SIST EN ISO 28927-11:2011

Hand-held portable power tools - Test methods for evaluation of vibration emission - Part 11: Stone hammers (ISO 28927-11:2011)

This part of ISO 28927 specifies a laboratory method for measuring hand-transmitted vibration emission at the handles of hand-held stone hammers. It is a type-test procedure for establishing the magnitude of vibration in the gripping areas of a stone hammer when operated in laboratory conditions. It is intended that the results be used to compare different models of the same type of machine. This part of ISO 28927 is applicable to engraving pens and stone hammers intended for use by stone masons, driven pneumatically or by other means. It is not applicable to demolition hammers or to chipping hammers primarily intended for use on metal or in construction.

Handgehaltene motorbetriebene Maschinen - Messverfahren zur Ermittlung der Schwingungsemission - Teil 11: Steinbearbeitungsmaschinen (ISO 28927-11:2011)

Dieser Teil von ISO 28927 legt ein Laborverfahren zur Messung der Hand-Arm-Schwingungen fest, die an
den Handgriffen von handgehaltenen Steinbearbeitungsmaschinen hervorgerufen werden. Es handelt sich um
ein Messverfahren zur Ermittlung der Schwingungskennwerte (Schwingungsemissionswerte) an den Greifstellen
der Steinbearbeitungsmaschine, die unter Laborbedingungen betrieben wird.
Dieser Teil von ISO 28927 gilt für Gravierstifte und Steinbearbeitungsmaschinen, die für Steinmetzarbeiten
vorgesehen sind.
Die Maschinen, die dieser Teil von ISO 28927 behandelt, können pneumatisch oder auf andere Weise
angetrieben sein. In den Bildern 1 bis 4 sind typische Maschinen dargestellt.
Dieser Teil von ISO 28927 gilt für die in Abschnitt 5 genannten Maschinen. Er gilt nicht für Stemmhämmer und
Meißelhämmer, die hauptsächlich für den Einsatz auf dem Bau oder bei der Metallbearbeitung vorgesehen
sind.
Der Zweck besteht darin, dass die Kennwerte zum Vergleich verschiedener Modelle derselben Maschinenart
verwendet werden können.

Machines à moteur portatives - Méthodes d'essai pour l'évaluation de l'émission de vibrations - Partie 11: Casse-pierres (ISO 28927-11:2011)

L'ISO 28927-11:2011 spécifie une méthode de mesure en laboratoire des émissions de vibrations transmises aux mains s'exerçant au niveau des poignées des casse-pierres portatifs. Il s'agit d'une méthode d'essai de type définissant l'amplitude des vibrations aux zones de préhension d'un casse-pierres fonctionnant dans des conditions d'essai de type. Il est prévu d'utiliser les résultats pour comparer différents modèles du même type de machine.
L'ISO 28927-11:2011 s'applique aux outils de gravure et aux casse-pierres utilisés par les maçons en pierres, pneumatiques ou entraînés par un autre dispositif. Elle ne s'applique pas aux marteaux de démolition ou aux marteaux burineurs prévus principalement pour être utilisés sur du métal ou en construction.

Ročna prenosna električna orodja - Preskusne metode za vrednotenje oddajanja vibracij - 11. del: Stroji za obdelavo kamna (ISO 28927-11:2011)

Ta del ISO 28927 določa laboratorijsko metodo merjenja emisij ročnega oddajanja vibracij na ročajih ročnih strojev za obdelavo kamna. To je postopek tipskega preskusa za vzpostavljanje razsežnosti vibracij v območju stroja za obdelavo kamna, ko deluje v laboratorijskih pogojih. Njegov namen je, da se rezultati uporabijo za primerjavo različnih modelov strojev istega tipa. Ta del ISO 28927 velja za gravurna peresa in stroje za obdelavo kamnov, ki jih uporabljajo kamnoseki in so gnani pnevmatično ali kako drugače. Ne velja za rušitvene stroje ali za krušilne stroje, primerne predvsem za uporabo na kovini ali pri gradnji.

