Tools for woodworking - Safety requirements - Part 1: Milling tools, circular saw blades

This document specifies all hazards arising from the design of tools for woodworking machines, and describes the methods for the elimination or reduction of these hazards by tool design and by the provision of information. This document deals with milling tools (bore mounted, shank mounted, integrated spindle) and circular saw blades, but does not cover any hazard related to the strength of shank of shank mounted milling tools. The hazards are listed in Clause 5. This document does not apply to boring bits, eccentric single router cutters, cutters with cutting circle less than 16 mm and to tools used in rotary knife lathes and copying lathes where the hazard of ejection and contact with the tool is always prevented by a system of fixed guards and/or movable guards interlocked with guard-locking and/or self-closing guards.

Maschinen-Werkzeuge fur Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil 1: Fas- und Hobelwerkzeuge, Kreissageblätter

Dieses Dokument gilt für alle Gefährdungen, die aufgrund der Gestaltung von Werkzeugen für Holz-bearbeitungsmaschinen entstehen und legt die Verfahren für die Beseitigung oder Verringerung dieser Gefährdungen durch die Gestaltung des Werkzeuges und durch die Bereitstellung von Informationen fest. Dieses Dokument behandelt Fräswerkzeuge (mit Bohrung, mit Schaft), integrierte Werkzeuge und Kreissägeblätter. Dieses Dokument bezieht die Gefährdungen in Verbindung mit der Schaftfestigkeit von Fräswerkzeugen mit Schaft nicht ein. Die Gefährdungen sind in Abschnitt 5 aufgeführt. Dieses Dokument gilt nicht für Bohrer, einschneidige Schaftfräser für exzentrische Spannung, Fräser mit einem Schneidenkreis von weniger als 16 mm und für Werkzeuge in Drehmaschinen mit rotierendem Werkzeug und Kopierdrehmaschinen, bei denen einer Gefährdung durch Herausschleudern oder durch Kontakt mit dem Werkzeug stets durch ein System von feststehenden und/oder beweglichen Schutzvorrichtungen mit Zuhaltung und/oder mit selbstschließenden Schutzvorrichtungen vorgebeugt wird.

Outils pour le travail du bois - Prescriptions de sécurité - Partie 1: Outils de fraisage, lames de scies circulaires

Le présent document spécifie tous les phénomènes dangereux résultant de la conception des outils pour
machines à bois et décrit des méthodes de conception des outils ainsi que des procédures d’information
permettant d'éliminer ou de réduire ces phénomènes dangereux. Le présent document traite des outils de
fraisage (à trou, à queue et à broche), des outils intégrés et des lames de scies circulaires.
Le présent document ne couvre pas les phénomènes dangereux relatifs à la résistance de la queue des outils
de fraisage à queue. La liste des phénomènes dangereux est donnée à l'article 5. Le présent document ne
s'applique pas aux mèches à percer, aux fraises pour défonceuses à lame unique pour utilisation sur mandrin
excentrique, aux fraises ayant un diamètre de coupe inférieur à 16 mm ni aux outils utilisés sur des tours
rotatifs et des tours à copier où le risque de projection et de contact avec l'outil est toujours empêché par un
système de protecteurs fixes et/ou mobiles interverrouillés et/ou des protecteurs à fermeture automatique.

Orodja za obdelavo lesa - Varnostne zahteve - 1. del: Rezkalno orodje, listi krožnih žag

Ta evropski standard določa vse nevarnosti, ki izhajajo iz uporabe orodij za obdelavo lesa, in opisuje metode za zmanjšanje ali odpravo teh nevarnosti z zasnovo orodja in zagotavljanjem informacij. Ta evropski standard obravnava frezala (pritrjena v izvrtino, pritrjena na držalo), integrirana orodja in krožne žage. Ta evropski standard ne obravnava nobene nevarnosti, povezane z močjo držala pri frezalih, pritrjenih na držalo. Nevarnosti so navedene v točki 4. Ta evropski standard se ne uporablja za vrtalne glave, ekscentrične enojne nadrezkarje, rezkalnike s krogom rezkanja, manjšim od 16 mm, orodja, ki se uporabljajo za stružnice z rotacijskim nožem in kopirne stružnice, pri katerih se nevarnost izmeta in stika z orodjem vedno preprečuje s sistemom fiksnih varoval in/ali premičnih varoval, povezanih z blokado varovanja in/ali samozapornimi varovali.

