EN 847-3:2013

SLOVENSKI STANDARD
01-januar-2014
1DGRPHãþD
SIST EN 847-3:2004
Orodja za obdelavo lesa - Varnostne zahteve - 3. del: Vpenjalne naprave
Tools for woodworking - Safety requirements - Part 3: Clamping devices
Maschinen-Werkzeuge für Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil
3: Spannzeuge
Outils pour le travail du bois - Exigences de sécurité - Partie 3: Outils de serrage
Ta slovenski standard je istoveten z: EN 847-3:2013
ICS:
79.120.10 Lesnoobdelovalni stroji Woodworking machines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 847-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2013
ICS 79.120.10 Supersedes EN 847-3:2004
English Version
Tools for woodworking - Safety requirements - Part 3: Clamping
devices
Outils pour le travail du bois - Prescriptions de sécurité - Maschinen-Werkzeuge für Holzbearbeitung -
Partie 3: Outils de serrage Sicherheitstechnische Anforderungen - Teil 3: Spannzeuge
This European Standard was approved by CEN on 10 August 2013.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 847-3:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 List of significant hazards .6
5 Design requirements .7
5.1 General .7
5.2 Hydrostatic clamping devices with open system .7
5.3 Shape .7
5.4 Balance .7
5.5 Testing .8
5.5.1 Test sample and dimensions .8
5.5.2 Formulae and calculation . 10
5.5.3 Test procedure . 10
5.6 Requirements on tolerances of clamping devices . 11
6 Marking of clamping devices . 11
6.1 General . 11
6.2 Marking of clamping devices for bore mounted tools . 11
6.3 Marking of clamping devices for shank mounted tools . 11
6.4 Marking of one piece clamping devices for shank mounted tools . 12
7 Information for use . 12
7.1 General . 12
7.2 Safe working practice . 12
Bibliography . 13

Foreword
This document (EN 847-3:2013) has been prepared by Technical Committee CEN/TC 142 “Woodworking
machines - Safety”, the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the
latest by April 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 847-3:2004.
The following table contains a list of modifications from the previous edition.
EN 847-3:2004 EN 847-3:2013 Reason

3 Terms 3 Terms and definitions: ed/te
new headline
some new definitions
5 Safety requirements 5 Design requirements: ed
new numbering
7 Information for use 7 Information for use; with 7.2 Safe ed
working practice
Annex A: Safe work practice No Annex A ed
New: Bibliography ed
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
This European Standard specifies general requirements for the safety of clamping devices for machine tools for
woodworking.
It is addressed to manufacturers and it is useful for end users.
1 Scope
This European Standard specifies all hazards arising from the use of clamping devices for the fastening of
milling tools and circular saw blades on woodworking machines and specifies the methods for the elimination
or reduction of these hazards by the design of the clamping device and by the provision of information.
This European Standard does not apply to arbors for spindle moulding machines in accordance with EN 848-1
or to clamping flanges for circular sawing blades to be used on circular sawing machines in accordance with
the standard series EN 1870 and does not cover hazard related to the connection of the clamping device with
the machine.
Bore mounted tools which are mounted on an interchangeable arbor should be considered as a shank
mounted tool.
NOTE For definition of "woodworking machines", see EN 847-1.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 847-1:2013, Tools for woodworking — Safety requirements — Part 1: Milling tools, circular saw blades
ISO 1940-1, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state —
Part 1: Specification and verification of balance tolerances
ISO 10897, Collets for tool holders with taper ratio 1:10 — Collets, holders, nuts
ISO 15488, Collets with 8 degree setting angle for tool shanks — Collets, nuts and fitting dimensions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 847-1:2013 and the following apply.
3.1
shank
part of the tool by which it is held
[SOURCE: ISO 3002-1:1982, 3.2.2]
3.2
shank mounted tool
tool with a shank
3.3
bore mounted tool
tool with a bore for mounting
3.4
tool bore
that bore in a tool by which it can be located and fixed by a spindle, arbour or mandrel
[SOURCE: ISO 3002-1:1982, 3.2.3]
3.5
clamping device
element for fixing the tool on the driving spindle of the woodworking machine, for transferring the torque of the
driving spindle and for positioning of the tool
3.5.1
friction lock clamping device
clamping device where the connection between tool and clamping device as well as the positioning of the tool
is achieved by friction lock fixing elements (e.g. by spring tensions, gripping elements, hydrostatic clamping
elements)
3.5.1.1
clamping device with mechanical clamping fixture
clamping device where gripping of the tool in the clamping device is performed mechanically, e.g. by spring
tension, gripping elements
3.5.1.2
clamping device with hydrostatic clamping fixture
clamping device where gripping of the tool in the clamping device is performed hydrostatically, e.g. by
hydrostatic clamping elements
3.5.1.2.1
hydrostatic clamping element
element which neutralises tolerances between the woodworking tool and the clamping device by elastic
deformation
Note 1 to entry: The deformation is generated by hydrostatic pressure.
3.5.1.2.2
open system clamping device
clamping device where the clamping medium (incompressible fluid, e.g. oil, grease) can escape when
released and is supplied from the outside when clamped
3.5.1.2.3
close system clamping device
clamping device where the clamping medium is permanently and pressure-tightly retained in the system
3.5.1.3
one piece clamping device
solid clamping device where the clamping force is generated by the elasticity of its material, e.g. shrink chuck
3.5.2
form lock clamping device
clamping device where the connection between tool and clamping device is achieved by form lock fixing
elements, e.g. bayonet type clamping, flatted cylindrical shanks
3.6
maximum rotational speed
maximum rotational speed for the operation for which the clamping device is designed
4 List of significant hazards
Table 1 shows the list of significant hazards.
Table 1 — List of significant hazards
Corresponding
Condition or causes of the hazard related
Hazard clause of
to the clamping device
EN 847-3
Incorrect assembly of the clamping device 5.6
Modification of tool position relative to the clamping 7.2
device
Ejection of parts Dynamic unbalance of the clamping device while rotating 5.4
Loosening of the tool in/on the clamping device during 7.2
machining
Fastening of the clamping device on the driving spindle 7.2
Vibrations Dynamic unbalance of the clamping device 5.4

5 Design requirements
5.1 General
Clamping devices shall be designed and made of such materials that they withstand the forces and loads
expected during operation.
Verification: By test procedure described in 5.5.3.
NOTE For the calculation of the shank strength, see EN 847-2.
In the area of the mounted surface, clamping devices shall be compatible to woodworking tools.
5.2 Hydrostatic clamping devices with open system
Hydrostatic clamping devices with open system shall be designed to retain the tool in the clamping device in
the event of the loss of pressure, e.g. by an additional mechanical locking.
Verification: By checking the relevant drawings and visual inspection of the clamping device.
5.3 Shape
The cross-section of clamping devices shall have a circular form perpendicular to the axis of rotation.
The following exceptions of the circular form are permissible:
 thread holes for fixing, balancing screws and balancing holes;
 widths across flats;
 shape and dimensions according to the sizes of the wrenches;
 balancing flats for systems with flatted tool shanks.
Verification: By checking the relevant drawings, measurement and visual inspection of the clamping device.
5.4 Balance
Clamping devices having a mass greater than 0,5 kg shall be balanced.
Clamping devices with keyways inside the bore shall be balanced without keys and clamping devices with
ke
...