General Information

• Status: Published
• Public Enquiry End Date: 04-Jan-2010
• Publication Date: 12-Sep-2011
• ICS: 13.160 - Vibration and shock with respect to human beings
• ICS: 25.140.01 - Hand-held tools in general
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Aug-2011
• Due Date: 10-Oct-2011
• Completion Date: 13-Sep-2011
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Ref Project: EN ISO 28927-11:2011 - Hand-held portable power tools - Test methods for evaluation of vibration emission - Part 11: Stone hammers (ISO 28927-11:2011)

Relations

• Replaces: SIST EN ISO 8662-14:2000 - Hand-held portable power tools - Measurement of vibrations at the handle - Part 14: Stone-working tools and needle scalers (ISO 8662-14:1996)
• Effective Date: 01-Sep-2011
• Replaces: SIST EN ISO 8662-14:2000 - Hand-held portable power tools - Measurement of vibrations at the handle - Part 14: Stone-working tools and needle scalers (ISO 8662-14:1996)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 28927-11:2011
01-oktober-2011
1DGRPHãþD
SIST EN ISO 8662-14:2000
5RþQDSUHQRVQDHOHNWULþQDRURGMD3UHVNXVQHPHWRGH]DYUHGQRWHQMHRGGDMDQMD
YLEUDFLMGHO6WURML]DREGHODYRNDPQD,62
Hand-held portable power tools - Test methods for evaluation of vibration emission - Part
11: Stone hammers (ISO 28927-11:2011)
Handgehaltene motorbetriebene Maschinen - Messverfahren zur Ermittlung der
Schwingungsemission - Teil 11: Steinbearbeitungsmaschinen (ISO 28927-11:2011)
Machines à moteur portatives - Méthodes d'essai pour l'évaluation de l'émission de
vibrations - Partie 11: Casse-pierres (ISO 28927-11:2011)
Ta slovenski standard je istoveten z: EN ISO 28927-11:2011
ICS:
13.160 Vpliv vibracij in udarcev na Vibration and shock with
ljudi respect to human beings
25.140.01 5RþQDRURGMDQDVSORãQR Hand-held tools in general
SIST EN ISO 28927-11:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 28927-11:2011

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SIST EN ISO 28927-11:2011


EUROPEAN STANDARD
EN ISO 28927-11

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2011
ICS 25.140.10; 13.160 Supersedes EN ISO 8662-14:1996
English Version
Hand-held portable power tools - Test methods for evaluation of
vibration emission - Part 11: Stone hammers (ISO 28927-
11:2011)
Machines à moteur portatives - Méthodes d'essai pour Handgehaltene motorbetriebene Maschinen -
l'évaluation de l'émission de vibrations - Partie 11: Casse- Messverfahren zur Ermittlung der Schwingungsemission -
pierres (ISO 28927-11:2011) Teil 11: Steinbearbeitungsmaschinen (ISO 28927-11:2011)
This European Standard was approved by CEN on 29 January 2011.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 28927-11:2011: E
worldwide for CEN national Members.

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SIST EN ISO 28927-11:2011
EN ISO 28927-11:2011 (E)
Contents Page
Foreword .3
Annex ZA .4

2

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SIST EN ISO 28927-11:2011
EN ISO 28927-11:2011 (E)
Foreword
This document (EN ISO 28927-11:2011) has been prepared by Technical Committee ISO/TC 118
"Compressors and pneumatic tools, machines and equipment" in collaboration with Technical Committee
CEN/TC 231 “Mechanical vibration and shock” 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 August 2011, and conflicting national standards shall be withdrawn at
the latest by August 2011.
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 ISO 8662-14:1996.
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.
For relationship with EU Directive, 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, Bulgaria, Croatia, 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 the United Kingdom.
Endorsement notice
The text of ISO 28927-11:2011 has been approved by CEN as a EN ISO 28927-11:2011 without any
modification.
3

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SIST EN ISO 28927-11:2011
EN ISO 28927-11:2011 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the clauses of this
standard confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of that Directive excerpt ER 2.2.1.1 and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this European Standard.
4

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SIST EN ISO 28927-11:2011

INTERNATIONAL ISO
STANDARD 28927-11
First edition
2011-02-01


Hand-held portable power tools — Test
methods for evaluation of vibration
emission —
Part 11:
Stone hammers
Machines à moteur portatives — Méthodes d'essai pour l'évaluation de
l'émission de vibrations —
Partie 11: Casse-pierres





