SIST EN ISO 19432:2006

SLOVENSKI STANDARD
01-september-2006
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Building construction machinery and equipment - Portable, hand-held, internal
combustion engine driven cut-off machines - Safety requirements and testing (ISO
19432:2006)
Baumaschinen und -ausrüstungen - Tragbare, handgeführte Trennschleifmaschinen mit
Verbrennungsmotor - Sicherheit und Prüfverfahren (ISO 19432:2006)
Machines et matériel pour la construction des bâtiments - Tronçonneuses a disques,
portatives, a moteur a combustion interne - Exigences de sécurité et essais (ISO
19432:2006)
Ta slovenski standard je istoveten z: EN ISO 19432:2006
ICS:
25.140.01 5RþQDRURGMDQDVSORãQR Hand-held tools in general
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 19432
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2006
ICS 91.220 Supersedes EN 1454:1997
English Version
Building construction machinery and equipment - Portable,
hand-held, internal combustion engine driven cut-off machines -
Safety requirements and testing (ISO 19432:2006)
Machines et matériel pour la construction des bâtiments - Baumaschinen und -ausrüstungen - Tragbare,
Tronçonneuses à disques, portatives, à moteur à handgeführte Trennschleifmaschinen mit
combustion interne - Exigences de sécurité et essais (ISO Verbrennungsmotor - Sicherheit und Prüfverfahren (ISO
19432:2006) 19432:2006)
This European Standard was approved by CEN on 9 March 2006.
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, 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  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19432:2006: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 19432:2006) has been prepared by Technical Committee ISO/TC 195
"Building construction machinery and equipment" in collaboration with Technical Committee
CEN/TC 151 "Construction equipment and building material machines - Safety", the secretariat of
which is held by DIN.
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 2006, and conflicting national
standards shall be withdrawn at the latest by September 2006.

This document supersedes EN 1454:1997.

This document 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 Annex ZA, which is an integral part of this
document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, 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.

Endorsement notice
The text of ISO 19432:2006 has been approved by CEN as EN ISO 19432:2006 without any
modifications.
ANNEX ZA
(informative)
Relationship between this International Standard and the Essential
Requirements of EU Directive 98/37/EC, amended by Directive

98/79/EC
This International Standard has been prepared under a mandate given to CEN by the European

Commission and the European Free Trade Association to provide one means of conforming to
Essential Requirements of the New Approach Directive Machinery Directive 98/37/EC, amended by
Directive 98/79/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive
and has been implemented as a national standard in at least one Member State, compliance with
the normative clauses of this International standard confers, within the limits of the scope of this
standard, a presumption of conformity with Essential Requirement 2.2 of that Directive and
associated EFTA regulations.
WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this International standard.

INTERNATIONAL ISO
STANDARD 19432
First edition
2006-03-15
Building construction machinery and
equipment — Portable, hand-held,
internal combustion engine driven cut-off
machines — Safety requirements and
testing
Machines et matériel pour la construction des bâtiments —
Tronçonneuses à disques, portatives, à moteur à combustion interne —
Exigences de sécurité et essais

Reference number
ISO 19432:2006(E)
©
ISO 2006
ISO 19432:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 19432:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 List of significant hazards . 4
5 Safety requirements and verification. 5
5.1 General. 5
5.2 Handles . 6
5.3 Speed . 6
5.4 Engine stopping device. 7
5.5 Throttle control . 7
5.6 Clutch. 8
5.7 Exhaust gases. 8
5.8 Cutting debris discharge . 8
5.9 Tank openings. 9
5.10 Protection against contact with parts under high voltage . 9
5.11 Transmission cover(s). 9
5.12 Protection against contact with hot parts. 9
5.13 Cut-off wheel guard . 11
5.14 Flange locking device. 12
5.15 Flange assembly. 13
5.16 Spindle diameter. 14
5.17 Special tools. 14
5.18 Noise . 14
5.19 Vibration . 14
6 Information for use . 15
6.1 Instruction handbook . 15
6.2 Markings . 18
6.3 Warnings. 18
Annex A (normative) Strength test of cut-off wheel guard. 19
Annex B (normative) Noise test code — Engineering method (grade 2 of accuracy) . 21
Annex C (normative) Measurement of vibration values at the handles . 29
Annex D (informative) Recommended pictorials and symbols . 36
Bibliography . 37