General Information

Status
Withdrawn
Public Enquiry End Date
09-Jan-2012
Publication Date
11-Dec-2013
Withdrawal Date
08-Jan-2018
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
11-Dec-2017
Due Date
03-Jan-2018
Completion Date
09-Jan-2018

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SLOVENSKI STANDARD
SIST EN 847-1:2014
01-januar-2014
1DGRPHãþD
SIST EN 847-1:2005+A1:2007

Orodja za obdelavo lesa - Varnostne zahteve - 1. del: Rezkalno orodje, listi krožnih

žag

Tools for woodworking - Safety requirements - Part 1: Milling tools, circular saw blades

Maschinen-Werkzeuge fur Holzbearbeitung - Sicherheitstechnische Anforderungen - Teil

1: Fas- und Hobelwerkzeuge, Kreissageblätter

Outils pour le travail du bois - Prescriptions de sécurité - Partie 1: Outils de fraisage,

lames de scies circulaires
Ta slovenski standard je istoveten z: EN 847-1:2013
ICS:
25.100.20 Orodja za frezanje Milling tools
25.100.40 Žagni listi Saws
79.120.10 Lesnoobdelovalni stroji Woodworking machines
SIST EN 847-1:2014 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 847-1:2014
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SIST EN 847-1:2014
EUROPEAN STANDARD
EN 847-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2013
ICS 79.120.10 Supersedes EN 847-1:2005+A1:2007
English Version
Tools for woodworking - Safety requirements - Part 1: Milling
tools, circular saw blades

Outils pour le travail du bois - Prescriptions de sécurité - Maschinen-Werkzeuge für Holzbearbeitung -

Partie 1: Outils de fraisage, lames de scies circulaires Sicherheitstechnische Anforderungen - Teil 1: Fräs- und

Hobelwerkzeuge, Kreissägeblätter
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 847-1:2013: E

worldwide for CEN national Members.
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SIST EN 847-1:2014
EN 847-1:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................6

2 Normative references ............................................................................................................................6

3 Terms, definitions, symbols and abbreviations .................................................................................6

3.1 Terms and definitions ...........................................................................................................................6

3.2 Symbols and abbreviations ............................................................................................................... 12

4 List of significant hazards ................................................................................................................. 14

5 Design requirements .......................................................................................................................... 15

5.1 General requirements for milling tools and circular saw blades ................................................... 15

5.1.1 General ................................................................................................................................................. 15

5.1.2 Safety requirements and/or measures ............................................................................................. 15

5.1.3 Separable fixing .................................................................................................................................. 16

5.1.4 Overspeed type test for complex tools ............................................................................................ 17

5.1.5 Cutting blade thickness and cutting blade projection .................................................................... 18

5.1.6 Dimensions and tolerances ............................................................................................................... 19

5.1.7 Handling of detachable tools with m > 15 kg ................................................................................... 20

5.2 Specific requirements for milling tools ............................................................................................ 20

5.2.1 Tools for hand fed machines ............................................................................................................. 20

5.2.2 Prevention of relative rotation within a tool combination .............................................................. 26

5.2.3 Balance of milling tools ..................................................................................................................... 26

6 Tool identification ............................................................................................................................... 28

6.1 Marking of milling tools for integrated feed other than shank mounted tools or integrated

tools ..................................................................................................................................................... 28

6.2 Marking of milling tools for machines with hand feed other than shank mounted tools or

integrated tools ................................................................................................................................... 28

6.3 Marking of integrated tools ................................................................................................................ 28

6.4 Marking of shank mounted tools ...................................................................................................... 29

6.5 Marking of circular saw blades ......................................................................................................... 29

6.6 Marking of cutting parts and deflectors ........................................................................................... 30

7 Information for use ............................................................................................................................. 30

7.1 General ................................................................................................................................................. 30

7.2 Safe working practice ......................................................................................................................... 30

7.2.1 Maximum speed .................................................................................................................................. 30

7.2.2 Circular saw blades ............................................................................................................................ 30

7.2.3 One piece tools ................................................................................................................................... 30

7.2.4 Cleaning ............................................................................................................................................... 30

