-1 and EN ISO 8662-12.
The vibration value shall be declared according to EN 12096.

7.3

Unintentional start

Compliance with 5.7.2 shall be verified as follows:
The power tools for which two separate and dissimilar actions to start are required shall be checked by visual
inspection
The power tool shall be connected to the energy supply and placed in any possible position and pulled over
the horizontal plane by its hose.
Continuous operation of the start and stop device shall then not occur.

15

BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

7.4

Structure of verification

Safety requirement

5.1.1

Visual check

Functional
check

Measurement

Reference to clauses
of this standard or to
other standards

X

Surfaces, edges and
angles
5.1.2

X

Stability
5.1.3

X

Run-down time
5.1.4

X

High pressure ejection
5.1.5

X

X

Speed control
5.2

X

EN 563

X

!EN ISO
15744:2008"

Thermal safety
5.3
Noise

7.1
5.4

X

EN 28662

Vibration
5.5.2

X

Dust
5.6.1

X

Handle
5.6.2

X

X

Control device
5.6.3

X

Suspension device
5.7.1

X

Start and stop device
5.7.2
Unintentional start

16

X

X

7.3


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

Annex A
(informative)
Examples of die grinders covered by this part of EN 792

E die grinder (straight)
F meuleuse d'outillage droite

D Geradeschleifmaschine mit Schleifstift

E die grinder (angle)
F meuleuse d'outillage d'angle
D Winkelschleifmaschine mit Schleifstift

E rotary file
F limeuse-fraiseuse rotative
D Rotierende Feile

E reciprocating file
F limeuse-fraiseuse alternative
D Transversale Feile

17


BS EN 792-9:2001+A1:2008
EN 792-9:2001+A1:2008 (E)

Annex B
(informative)
Symbols for labels and signs

Symbol

Significance

Colours

B.1

The operator's instruction
shall be read before work
starts

Background: blue

Hearing protection shall be
worn

Background: blue
Symbol: white

B.2

Corresponding
standard

Symbol: white

ISO 3864
EN 61310

B.3

B.4

Eye protection shall be used
or safety glasses worn

Direction of rotation

Background: blue

ISO 3864

Symbol: white

EN 61310

Background:
optional
Symbol: black

18