ISO 19432:2006(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19432 was prepared by Technical Committee ISO/TC 195, Building construction machinery and
equipment.
iv © ISO 2006 – All rights reserved

ISO 19432:2006(E)
Introduction
The structure of safety standards in the field of machinery is as follows.
a) Type-A standards (basis standards) give basic concepts, principles for design, and general aspects that
can be applied to machinery.
b) Type-B standards (generic safety standards) deal with one or more safety aspect(s) or one or more
type(s) of safeguards that can be used across a wide range of machinery:
⎯ type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
⎯ type-B2 standards on safeguards (e.g. two-hands controls, interlocking devices, pressure-sensitive
devices, guards).
c) Type-C standards (machinery safety standards) deal with detailed safety requirements for a particular
machine or group of machines.
This International Standard is a type-C standard as stated in ISO 12100-1.
When provisions of this type-C standard are different from those which are stated in type-A or type-B
standards, the provisions of this type-C standard take precedence over the provisions of the other standards
for machines that have been designed and built according to the provisions of this type-C standard.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered as
indicated in the scope of this International Standard.
This International Standard is based on EN 1454:1998 and an ANSI draft.

INTERNATIONAL STANDARD ISO 19432:2006(E)

Building construction machinery and equipment — Portable,
hand-held, internal combustion engine driven cut-off
machines — Safety requirements and testing
1 Scope
This International Standard specifies safety requirements and their verification by testing for the design and
construction of portable, hand-held, internal combustion engine driven, cut-off machines, intended to be used
by a single operator in the cutting of construction materials, such as asphalt, concrete, stone and metal. It is
applicable to those machines designed purposely for use with a rotating, bonded-abrasive and/or
superabrasive (diamond) cut-off wheel having a maximum outside diameter of 406 mm, centre-mounted on,
and driven by, a spindle shaft, where the top of the wheel rotates away from the operator (see Figure 1).
This International Standard deals with all significant hazards related to the hand-held use of such machines
(see Clause 4). It specifies methods for the elimination or reduction of hazards arising from their use, as well
as the type of information on safe working practices to be provided with the machines. Cut-off machines
designed in accordance with this International Standard are intended to be used by persons who have read
and understood the safety requirements given in the “instruction handbook” and who use the appropriate
personal protective equipment (PPE).
Except for noise, environmental aspects are not considered by this International Standard; nor are cut-off
[1] [2]
wheel specifications given — for such specifications, see, for example, EN 12413 and EN 13236 .
This International Standard is not applicable to machines manufactured before the date of its publication.
2 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.
ISO 3744:1994, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering method in an essentially free field over a reflecting plane
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 5348:1998, Mechanical vibration and shock — Mechanical mounting of accelerometers
ISO 5349-2:2001, Mechanical vibration — Measurement and evaluation of human exposure to hand-
transmitted vibration — Part 2: Practical guidance for measurement at the workplace
ISO 7293:1997, Forestry machinery — Portable chain-saws — Engine performance and fuel consumption
ISO 7914:2002, Forestry machinery — Portable chain-saws — Minimum handle clearance and sizes
ISO 8041:1990, Human response to vibration — Measuring instrumentation
ISO 19432:2006(E)
ISO 11201:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission
sound pressure levels at a work station and at other specified positions — Engineering method in an
essentially free field over a reflecting plane
ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning
ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology
ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical
principles
ISO 13852:1996, Safety of machinery — Safety distances to prevent danger zones being reached by the
upper limbs
ISO 16063-1:1998, Methods for the calibration of vibration and shock transducers — Part 1: Basic concepts
IEC 60745-1:2003, Hand-held motor-operated electric tools — Safety — Part 1: General requirements
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100-1 and the following apply.
3.1
cut-off wheel
wheel composed of abrasive particles bonded together by an appropriate binder and incorporating, if
necessary, some appropriate form of reinforcement, or made of metal or other materials of similar properties
and having diamond, CBN-particles or other suitable abrasive particles bonded to its rim
3.2
arbor hole
centre hole of the cut-off wheel used for mounting the cut-off wheel on the machine spindle
3.3
blotter