7.2.5 Mounting and fastening of tools and tool parts .............................................................................. 31

7.3 Maintenance of tools .......................................................................................................................... 31

7.4 Handling ............................................................................................................................................... 32

Annex A (informative) Maintenance and modification of milling tools and related components ............ 33

A.1 General ................................................................................................................................................. 33

A.2 Minimum dimensions ......................................................................................................................... 33

A.3 Retipping, exchange of tips on composite tools and circular saw blades ................................... 33

A.4 Milling tools marked with MAN .......................................................................................................... 33

A.5 Balance of milling tools ..................................................................................................................... 33

A.6 Marking ................................................................................................................................................ 33

A.7 Information .......................................................................................................................................... 33

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SIST EN 847-1:2014
EN 847-1:2013 (E)

Annex B (normative) Palmqvist Toughness Test .......................................................................................... 34

Bibliography ...................................................................................................................................................... 35

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SIST EN 847-1:2014
EN 847-1:2013 (E)
Foreword

This document (EN 847-1:2013) 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 847-1:2005+A1:2007.
The following table contains a list of modifications from the previous edition.
EN 847-1:2013 Reason
EN 847-1:2005+A1:2007
3 Terms 3 Terms and definitions editorial (ed)
4 Symbols and abbreviations 3.2 Symbols and abbreviations ed
5 List of significant hazards 4 List of significant hazards ed
6 Design requirements 5 Design requirements ed
6.2.3.2.2 Balance quality requirements 5.2.3.2 Balance quality requirements ed
Table 4 (5): 3 columns Table 5: 4 columns Precision of
requirements (te)
New Table 6: Quantities and units ed
7 Tool identification 6 Tool identification ed
8 Information for use 7 Information for use ed
Annex A: Safe work practice 7.2 Safe working practice ed
Annex B: Maintenance and modification Annex A: Maintenance and modification ed
of milling tools and related components of milling tools and related components
Annex C: Palmqvist toughness test Annex B: Palmqvist toughness test 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.

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SIST EN 847-1:2014
EN 847-1:2013 (E)
Introduction

The extent to which hazards are covered is indicated in the Scope of this document.

The requirements of this document concern designers, manufacturers, suppliers and importers of tools for

woodworking.

This document also includes information which the manufacturer will provide to the user.

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SIST EN 847-1:2014
EN 847-1:2013 (E)
1 Scope

This European Standard specifies all hazards arising from the use of tools for woodworking machines, and

describes the methods for the elimination or reduction of these hazards by tool design and by the provision of

information. This European Standard deals with milling tools (bore mounted, shank mounted), integrated tools

and circular saw blades.

This European Standard does not cover any hazard related to the strength of shank of shank mounted milling

tools. The hazards are listed in Clause 4. This European Standard does not apply to boring bits, eccentric

single router cutters, cutters with cutting circle less than 16 mm and to tools used in rotary knife lathes and

copying lathes where the hazard of ejection and contact with the tool is always prevented by a system of fixed

guards and/or movable guards interlocked with guard-locking and/or self-closing guards.

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 847-2, Tools for woodworking — Safety requirements — Part 2: Requirements for the shank of shank

mounted milling
EN 23878, Hardmetals — Vickers hardness test (ISO 3878)

ISO 286-2, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —

Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts

ISO 1940-1, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state —

Part 1: Specification and verification of balance tolerances
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
milling tools

rotating cutting tool (e.g. milling cutter, planing cutter, thicknessing cutter) normally having its main feed

direction perpendicular to the rotation axis, for working various surfaces on wood and similar materials through

chip removal
Note 1 to entry: The cutting edge of the cutting part may be
 parallel to the axis of rotation,
 square to the axis of rotation, or
 a profile which is a combination of the two.
The tool may be
 a one piece tool,
 a composite tool,
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SIST EN 847-1:2014
EN 847-1:2013 (E)
 a complex tool, or
 in the form of a tool set.
3.1.2
circular saw blade

rotating cutting tool for cross-cutting or ripping wood and similar materials through chip removal

Note 1 to entry: The tools cut on the periphery and on both flanks simultaneously, and may be

 a one piece tool,
 a composite tool, or
 a complex tool.
3.1.3
one piece tool (solid tool)

tools without bonded or detachable parts: the body and the cutting parts are one piece

