EN 1218-3:2001

SLOVENSKI STANDARD
01-november-2002
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Safety of woodworking machines - Tenoning machines - Part 3: Hand fed tenoning
machines with sliding table for cutting structural timbers
Sicherheit von Holzbearbeitungsmaschinen - Zapfenschneid- und Schlitzmaschinen -
Teil 3: Abbundmaschinen mit von Hand bewegtem Schiebetisch
Sécurité des machines a bois - Tenonneuses - Partie 3: Machines a avance manuelle et
a table roulante pour la coupe des éléments de charpente de toit en bois
Ta slovenski standard je istoveten z: EN 1218-3:2001
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 1218-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 79.120.10
English version
Safety of woodworking machines - Tenoning machines - Part 3:
Hand fed tenoning machines with sliding table for cutting
structural timbers
Sécurité des machines à bois - Tenonneuses - Partie 3: Sicherheit von Holzbearbeitungsmaschinen -
Machines à avance manuelle et à table roulante pour la Zapfenschneid- und Schlitzmaschinen - Teil 3:
coupe des éléments de charpente de toit en bois Abbundmaschinen mit von Hand bewegtem Schiebetisch
This European Standard was approved by CEN on 30 September 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1218-3:2001 E
worldwide for CEN national Members.

Contents
Foreword.3
0 Introduction .4
1 Scope .4
2 Normative references .4
3 Terms and definitions.6
3.1 Terms .6
3.2 Definitions.6
4 List of hazards.9
5 Safety requirements and/or measures .11
5.1 Controls .11
5.2 Protection against mechanical hazards .14
5.3 Protection against non-mechanical hazards .23
6 Information for use .26
6.1 Warning devices.26
6.2 Marking .26
6.3 Instruction handbook .26
Annex A (normative)  Transportable machine stability test .28
A.1 Tilting Test.28
A.2 Displacement test .28
Annex B (normative)  Saw spindle dimensional tolerances .30
Annex C (normative) Riving knife lateral stability test.31
Annex D (normative) Operating conditions for noise emission measurement .32
D.1 General.32
D.2 Noise measurements.32
Annex E (informative) Safe working practice .37
E.1 General.37
E.2 Sawblades.37
E.3 Workpiece.38
E.4 Sliding table.38
E.5 Noise .38
E.6 Dust .38
Annex ZA (informative) Relationship of this document with EC Directives.39
Bibliography .40
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 142 "Woodworking machines -
Safety", the secretariat of which is held by BSI.
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 2002, and conflicting national standards shall be withdrawn at the latest by
April 2002.
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 EC Directive(s).
For relationship with EC Directive(s), see informative annex ZA, which is an integral part of this document.
Organisations contributing to the preparation of this European Standard include European Committee of
Woodworking Machinery Manufacturers Association "EUMABOIS".
The annexes A, B, C and D are normative and annexes E and ZA are informative.
This standard includes a Bibliography.
The European Standards produced by CEN/TC 142 are particular to woodworking machines and complement the
relevant A and B Standards on the subject of general safety (see introduction of EN 292-1 : 1991 for a description
of A, B and C standards).
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
0 Introduction
This European Standard has been prepared to be a harmonised standard to provide one means of conforming to
the essential safety requirements of the Machinery Directive, and associated EFTA regulations. This European
Standard is a type "C“ standard as defined in EN 292-1 : 1991.
The extent to which hazards are covered is indicated in the scope of this European Standard.
The requirements of this European Standard concern designers, manufacturers, suppliers and importers of hand
fed tenoning machines with sliding table for cutting structural timbers.
This European Standard also includes information to be provided by the manufacturer to the user.
Common requirements for tooling are given in EN 847-1 : 1997.
1 Scope
This European Standard sets out the requirements and/or the measures to remove the hazards and limit the risks
on hand fed tenoning machines with sliding table for cutting structural timbers, hereinafter referred to as
"machines".
This European Standard does not apply to :