washers made from some compressible material (e.g. paper, card or similar), attached to each side of the
cut-off wheel, the function of which is to smooth imperfections in the cut-off wheel and allow a limited degree
of slip when the wheel stalls in use
3.4
choke
device for enriching the fuel air mixture in the carburettor, to aid starting
3.5
clutch
device for connecting and disconnecting the driven member to and from a rotating source of power
3.6
cut-off wheel guard
partial enclosure intended to deflect cutting debris, as well as pieces of the cut-off wheel in the event that the
wheel is broken in operation
3.7
engine stopping device
device by which the stopping of the power source is initiated
2 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
3.8
flange contact surface
area between the inner and the outer circumference on the flange, which forms the contact surface between
the flange and the cut-off wheel
3.9
flange assembly
device provided to clamp and drive the cut-off wheel
3.10
handle
device designed to facilitate safe and easy control of the machine
3.10.1
front handle
handle located at or towards the front of the engine housing
3.10.2
rear handle
handle located at or towards the rear of the power source housing
3.11
idle speed
speed at which the engine runs with no load and throttle control released and the cut-off wheel does not rotate
3.12
reactive forces
sudden and unexpected motion of the machine, which can occur when the rotating cut-off wheel contacts a
foreign object during cutting or because of pinching
3.13
maximum depth of cut
t
distance to which the cut-off wheel can enter the work-piece as measured from the outside diameter of the
wheel to the outside diameter of the flange
3.14
maximum cut-off wheel speed
maximum permitted speed of a new cut-off wheel marked on the cut-off wheel
3.15
maximum spindle speed
maximum speed at which the spindle rotates with full open throttle and no load
3.16
silencer
device for reducing engine exhaust noise and directing the exhaust gases
3.17
rated speed
engine speed at which maximum power occurs
3.18
spindle
shaft of the cut-off machine, which supports, retains and drives the cut-off wheel in connection with the flanges
3.19
throttle control
device for controlling the engine speed
ISO 19432:2006(E)
3.20
throttle lock
device for temporarily setting the throttle in a partially open position, to aid starting
3.21
throttle lock-out
device that prevents the unintentional operation of the throttle trigger until manually released
3.22
throttle control linkage
mechanism which transmits motion from the throttle control to the throttle control valve
3.23
transmission cover
device between the engine and the cutting equipment designed to prevent unintentional contact with the
transmission
4 List of significant hazards
This clause lists significant hazards, hazardous situations and events as far as they are dealt with in this
document, identified by risk assessment as significant for this type of machinery, and which require action to
eliminate or reduce the risk. See Table 1.
4 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
Table 1 — List of significant hazards
Clause(s) in this
No. Hazard International Standard
dealing with the hazard
1 Mechanical hazards due to cutting, impact and reactive forces (i.e. climbing, 5.2; 5.11; 5.13; 5.14; 5.15;
pulling and especially reactive forces) related to the cut-off wheel and the 5.16; 6.1.2
transmission to the cut-off wheel
2 Electrical hazards due to contact with parts under high voltage (direct contact) or 5.10
parts which have become under high voltage under faulty conditions (indirect
contact)
3 Thermal hazards resulting in burns, scalds and other injuries, by a possible contact 5.12
of persons with objects or materials with high temperature including the radiation of
heat sources
4 Noise, resulting in hearing losses (deafness) and other physiological disorders 5.18; 6.1; 6.3
(e.g. loss of balance; loss of awareness) and interference with auditory signals and
speech communication
5 Vibration (resulting in peripheral circulatory and nervous functional disturbances in 5.19; 6.1; 6.3
the hand-arm system, such as “white finger” disease)
6 Contact with or inhalation of harmful fluids, gases, mists and fumes related to 5.7.1; 5.8, 5.13.1; 6.1.2, 6.3
exhaust gases and dust related to debris of cut-off materials
7 Fire or explosion related to fuel spillage 5.9, 6.1.2
8 Neglecting of ergonomic principles in machine design such as hazards from 5.2; 5.5; 6.1.2; 6.3
unhealthy postures or excessive efforts and inadequate consideration of human
hand-arm anatomy related to handle design, machine balance
9 Unexpected start-up, unexpected overrun/over-speed from failure/disorder of the 5.2; 5.4; 5.5; 5.6;
control system related to failure in the handles and position of the controls
10 Impossibility of stopping the machine in the best possible conditions related to the 5.2; 5.4
handle strength and position of the engine stopping device
11 Failure of the control system related to handle strength, position of controls and 5.5; 6.3
marking
12 Brake up during operation related to cut-off wheel 5.3; 5.14; 6.1; 6.3
13 Ejection of objects related to debris 5.3; 5.8; 5.13, 6.1.2; 6.3