3.1.4
composite tool (tipped tool)

tools where the cutting parts (tips) are firmly connected by bonding to the body, e.g. welding, brazing,

adhesive fixing
3.1.5
complex tool

tools where one or more cutting parts (inserts, blades) are exchangeably mounted in a body through

detachable fixing elements
Note 1 to entry: The cutting parts may be one piece or composite.
3.1.6
tool set

number of individual tools clamped together on a tool carrier designed to function as one tool

3.1.7
integrated tools

tools where the body is part of the machine and only the cutting parts are exchangeable

3.1.8
body

part of the tool which holds the cutting blades or inserts, or on which the cutting parts are formed

[SOURCE: ISO 3002-1:1982, 3.2.1]
3.1.9
cutting part
functional part or parts of the tool each comprised of chip producing elements

Note 1 to entry: The cutting edges, face and flank are therefore elements of the cutting part. In the case of a multi-

toothed cutter, each tooth has a cutting part.
[SOURCE: ISO 3002-1:1982, 3.2.5]
3.1.10
auxiliary cutting parts

auxiliary cutting parts are additional cutting parts with a cutting width of less than or equal to 12 mm and a

radial cutting edge projection to the body of less than or equal to 13 mm
EXAMPLE Grooving inserts, bevelling inserts, chamfering inserts.
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SIST EN 847-1:2014
EN 847-1:2013 (E)
3.1.11
spur
cutting part which operates both on its periphery and on its flank

Note 1 to entry: The spur projects from the major cutting edge in radial, and if applicable, in axial direction. A spur is

either a separate cutting part (see Figure 1) or a part of the major cutting edge.

Dimensions in millimetres
Key
1 screw at the choice of the manufacturer
Figure 1 — Milling tool with a spur
3.1.12
cutting diameter
d (cutting radius r )
1 1

for tools where various blades can be mounted, the cutting diameter d (cutting radius r ) is the maximum

1 1
possible value
Note 1 to entry: See Figure 2.
Shaded area (see 5.2.1.2)
Figure 2 — Cutting diameter and cutting width
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SIST EN 847-1:2014
EN 847-1:2013 (E)
3.1.13
cutting width

for tools where various blades can be mounted, the cutting width b is the maximum possible value

Note 1 to entry: See Figure 2.
3.1.14
deflector

projecting part exchangeably mounted or firmly connected by bonding to the body or part of the body which

performs chip thickness limitation
Note 1 to entry: The deflector can also be called a "counter-knife".
Note 2 to entry: See Figures 3 b), c), d), e) and g).
3.1.15
cutting blade projection

difference between the radius r of the cutting circle and the radius r of the back supporting circle where

1 5
t = r – r
1 5
Note 1 to entry: See Figure 3.
3.1.16
radial cutting edge projection

difference between the deflector (not round form tools) or the body (round form tools) and the cutting edge

measured in the direction of the normal to the profile
Note 1 to entry: See Figures 2 and 3.
3.1.17
axial cutting edge projection

distance measured axially between the axial cutting edge and the body or the deflector

Note 1 to entry: See Figure 3 a) and Figure 3 d).
3.1.18
round form tool

tool where the body has a circular shape in any cross section perpendicular to the rotational axis of the tool

and which performs chip thickness limitation

Note 1 to entry: Auxiliary cutting parts with a deflector or spurs (see 3.1.10 and 3.1.11) are not considered.

Note 2 to entry: See Figures 3 a) and 5.
3.1.19
not round form tool

tool where chip thickness limitation is performed by a deflector (see Figures 3 b), c), d), e) and g)) or where a

cross section of the body is not circular
Note 1 to entry: See Figure 3 f).
3.1.20
round form tool set

functional unit consisting of a number of individual not round form and/or round form tools clamped together

and forming a round form tool shape with radial gaps of less than 5 mm and axial gaps less than 15 mm and

the top and the bottom side is a full round
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SIST EN 847-1:2014
EN 847-1:2013 (E)
3.1.21
tool combination

unit consisting of a number of loose tools connectable in a variable sequence or extendable in a variable

position
3.1.22
non-separable fixing

bonding of the tool components to the body which prevents their change of position relative to each other

3.1.23
separable fixing

fixing of the tool components to the body which allows their change of position relative to each other