Reference number
ISO 28927-11:2011(E)
©
ISO 2011

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2011 – All rights reserved

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
Contents Page
Foreword .iv
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms, definitions and symbols .1
3.1 Terms and definitions .2
3.2 Symbols.2
4 Basic standards and vibration test codes .2
5 Description of the family of machines .3
6 Characterization of vibration.4
6.1 Direction of measurement .4
6.2 Location of measurements.4
6.3 Magnitude of vibration.6
6.4 Combination of vibration directions.6
7 Instrumentation requirements .7
7.1 General .7
7.2 Mounting of transducers .7
7.3 Frequency weighting filter.7
7.4 Integration time.7
7.5 Auxiliary equipment .8
7.6 Calibration.8
8 Testing and operating conditions of the machinery.8
8.1 General .8
8.2 Operating conditions .8
8.3 Other quantities to be specified.9
8.4 Attached equipment, workpiece and task.9
8.5 Operator .11
9 Measurement procedure and validity.11
9.1 Reported vibration values .11
9.2 Declaration and verification of the vibration emission value .12
10 Test report.12
Annex A (informative) Model test report for vibration emission of stone hammers.14
Annex B (normative) Determination of uncertainty .16
Bibliography.18

© ISO 2011 – All rights reserved iii

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(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 28927-11 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools,
machines and equipment, Subcommittee SC 3, Pneumatic tools and machines.
This first edition of ISO 28927-11 cancels and replaces ISO 8662-14:1996, of which it constitutes a technical
revision. The most important changes are
⎯ vibration measurement in three axes and at both hand positions,
⎯ new transducer positions are used,
⎯ definition of the transducer positions and orientation has been improved,
⎯ needle scalers have been moved to a new part “Scaling hammers and needle scalers” (ISO 28927-9),
and
⎯ energy absorber has been deleted and all tools are tested on stone.
ISO 28927 consists of the following parts, under the general title Hand-held portable power tools — Test
methods for evaluation of vibration emission:
1)
⎯ Part 1: Angle and vertical grinders
2)
⎯ Part 2: Wrenches, nutrunners and screwdrivers
3)
⎯ Part 3: Polishers and rotary, orbital and random orbital sanders

1) Together with ISO 28927-4, replaces ISO 8662-4, Hand-held portable power tools — Measurement of vibrations at
the handle — Part 4: Grinders.
2) Replaces ISO 8662-7, Hand-held portable power tools — Measurement of vibrations at the handle — Part 7:
Wrenches, screwdrivers and nut runners with impact, impulse or ratchet action. All screwdrivers and nutrunners except for
one-shot tools now covered.
3) Replaces ISO 8662-8, Hand-held portable power tools — Measurement of vibrations at the handle — Part 8:
Polishers and rotary, orbital and random orbital sanders.
iv © ISO 2011 – All rights reserved

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
4)
⎯ Part 4: Straight grinders
5)
⎯ Part 5: Drills and impact drills
6)
⎯ Part 6: Rammers
7)
⎯ Part 7: Nibblers and shears
⎯ Part 8: Saws, polishing and filing machines with reciprocating action and small saws with oscillating or
8)
rotating action
9)
⎯ Part 9: Scaling hammers and needle scalers
10)
⎯ Part 10: Percussive drills, hammers and breakers
11)
⎯ Part 11: Stone hammers
12)
⎯ Part 12: Die grinders

4) Together with ISO 29827-1, replaces ISO 8662-4, Hand-held portable power tools — Measurement of vibrations at
the handle — Part 4: Grinders.
5) Replaces ISO 8662-6, Hand-held portable power tools — Measurement of vibrations at the handle — Part 6: Impact
drills. Non-impacting drills now covered.
6) Replaces ISO 8662-9, Hand-held portable power tools — Measurement of vibrations at the handle — Part 9:
Rammers.
7) Replaces ISO 8662-10, Hand-held portable power tools — Measurement of vibrations at the handle — Part 10:
Nibblers and shears.
8) Replaces ISO 8662-12, Hand-held portable power tools — Measurement of vibrations at the handle — Part 12: Saws
and files with reciprocating action and saws with oscillating or rotating action.
9) Together with this part of ISO 29827, replaces ISO 8662-14, Hand-held portable power tools — Measurement of
vibrations at the handle — Part 14: Stone-working tools and needle scalers.
10) To be published. Replaces ISO 8662-2, Hand-held portable power tools — Measurement of vibrations at the
handle — Part 2: Chipping hammers and riveting hammers, ISO 8662-3, Hand-held portable power tools — Measurement
of vibrations at the handle — Part 3: Rock drills and rotary hammers, and ISO 8662-5, Hand-held portable power tools —
Measurement of vibrations at the handle — Part 5: Pavement breakers and hammers for construction work. It also
incorporates the Amendments ISO 8662-2:1992/Amd.1:1999, ISO 8662-3:1992/Amd.1:1999 and
ISO 8662-5:1992/Amd.1:1999. Chipping and riveting hammers, rock drills and rotary hammers all covered.
11) Together with ISO 29827-9, replaces ISO 8662-14, Hand-held portable power tools — Measurement of vibrations at
the handle — Part 14: Stone-working tools and needle scalers.
12) Under preparation. Replaces ISO 8662-13, Hand-held portable power tools — Measurement of vibrations at the
handle — Part 13: Die grinders. It also incorporates the Technical Corrigendum ISO 8662-13:1997/Cor.1:1998.
© ISO 2011 – All rights reserved v