5 Safety requirements and verification
CAUTION — Some of the tests specified in this International Standard involve processes that could
lead to a hazardous situation. Any person performing tests in accordance with this International
Standard shall be appropriately trained in the type of work to be carried out. All national regulatory
conditions and health and safety requirements shall be followed.
5.1 General
The safe running of cut-off machines depends on both the safety requirements according to this clause and
the safe working conditions associated with the use of adequate personal protection equipment (PPE), such
as gloves, leg protection, boots, and eye, ear and head protection equipment (see Clause 6).
Cut-off machines shall comply with the safety requirements and/or protective measures of this clause. Cut-off
machines shall also be marked according to 6.2 and wear warnings according to 6.3. In addition, the machine
shall be designed according to the principles of ISO 12100-2 for hazards relevant but not significant, which are
not dealt with by this document.
ISO 19432:2006(E)
When the machine is placed in its normal position on a flat horizontal surface (see Figure 1), the cut-off wheel
or the guard shall not touch the horizontal plane and the machine shall remain stable.

Figure 1 — Example of cut-off machine placed in normal position on flat surface
5.2 Handles
5.2.1 Requirements
Cut-off machines shall have a handle for each hand. These handles shall be designed so that they
⎯ can be fully gripped by an operator when wearing protective gloves,
⎯ provide the necessary sureness of grip by their shaping and surface, and
⎯ conform to the dimensions and clearances, except distances B and C, given in ISO 7914:2002.
Cut-off machines with a system to isolate the machine vibration from the handles shall be designed so that the
machine maintains structural integrity allowing the operator to control the machine, even in the event of partial
or full failure of the vibration isolators.
5.2.2 Verification
Dimensions shall be verified by measurements. The ability to control the machine if a failure occurs in the
vibration isolators shall be verified by inspection of the design.
5.3 Speed
5.3.1 Requirement
Engine speed shall be limited so that it is not possible to accelerate the engine in excess of the maximum
spindle speed. The maximum spindle speed shall be specified in the instruction handbook.
5.3.2 Verification
The limitation to adjust engine speed shall be verified by inspection and measurement. The function of the
throttle control shall be verified by inspection while operating the machine.
The spindle speed shall be measured at the spindle. Simple calculations using the engine speed and the
transmission ratio shall not be permitted due to the potential for slippage in the energy transmission from the
engine to the shaft.
6 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
5.4 Engine stopping device
5.4.1 Requirements
The machine shall be fitted with an engine stopping device by which the engine can be brought to a final stop
and which does not depend on sustained manual effort for its operation. The control for this device shall be so
positioned that it can be operated by the operator's right hand while holding the saw and wearing protective
gloves. The purpose and method of operation of the device shall be clearly and durably marked, see 6.2.
The colour of the control shall clearly contrast with the background.
5.4.2 Verification
The function of the engine stopping device shall be verified by inspection while the machine is being operated.
The control location shall be verified by inspection.
5.5 Throttle control
5.5.1 Dimensions
5.5.1.1 Requirements
The throttle control shall be positioned so that it can be pressed and released with a gloved hand while
holding the rear handle by fulfilling the dimensional requirements for clearance around and behind the throttle
control as shown in ISO 7914:2002, Figures 4 and 5.
5.5.1.2 Verification
The dimensions shall be verified by measurement.
5.5.2 Unintentional movement
5.5.2.1 Requirements
Unintentional movement of the cut-off wheel shall be minimized by a throttle control that, when released,
automatically reverts to the idling position and is retained in that position by the automatic engagement of a
throttle control lock-out.
The throttle control linkage shall be so designed that a force applied on the rear handle shall not increase the
engine speed to a point where the clutch engages and cut-off wheel movement begins.
5.5.2.2 Verification
The function of the throttle control, throttle control lock-out and the throttle lock shall be verified by inspection
while operating the machine. If a relative motion is possible between the carburettor and the throttle control,
then the throttle control linkage design shall be verified by applying a force in any direction related to the plane
of the cut-off wheel, on the centre of the rear handle grip, equal to three times the weight of the cut-off
machine unit without accessories, with the cut-off wheel and with the tanks empty and the machine body
secured.
5.5.3 Throttle lock
5.5.3.1 Requirement
If a throttle lock is provided for cold starting, it shall be such that the lock has to be engaged manually and is
automatically released when the throttle trigger is operated.
ISO 19432:2006(E)
5.5.3.2 Verification
The function of the throttle lock shall be verified by inspection while operating the machine.
5.6 Clutch
5.6.1 Requirements
The cut-off machine shall have a clutch so designed that the cut-off wheel does not move when the engine
rotates at any speed less than 1,25 times the idling speed. The idling speed shall be specified in the
instruction handbook.
5.6.2 Verification
The function of the clutch shall be verified by running the engine with any speed up to, but not including,
1,25 times the idling speed.
5.7 Exhaust gases
5.7.1 Requirements
The exhaust outlet shall be designed so that the exhaust gases are directed away from the operator when the
machine is held in a typical cutting position as shown in Figure 2.