3.1.23.1
friction lock fixing

fixing where the relative change of position in a radial direction during rotation is prevented only by the friction

forces
Note 1 to entry: See Figure 4.
3.1.23.2
form lock fixing

fixing where the relative change of position in the radial direction during rotation is prevented by the form and

arrangement of the components
Note 1 to entry: See Figure 5.
3.1.24
radial and axial approach flats

flat on the radial and/or axial surface of the deflector or of the body, in front of the deflector edge

Note 1 to entry: See Figure 6.
3.1.25
radial approach angle

angle between the approach flat and the tangent to the deflector circle at the deflector edge or to the body

circle at the point where the radial approach flat begins
Note 1 to entry: See Figure 6.
3.1.26
axial approach angle

angle between a plane perpendicular to the axis of the tool and the axial approach flat

Note 1 to entry: See Figure 6.
3.1.27
basic number of teeth
number of teeth cutting in each part of the profile
3.1.28
woodworking machine

machine or a combination of machines intended for machining of wood and similar materials (see 3.1.29) by

chip removal, or chipless cutting, sanding and forming, laminating (including gluing and edging) or joining

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SIST EN 847-1:2014
EN 847-1:2013 (E)
3.1.29
similar materials

materials with physical and technological characteristics similar to those of wood, such as cork, bone, plastics,

light alloys, wood based materials as chipboard, fibreboard, plywood, etc. and for which the process for

machining and chip or particle removal is similar
3.1.30
tools

all individual tools and tool sets for the mechanical removal of chips e.g. circular saw blades, bandsaw blades,

milling cutters, chain cutters. Tools also include devices for forming and shaping or chipless cutting

3.1.31
hand feed

manual holding and/or guiding of the workpiece or of a machine element incorporating a tool

Note 1 to entry: Hand feed includes the use of hand-operated carriage on which the workpiece is placed manually or

clamped and the use of demountable power feed unit (see 3.1.36).
3.1.32
integrated feed

feed mechanism for the workpiece or tool which is integrated with the machine and where the workpiece or

machine element with incorporated tool is held and controlled mechanically during the machining operation

3.1.33
maximum rotational speed
maximum rotational speed for the operation for which the tool is designed
3.1.34
speed range

minimum and maximum rotational speeds within which the tool spindle or tool is designed to operate

3.1.35
loading the machine

manual or automatic placing of the workpiece onto a carriage, magazine, lift, hopper, movable bed, conveyor

or the presentation of the workpiece to an integrated feed device
3.1.36
demountable power feed unit

feed mechanism which is mounted on the machine so that it can be moved from the working position without

the use of a spanner or similar additional device
3.1.37
ejection

uncontrolled movement of the workpiece, parts of it, parts of machines or uncontrolled movement of hand-held

machines during processing
3.1.38
kickback

particular form of ejection (see 3.1.37) describing the uncontrolled movement of the workpiece or parts of it

opposite to the direction of feed during processing
3.1.39
chip breaking item

characteristic feature suitable to deflect the chip (e.g. to upset the chip) with the aim of reducing the

presplitting of the workpiece material

Note 1 to entry: The chip breaking item may be a separate or an integral element of the cutting part.

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SIST EN 847-1:2014
EN 847-1:2013 (E)
3.1.40
gullet width

tangential distance from the cutting edge to the point at which the contour of the tool abandons the circle with

radius r
Note 1 to entry: See Figure 3 a) and Figure 3 g).
3.2 Symbols and abbreviations
SP Alloyed tool steel (minimum 0,6 % C and no more than 5 % alloy constituents)
HL High alloyed tool steel (more than 5 % alloy units, e.g. 12 % Cr)
HS High speed steel (more than 12 % total of alloying components W, Mo, V, Co)
HW Uncoated hardmetal on tungsten carbide base [ISO 513:2012]
HC Coated hardmetal [ISO 513:2012]
ST Cast cobalt-based alloys, e.g. Stellites
DP Polycrystalline diamond [ISO 513:2012]
DM Monocrystalline diamond
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SIST EN 847-1:2014
EN 847-1:2013 (E)
In Figure 3 a) is r = r .
2 5
Figure 3 — Deflector
Figure 4 — Friction lock fixing
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SIST EN 847-1:2014
EN 847-1:2013 (E)
Figure 5 — Form lock fixing
Key
1 radial approach flat
2 axial approach flat
Figure 6 — Radial and axial approach flats
4 List of significant hazards
Table 1 shows the list of significant hazards.
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SIST EN 847-1:2014
EN 847-1:2013 (E)
Table 1 — Significant hazards
Hazard Condition or causes of hazard Corresponding clause
related to the tool of EN 847-1
Cutting and severing cutting hazard when mounting or 5.1.7, Clause 7
dismounting the tool
kickback or contact with the 5.2
rotating tool