machines where the tenon is produced by means of milling tools;
-1

machines designed for a tool spindle speed exceeding 6000 min ;

machines where the cuts are made on both ends of the workpiece during one cycle;

combined machines used for tenoning (see EN 940 : 1997);

the tenoning attachment on a vertical spindle moulding machine (see EN 848-1 : 1998).
This European Standard covers the hazards relevant to this machine as listed in clause 4.
For Computer Numerically Controlled (CNC) machines this European Standard does not cover hazards related to
Electro-Magnetic Compatibility (EMC).
This European Standard is primarily directed to machines which are manufactured after the date of issue of this
European Standard.
2 Normative references
This European Standard incorporates by dated or undated reference provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 292-1 : 1991 Safety of machinery - Basic concepts, general principles for design - Part 1 :
Basic terminology and methodology.
EN 292-2 : 1991 Safety of machinery - Basic concepts, general principles for design - Part 2 :
EN 292-2/A1 : 1995 Technical principles and specifications.
EN 418 : 1992 Safety of machines - Emergency stop equipment - Functional aspects –
Principles for design.
EN 847-1 : 1997 Tools for woodworking - Safety requirements – Part 1 : Milling tools and circular
sawblades.
EN 954-1 : 1996 Safety of machinery - Safety related parts of control systems - Part 1 : General
principles for design.
EN 982 : 1996 Safety requirements for fluid power systems and components – Hydraulics.
EN 983 : 1996 Safety requirements for fluid power systems and components – Pneumatics.
EN 1088 : 1995 Safety of machinery - Interlocking devices associated with guards – Principles
for design and selection.
EN 60204-1 : 1992 Safety of machinery - Electrical equipment of machines - Part 1 : General
requirements (IEC 204-1 : 1992, modified).
EN 60529 : 1991 Degree of protection provided by enclosures (IP code) (IEC 60529 : 1989).
EN 60825-1 : 1994 Safety of laser products - Part 1 : Equipment classification, requirements and
users guide (IEC 60825-1 : 1993).
EN 60947-4-1 : 1992 Low voltage switchgear and control gear - Part 4 : Contactors and motor starters
- Section 1 : Electromechanical contactors and motor starters
(IEC 60947-4-1 : 1990).
EN 60947-5-1 : 1997 Low voltage switchgear and control gear - Part 5 : Control circuit devices and
switching elements – Section 1 : Electromechanical control circuit devices
(IEC 60947-5-1 : 1997).
EN ISO 3743-1 : 1995 Acoustics – Determination of sound power levels of noise sources - Engineering
methods for small, moveable sources in reverberant fields - Part 1 : Comparison
method for hard wall test rooms (ISO 3743-1 : 1994).
EN ISO 3743-2 : 1996 Acoustics - Determination of sound power levels of noise sources - Engineering
methods for small, moveable sources in reverberant fields - Part 2 : Method for
special reverberation test rooms (ISO 3743-2 : 1994).
EN ISO 3744 : 1995 Acoustics - Determination of sound power levels of noise sources using sound
pressure engineering methods in an essentially free field over a reflecting plane
(ISO 3744 : 1994).
EN ISO 3746 : 1995 Acoustics – Determination of sound power levels of noise sources using sound
pressure – Survey method employing an enveloping measurement surface over
a reflecting plane (ISO 3746 : 1995).
EN ISO 4871 : 1996 Acoustics – Determination and verification of noise emission values of
machinery and equipment (ISO 4871 : 1996).
EN ISO 9614-1 : 1995 Acoustics - Determination of sound power levels of noise sources using sound
intensity - Part 1 : Measurement at discrete points (ISO 9614-1 : 1993).
EN ISO 11202 : 1995 Acoustics - Noise emitted by machinery and equipment – Measurement method
of emission sound pressure levels at the workstation and at other specified
positions survey method in situ (ISO 11202 : 1995).