Figure 2 — Example of cut-off machine held in typical cutting position
5.7.2 Verification
The location and direction of the exhaust outlet shall be verified by inspection.
5.8 Cutting debris discharge
5.8.1 Requirements
The cut-off machine shall be designed so that the main stream of cutting debris from the cut-off wheel is
directed away from the operator’s face or upper body when holding the machine in a typical cutting position as
shown in Figure 2. (See also 5.13.1.) Instructions for wheel guard adjustments shall be provided in the
instruction handbook.
5.8.2 Verification
The direction of the cutting debris shall be verified by inspection.
8 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
5.9 Tank openings
5.9.1 Requirements
Each cap shall have a retainer to prevent the cap from being lost.
The fuel tank opening shall be at least 20 mm diameter. The cap or opening shall be clearly marked, see 6.2.
The design of the cap shall be such that no leakage occurs while the machine is at the normal operating
temperature, in all working positions and while being transported.
The fuel tank and, if provided, oil tank filler opening shall be so located that the filling of the tank is not
obstructed by other machine components.
Each cap or opening shall be clearly and durably identified. If only the caps are identified, they shall not be
interchangeable.
5.9.2 Verification
The fuel cap retainer and opening dimensions are verified by inspection. The tightness of the caps shall be
verified by inspection while turning the saw in any direction. Seepage or evaporation from fuel tank ventilation
systems (if provided) are not regarded as leakage.
5.10 Protection against contact with parts under high voltage
5.10.1 Requirements
All high voltage parts of the circuit, including spark plug terminals, shall be located and/or insulated so that the
operator cannot make unintentional contact with them.
5.10.2 Verification
The location and insulation of the parts under high voltage shall be verified by inspection and using a finger
probe as specified in IEC 60745-1:2003, Figure 1.
5.11 Transmission cover(s)
5.11.1 Requirements
The transmission shall be covered to prevent operator contact during operation by a suitable guard in
accordance with ISO 13852:1996, 4.5.1 and 4.5.3.
5.11.2 Verification
The compliance shall be verified by measurement.
5.12 Protection against contact with hot parts
5.12.1 Requirements
The cylinder and the silencer or other parts that could come in direct contact with the cylinder or silencer shall
be protected so that they are not accessible to unintentional contact during normal operation of the machine.
This applies to parts which are less than 120 mm away from the far side of the front handle above the
machine (see Figure 3) and less than 80 mm from the far side of the front handle at the sides of the machine
(see Figure 4). It also applies to the area of the silencer which can be contacted by the extension of a straight
ISO 19432:2006(E)
line between the outer side of the front handle above the machine and the outer edge of the housing over the
silencer (dimension W 0 in Figure 5).
The protection shall ensure that the accessible area does not exceed 10 cm . The temperature for the
accessible parts of the machine as defined above, as well as the guard for the cylinder, shall not cause a
hazard to the operator.
Dimensions in millimetres
Key Key
1 silencer 1 silencer
2 front handle 2 front handle
Figure 3 — Required distance between front Figure 4 — Required lateral distance between front
handle and unprotected hot part handle and unprotected hot parts — Plan view
Dimensions in millimetres
Key
1 silencer
2 front handle
3 housing
Figure 5 — Guarding against contact with hot parts
5.12.2 Verification
The guarding of the cylinder or silencer shall be verified by measuring the required distances. Guards for the
silencer shall be verified by determining the area accessible by applying the test cone as shown in Figure 6
with minimum force in any direction.
10 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
Dimensions in millimetres
Figure 6 — Test cone
5.13 Cut-off wheel guard
5.13.1 Requirements
The machine shall have a cut-off wheel guard that requires the use of a tool for attachment or removal. The
cut-off-wheel guard shall cover no less than 180° of the circumference of the intended wheels, see Figure 7.