Ejection of parts disintegration or partial break up to 5.1.2, 5.1.4, 5.1.5.2, 5.1.5.3, 5.2.2,

tool body 6.1, 6.2, 6.3, 6.4, 6.5, 7.2.1, 7.2.2,
7.2.3, 7.2.4, 7.3
incorrect assembly of tool 5.1.3, 5.1.5, 7.2.4, 7.3.3
components
movements of blades fixed by 5.1.3
friction
fly in/out of blades or separate 5.1.3, 5.1.4, 5.1.5.2, 5.1.5.3
components
unbalance of the tool while rotating 5.1.6.1, 5.2.3
kickback when machining 5.1.4.2, 5.2, 5.2.1
fixing of the tool on the machine 5.1.6.2, 7.3
spindle
modification of position of tool 5.2.2, 7.3.5
components
Vibrations unbalance of tool 5.1.6.1, 5.2.3
5 Design requirements
5.1 General requirements for milling tools and circular saw blades
5.1.1 General

Tools shall be designed and made of such materials in order that they will withstand the forces and loads

expected when used and maintained in compliance with the manufacturer's instructions.

5.1.2 Safety requirements and/or measures

One piece (solid), composite and complex tools shall be designed with a safety factor as given in Table 2.

Table 2 — Safety factors
Type of tool Method of procedure Safety factor
One piece (solid) Calculation of stresses or Safety factor of 4 means
and composite tools centrifugal test against fracture n = 2 × n
p max
Complex tools Test procedure Safety factor of 2,25 means
described under 5.1.4
n = 1,5 × n
p max
NOTE n is the test speed for overspeed test.
An overspeed type test is required for complex tools (see 5.1.4).
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SIST EN 847-1:2014
EN 847-1:2013 (E)

For tools with a cutting radius of r ≤ 20 mm a load of 50 N/mm shall be assumed. For tools with a cutting radius

of r > 20 mm the following formula applies for the calculation of the cutting force per millimetre:

30 ⋅ P
Mot 6
F = ⋅ 10 (1)
r ⋅ b ⋅ n ⋅ π
1 1 max
where
F is the specific cutting force [N/mm];
P is the spindle motor power [kW];
Mot
r is the cutting radius [mm];
b is the cutting width [mm];
n is the maximum rotational speed [min ].
max

Verification: By checking calculations or using the test procedure described in 5.1.4.

5.1.3 Separable fixing
5.1.3.1 Form lock fixing and friction lock fixing

Form lock fixing shall be used for complex tools with the exception of the following cases where friction lock

fixing may also be used:

 cutting blades used in milling tools for surface planing and thicknessing machines whose cutting width is

at least 150 mm;

 cutting blades (except moulding and bevel blades) used in milling tools for machines with integrated feed;

 tools used in chipping and flaking machines with integrated feed.

Verification: By checking relevant drawings, measurement and visual inspection of the tool.

5.1.3.2 Clamping parts

The design of a complex tool, which includes a deflector, shall ensure that clamping of the knife can only be

achieved with the deflector in position.

Form lock fixing shall ensure a positive mechanical fastening between the separable tool elements, and shall not

rely on friction alone between the clamped parts. Examples of positive mechanical locks are: pin(s), screw(s),

slots, notches.

Where a pin lock is used, at least 1 pin per blade (see Figure 7) shall be used for cutting blade widths up to

30 mm and at least 2 pins per blade for cutting blade width over 30 mm.
Figure 7 — Complex tool pin locking
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SIST EN 847-1:2014
EN 847-1:2013 (E)

For planing and combined planing and thicknessing machine milling tools, where fixing of the wedges is by

means of screws (see Figures 4 b) and 5 b)), at least two screws are required for each wedge.

...

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