EN ISO 11204 : 1995 Acoustics - Noise emitted by machinery and equipment - Measurement of
emission sound pressure levels at the workstation and at other specified
positions - Method requiring environmental corrections (ISO 11204 : 1995).
EN ISO 11688-1 : 1998 Acoustics - Recommended practice for the design of low noise machinery and
equipment - Part 1 : Planning (ISO/TR 11688-1 : 1995).
ISO 286-2 : 1988 ISO system of limits and fits - Part 2 : Tables of standard tolerance grades and
limit deviations for holes and shafts.
ISO 3745 : 1977 Acoustics - Determination of sound power levels of noise sources - Precision
methods for anechoic and semi-anechoic rooms.
HD 21.1 S3 : 1997 Polyvinyl chloride insulated cables of rated voltages up to and including
450/750v - Part 1 : General requirements.
HD 22.1 S3 : 1997 Rubber insulated cables of rated voltages up to and including 450/750v - Part 1
: General requirements.
HD 22.4 S3 : 1995 Rubber insulated cables of rated voltages up to and including 450/750 V - Part 4
+ A1 : 1999 : Cords and flexible cables (IEC 60245-4 : 1994, modified).
3 Terms and definitions
For the purposes of this European Standard the following terms and definitions apply.
3.1 Terms
The main parts of the machine and their terminology are illustrated in Figure 1.
Key 1 Main sawblade
2 Horizontal sawblades
3 Vertical sawblades
4 Controls
5 Sliding table guide
6 Sliding table
7 Workpiece clamping bridge
NOTE This figure is intended only to illustrate terms. For clarity not all necessary guards are shown
Figure 1 — Terminology
3.2 Definitions
3.2.1
hand fed tenoning machine with sliding table for cutting structural timbers
machine designed for the production of cuts, for jointing structural timbers, on one end of a workpiece during one
cycle. The cuts are made by means of sawblade(s) mounted on one or more spindles (see Figure 1)
3.2.2
cuts for jointing structural timber
machined projections including tenons on the end of a workpiece to facilitate the joining of workpieces (see Figure
2)
Figure 2 — Examples of saw cuts for joining structural timber
3.2.3
hand feed
manual holding and/or manual guiding of the workpiece (or of a machine element incorporating a tool). Hand feed
includes the use of a hand operated carriage on which the workpiece is placed manually or clamped (and the use
of a demountable power feed unit)
NOTE The words in brackets are not applicable to this machine.
3.2.4
ejection
unexpected movement of the workpiece, parts of it or part of the machine from the machine during processing
3.2.5
run-up time
time elapsed from the actuation of the start control device until the spindle reaches the intended speed
3.2.6
run-down time
time elapsed from the actuation of the stop control device up to spindle standstill
3.2.7
transportable machine
machine, which is located on the floor, stationary during use and equipped with a device, normally wheels, which
allow it to be moved between locations
3.2.8
cutting against the feed
when the relative direction of the tool to the workpiece is as illustrated in Figure 3
Key 1 Fixed sawblade
2 Sawblade
3Workpiece
4 Fixed workpiece
5 Feed direction
Figure 3 — Rotational direction of the tool relative to the workpiece feed during cutting against the feed
3.2.9
climb cutting
when the relative direction of the tool to the workpiece is as illustrated in Figure 4
Key 1 Fixed sawblade
2 Sawblade
3Workpiece
4 Fixed workpiece
5 Feed direction
Figure 4 — Rotational direction of the tool relative to the workpiece feed during climb cutting
3.2.10
machine actuator
power mechanism used to effect motion of the machine
3.2.11
confirmation
statements, sales literature, leaflets or other, where a manufacturer (supplier) declares either the characteristics of
e.g. a material or product or the compliance of the material or product to a relevant standard
4 List of hazards
This European Standard deals with hazards listed and relevant to the machines as defined in the scope :