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
Introduction
This document is a type-C standard as stated in ISO 12100.
When requirements of this type-C standard are different from those which are stated in type-A or -B standards,
the requirements of this type-C standard take precedence over the requirements of the other standards for
machines that have been designed and built according to the requirements of this type-C standard.
The vibration test codes for portable hand-held machines given in ISO 28927 (all parts) are based on
ISO 20643, which gives general specifications for the measurement of the vibration emission of hand-held and
hand-guided machinery. ISO 28927 (all parts) specifies the operation of the machines under type-test
conditions and other requirements for the performance of type tests. The structure/numbering of its clauses
follows that of ISO 20643.
The basic principle for transducer positioning first introduced in the IEC 60745 series of European standards is
followed, representing a deviation from ISO 20643 for reasons of consistency. The transducers are primarily
positioned next to the hand in the area between the thumb and the index finger, where they give the least
disturbance to the operator gripping the machine.
It has been found that vibrations generated by stone hammers vary considerably in typical use. For stone
hammers, impacting action is the prime source of vibration. The variation is largely due to variations in the
handling of the machine and the characteristics of the material to work on. Differences in the support of the
material also cause differences in vibration. This part of ISO 28927 uses a working process where the
machine is used to work on a stone surface. To improve reproducibility of the test, it is important that the
material has good support and that inserted tools used are in good condition.
The values obtained are type-test values intended to be representative of the average of the upper quartile of
typical vibration magnitudes in real-world use of the machines. However, the actual magnitudes vary
considerably from time to time and depend on many factors, including the operator, the task and the inserted
tool or consumable. The state of maintenance of the machine itself might also be of importance. Under real
working conditions the influences of the operator and process can be particularly important at low magnitudes.
2
It is therefore not recommended that emission values below 2,5 m/s be used for estimating the vibration
2
magnitude under real working conditions. In such cases, 2,5 m/s is the recommended vibration magnitude for
estimating the machine vibration.
If accurate values for a specific work place are required, then measurements [according to ISO 5349 (all
parts)] in that work situation could be necessary. Vibration values measured in real working conditions can be
either higher or lower than the values obtained using this part of ISO 28927.
Higher vibration magnitudes can easily occur in real work situations, caused by the use of excessively worn
inserted tools.
The vibration test codes given in ISO 28927 (all parts) supersede those given in ISO 8662 (all parts), which
has been replaced by the corresponding parts of ISO 28927 (see Foreword).
NOTE ISO 8662-11, Hand-held portable power tools — Measurement of vibrations at the handle — Part 11: Fastener
driving tools, could be replaced by a future part of ISO 28927.

vi © ISO 2011 – All rights reserved

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SIST EN ISO 28927-11:2011
INTERNATIONAL STANDARD ISO 28927-11:2011(E)

Hand-held portable power tools — Test methods for evaluation
of vibration emission —
Part 11:
Stone hammers
1 Scope
This part of ISO 28927 specifies a laboratory method for measuring hand-transmitted vibration emission at the
handles of hand-held stone hammers. It is a type-test procedure for establishing the magnitude of vibration in
the gripping areas of a stone hammer when operated in laboratory conditions. It is intended that the results be
used to compare different models of the same type of machine.
This part of ISO 28927 is applicable to engraving pens and stone hammers intended for use by stone masons
(see Clause 5), driven pneumatically or by other means. It is not applicable to demolition hammers or to
chipping hammers primarily intended for use on metal or in construction.
NOTE To avoid confusion with the terms “power tool” and “inserted tool”, “machine” is used hereinafter for the former.
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 2787, Rotary and percussive pneumatic tools — Performance tests
ISO 5349, (all parts), Mechanical vibration — Measurement and evaluation of human exposure to hand-
transmitted vibration
ISO 5391:2003, Pneumatic tools and machines — Vocabulary
ISO 17066, Hydraulic tools — Vocabulary
ISO 20643:2005, Mechanical vibration — Hand-held or hand-guided machinery — Principles for evaluation of
vibration emission
EN 12096, Mechanical vibration — Declaration and verification of vibration emission values
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in ISO 5391, ISO 17066 and ISO 20643
and the following apply.
© ISO 2011 – All rights reserved 1