Key
t maximum depth of cut
X radial clearance
Figure 7 — Cut-off wheel guard dimensions and maximum depth of cut
If the guard is designed to rotate around the wheel centre, tools shall not be required to complete the
adjustment.
The radial clearance (see Figure 7) between the periphery of a new cut-off wheel with the greatest diameter
and the inside of the guard shall not allow the mounting of the wheel with the next larger nominal outside
diameter (see Table 2). The greatest outside cut-off wheel allowed shall be specified in the instruction
handbook.
The machine design shall incorporate a provision to mount a device for wet or dry dust suppression (e.g. fluid
spray).
ISO 19432:2006(E)
Table 2 — Cut-off wheel and flange dimensions — Abrasive and superabrasive wheels
Dimensions in millimetres
Cut-off wheel Flange assembly
Minimum radial width of
Nominal outside diameter Minimum outside diameter Minimum recess
contact surface
D d w e
f
u 250 63,5 7,9 1,5
> 250; u 300 75 13 1,5
> 300; u 350 87,5 15 1,5
> 350; u 406 100 17 1,5
The strength of the cut-off wheel guard shall comply with Annex A and remain functionally intact after the tests.
Minor deformations and superficial damage are accepted. Any fixing devices, such as screws, shall remain
intact.
5.13.2 Verification
The attachment of the guard and the enclosure of the wheel shall be verified by inspection and measurement.
The strength requirements shall be verified by functional testing in accordance with Annex A.
5.14 Flange locking device
5.14.1 Requirements
The flanges shall have positive locking to the spindle to prevent flange rotation on the spindle. The fastening
method of the flanges and the cut-off wheel to the spindle shall not loosen by rotational forces or torque from
the spindle. When applying a torque, M, as specified in 5.14.2, there shall be no movement between the
cut-off wheel and the flanges and the spindle.
5.14.2 Verification
The locking of the flanges to the spindle shall be verified by the following tests.
d) Attach the cut-off wheel and flanges to the spindle with the specified tightening torque (see 5.15.1).
e) Lock the spindle and apply a rotational torque to the cut-off wheel as a tangential force to the
circumference to the cut-off wheel
Calculate the torque, M, expressed in newton metres (N ⋅ m):
M = 0,4 × V × k
where
V is engine displacement in (cubic metres) cm ;
k is the gear ratio (engine/spindle speed).
f) Repeat the test five times in the normal rotational direction, then five times in the opposite direction of
rotation. Observe for any movement.
12 © ISO 2006 – All rights reserved