for significant hazards by defining safety requirements and/or measures or by reference to relevant type B
standards;

for hazards which are not significant e.g. general, minor or secondary hazards by reference to relevant type
A or B standards, especially EN 292-1 : 1991 and EN 292-2 : 1991/A1 : 1995.
These hazards are listed in Table 1 in accordance with annex A of EN 292-2 : 1991/A1 : 1995.
Table 1 — List of hazards
Number Hazard Relevant subclause of this
European Standard
1 Mechanical hazards (caused for example by :
- shape
- relative location
- mass and stability (potential energy of elements)
- mass and velocity (kinetic energy of elements)
- inadequacy of the mechanical strength.
Accumulation of Potential energy by :
- elastic elements (springs), or
- liquids or gases under pressure, or
- vacuum.
of the machine parts or workpieces)
1.1 Crushing hazard 5.2.1, 5.2.7, 5.2.8
1.2 Shearing hazard 5.2.7, 5.2.8
1.3 Cutting or severing hazard 5.2.2, 5.2.3, 5.2.4, 5.2.7,
5.2.8
1.4 Entanglement hazard 5.2.3, 5.2.4, 5.2.6, 5.2.7
1.5 Drawing-in or trapping hazard 5.2.7, 5.2.8
1.6 Impact hazard Not relevant
1.7 Stabbing or puncture hazard Not relevant
1.8 Friction or abrasion hazard Not relevant
1.9 High pressure fluid injection hazard 5.3.7, 5.3.8
1.10 Ejection of parts (of machinery and processed 5.2.2, 5.2.3, 5.2.5, 5.2.6,
materials/workpieces) 5.2.8
1.11 Loss of stability (of machinery and machine parts) 5.2.1
1.12 Slip, trip and fall hazards in relationship with machinery (because of Not relevant
their mechanical nature)
2 Electrical hazards, caused for example by :
2.1 Electrical contact (direct or indirect) 5.3.4, 5.3.16, 5.3.17
2.2 Electrostatic phenomena Not relevant
2.3 Thermal radiation or other phenomena such as ejection of molten Not relevant
particles, and chemical effects from short circuits, overloads, etc.
2.4 External influences on electrical equipment 5.1.1, 5.3.4, 5.3.12
3 Thermal hazards, resulting in :
3.1 Burns and scalds, by a possible contact of persons, by flames or Not relevant
explosions and also by the radiation of heat sources
3.2 Health damaging effects by hot or cold work environment Not relevant
4 Hazards generated by noise, resulting in :
4.1 hearing losses (deafness), other physiological disorders (e.g. loss 5.3.2
of balance, loss of awareness)
4.2 interference with speech communication, acoustic signals, etc. 5.3.2
5 Hazards generated by vibration (resulting in a variety of Not relevant
neurological and vascular disorders)
6 Hazards generated by radiation, especially by :
6.1 electrical arcs Not relevant
6.2 Lasers 5.3.13, 6.3
6.3 Ionising radiation sources Not relevant
6.4 Machines making use of high frequency electro magnetic fields Not relevant
(continued)
Table 1 — List of hazards (concluded)
Number Hazard Relevant subclause of this
European Standard
7 Hazards generated by materials and substances processed, used
or exhausted by machinery for example :
7.1 Hazards resulting from contact with or inhalation of harmful fluids, 5.3.3
gases, mists, fumes and dusts
7.2 fire and explosion hazard 5.3.1, 5.3.3, Annex E
7.3 Biological and microbiological (viral or bacterial) hazards Not relevant
8 Hazards generated by neglecting ergonomic principles in machine
design (mismatch of machinery with human characteristics and
abilities) caused for example by :
8.1 unhealthy postures or excessive efforts 5.1.2, 6.3
8.2 inadequate consideration of human hand/arm or foot/leg anatomy 5.1.2, 6.3
8.3 neglected use of personal protection equipment 6.3
8.4 inadequate area lighting Annex E
8.5 mental overload or underload, stress, etc. Not relevant
8.6 human error 6.3
9 Hazard combinations Not relevant
10 Hazards caused by failure of energy supply, breaking down of
machinery parts and other functional disorders, for example :
10.1 failure of energy supply (of energy and/or control circuits) 5.1.6, 5.2.5
10.2 unexpected ejection of machine parts or fluids 5.3.16
10.3 failure, malfunction of control system (unexpected start-up, 5.1.1
unexpected overrun).
10.4 errors of fitting 5.2.3, 6.3
10.5 overturn, unexpected loss of machine stability 5.2.1
11 Hazards caused by (temporary) missing and/or incorrectly
positioned safety related measures/means, for example :
11.1 all kinds of guards 5.2.7
11.2 all kinds of safety related (protection) devices 5.1.1, 5.2.7
11.3 starting and stopping devices 5.1.2, 5.1.3, 5.1.4
11.4 safety signs and signals 6.2
11.5 all kinds of information or warning devices 6.2, 6.3
11.6 energy supply disconnecting devices 5.3.16
11.7 emergency devices 5.1.5
11.8 feeding/removal means for workpieces 5.2.5, 5.2.6
11.9 essential equipment and accessories for safe adjusting and/or 5.3.17
maintaining
11.10 equipment evacuating gases, etc. 5.3.3, 6.3
5 Safety requirements and/or measures
For guidance in connection with risk reduction by design, see clause 3 of EN 292-2 : 1991/A1 : 1995 and in
addition :
5.1 Controls
5.1.1 Safety and reliability of control systems
For the purposes of this European Standard a safety related control system is one from and including the initial
manual control or position detector to the point of input to the final actuator or element e.g. motor. The safety
related control systems of this machine (see EN 954-1 : 1996) are those for :