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
3.1 Terms and definitions
3.1.1
stone hammer
percussive machine for carving and chipping stone
NOTE Adapted form ISO 5391:2003, definition 2.2.6.
3.1.2
chisel
inserted tool with a straight edge, intended for carving stone
3.1.3
bush
inserted tool with teeth for levelling the surface of a stone workpiece and/or applying a pattern to the surface
of the stone
3.1.4
bush hammering
mechanical process which produces textured surfaces
NOTE Textures vary from subtle to rough.
3.2 Symbols
Symbol Description Unit
2
a root-mean-square (r.m.s.) single-axis acceleration value of m/s
hw
the frequency-weighted hand-transmitted vibration

2
a vibration total value of frequency-weighted r.m.s. m/s
hv
acceleration; root sum of squares of the a values for the
hw
three measured axes of vibration
a 2
arithmetic mean value of a values of runs for one m/s
hv
hv
operator for one hand position
a 2
a arithmetic mean value of hv values for all operators for m/s
h
one hand position
a
2
h arithmetic mean value of a values for one hand position on m/s
h
several machines
2
a declared vibration emission value m/s
hd
2
s standard deviation for a test series (for a sample, s) m/s
n−1
2
σ standard deviation of reproducibility (for a population, σ) m/s
R
C coefficient of variation for a test series
v
2
K uncertainty m/s

4 Basic standards and vibration test codes
This part of ISO 28927 is based on the requirements of ISO 20643 and corresponds to its structure in respect
of clause subjects and numbering, except for the annexes.
Annex A presents a model test report and Annex B the means for determining the uncertainty, K.
2 © ISO 2011 – All rights reserved

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
5 Description of the family of machines
This part of ISO 28927 applies to stone hammers, which are usually pneumatically powered straight machines
although some have a “D” handle or pistol grip handle. Some are fitted with spring-loaded sleeves to reduce
vibration transmitted to the operator's hand. The chisel is generally not fixed in the hammer but held by the
operator. Some chisels also have sleeves, attached either to the hammer or to the chisel with spring-loading
to reduce vibration.
This part of ISO 28927 is applicable to hand-held power-driven portable stone hammers.
It is not applicable to demolition hammers or to chipping hammers primarily intended for use on metal or in
construction.
Figures 1 to 3 show examples of stone hammers as specified in this part of ISO 28927. Figure 4 is an
example of a sleeved chisel intended to be used when the chisel needs to be guided using the left hand.


Figure 1 — Straight hammer


Figure 2 — Hammer with open or closed bow grip
© ISO 2011 – All rights reserved 3

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)

Figure 3 — Pistol grip hammer


Figure 4 — Sleeved chisel

6 Characterization of vibration
6.1 Direction of measurement
The vibration transmitted to the hand shall be measured and reported for three directions of an orthogonal
coordinate system. At each hand position, the vibration shall be measured simultaneously in the three
directions shown in Figures 5 to 8.
6.2 Location of measurements
Measurements shall be made at the gripping zones, where the operator normally holds the machine and
applies the feed force. For machines intended for one-handed operation, it is only necessary to measure at a
single point.
4 © ISO 2011 – All rights reserved

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SIST EN ISO 28927-11:2011
ISO 28927-11:2011(E)
The prescribed transducer location shall be as close as possible to the hand between the thumb and index
finger. This shall apply to both hand positions, with the machine held as in normal operation. Whenever
possible, measurements shall be made at the prescribed locations.
A secondary location is defined as being on the side of, and as close as possible to, the inner end of the
handle where the prescribed location is found. If the prescribed location of the transducer cannot be used, this
secondary location shall be used instead.
The prescribed or secondary locations shall also be used on anti-vibration handles.
Figures 5 to 8 show the prescribed and secondary locations and measurement directions for the hand
positions normally used for the different types of machines in this family.

Key
1 prescribed location
2 secondary location
Figure 5 — Straight hammer


Key
1 prescribed location
2 secondary location
Figure 6 — Hammer with open or closed bow grip
© ISO 2011 – All rights reserved 5

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