ISO 19432:2006(E)
5.15 Flange assembly
5.15.1 Requirements
The machine shall be equipped with two flanges (see Figure 8) made of steel or other material having
comparable physical properties and which comply with the dimensions given in Table 2 for all types of cut-off
wheels and Table 3 for superabrasive (diamond) cut-off wheels only. Both flanges shall have the same outer
diameter and the same contact surface.
Flanges according to Table 2 shall always be provided with the machine. Optionally, flanges with the
dimensions according to Table 3 may be provided and shall be marked “For superabrasive cut-off wheels
only.”
Flanges will be considered suitable if they are mounted as shown in Figure 8, and loaded with the tightening
torque. The contact surface, w, of the flange shall be flat after the loading. The tightening torque shall be
specified in the instruction handbook. The instruction handbook shall also provide information on correct
combination of flanges and cut-off wheel.
5.15.2 Verification
The dimensions and radial width of the flanges shall be verified by measurement. After applying the tightening
torque, the flatness of the flanges and the contact with the cut-off wheel shall be verified by inspection and
gauging with a 0,05 mm thick gauge. It shall not be possible to insert the gauge at any point around the flange
circumference between the radial contact surface of the flange and the surface of the cut-off wheel. Blotters
shall not be used during the test.

Key
1 cut-off wheel
2 flange
Figure 8 — Cut-off wheel and flange dimensions
Table 3 — Cut-off wheel and flange dimensions — Superabrasive wheels only
Dimensions in millimetres
Cut-off wheel Flange assembly
Minimum radial width of
Nominal outside diameter Minimum outside diameter Minimum recess
contact surface
D d w e
f
u 250 37,5 6 1,5
> 250; u 300 45 7,2 1,5
> 300; u 350 52,5 8,4 1,5
> 350; u 406 60 9,6 1,5
ISO 19432:2006(E)
5.16 Spindle diameter
The nominal diameter for the spindle shall be equal to the arbor hole diameter of the cut-off wheel with a
tolerance of 0 mm to − 0,06 mm.
5.17 Special tools
5.17.1 Requirements
If special tools are needed for mounting and removal of the cut-off wheel and for adjusting the idle speed, they
shall be provided with the machine. Information shall be given in the instruction handbook.
5.17.2 Verification
This requirement shall be verified by inspection.
5.18 Noise
5.18.1 Reduction by design, at source and by protective measures
The machine shall generate noise levels as low as practicable. The main sources causing and influencing
noise are the air intake system, engine cooling system, engine exhaust system, cutting system and vibrating
surfaces.
See ISO/TR 11688-1 for general technical information on widely recognized technical rules and means to be
followed in the design of low-noise machines. Special care shall be taken in the acoustical design of machine.
[4]
NOTE ISO/TR 11688-2 gives useful information on noise generation mechanisms in machinery, while
[5] [6] [7]
ISO 14163 gives guidelines for noise control by silencer; ISO 11691 and ISO 11820 can be used for the testing of
the silencer.
5.18.2 Reduction by information
Information on residual risks, after technical measures to control noise emission at the design stage have
been implemented, shall be given in the instruction handbook (see 6.1.2).
5.18.3 Verification
The effectiveness of the noise reduction measures implemented at the design stage shall be verified by
measurement. The A-weighted emission sound pressure level at the operator's position and the sound power
levels shall be determined in accordance with Annex B
NOTE Octave band sound pressure levels at the operator's position could be needed to enable the selection of
correct hearing protection.
5.19 Vibration
5.19.1 Reduction by design, at source by protective measures
The machine shall be designed to generate vibration values as low as practicable. The main sources causing
and influencing vibration are the dynamic forces from engine, cutting means, unbalanced moving parts, impact
in gear sprockets, bearings and other mechanisms and the interaction between operator, machine and
material being worked.
[8]
NOTE CR 1030-1 gives general technical information on widely recognized technical rules and means and can be
used as a guideline for the design of redu
...