starting (see 5.1.3);

normal stopping (see 5.1.4);

emergency stop (see 5.1.5);

the braking system (see 5.2.4);

interlocking (see 5.2.7);

interlocking with guard locking (see 5.2.7);

powered clamping (where provided) (see 5.2.8).
Unless otherwise stated in this European Standard these control systems shall, as a minimum, be designed and
constructed in accordance with category 1 as defined in EN 954-1 : 1996.
For the purposes of this European Standard "well tried components and principles" means :
a) electrical components if they comply with relevant standards including the following as :
1) EN 60947-5-1 : 1997 (section 3) for control switches with positive opening operation used as
mechanical actuated position detectors for interlocking guards and for relays used in auxiliary circuits;
2) EN 60947-4-1 : 1992 for electromechanical contactors and motor-starters used in main circuits;
3) HD 22.1 S3 : 1997 for rubber-insulated cables;
4) HD 21.1 S3 : 1997 for polyvinyl chloride cable if this cable is additionally protected against mechanical
damage by positioning (e.g. inside frames).
b) electrical principles if they comply with the first four measures listed in 9.4.2.1 of EN 60204-1: 1992. The
circuits shall be either “hardwired”, or if electronic components are used in safety related control systems
“well tried” is fulfilled if they are in accordance with 9.4.2.2 (i.e. redundancy with cross-monitoring) or
9.4.2.3 (i.e. diversity) of EN 60204-1: 1992;
c) mechanical components if, for example they operate in the positive mode in accordance with the
description given in 3.5 of EN 292-2 : 1991/A1 : 1995;
d) mechanically actuated position detectors for guards if they are actuated in the positive mode and their
arrangement/fastening and the cam design/mounting comply with 5.2 and 5.3 of EN 1088 : 1995;
e) interlocking devices with guard locking if they satisfy the requirements of 5.2.7.1;
f) pneumatic and hydraulic components and systems if they comply with EN 983 : 1996 and EN 982 : 1996
respectively.
Time delay devices used in hardwired safety related control circuits may be of category B in accordance with the
requirements of EN 954-1 : 1996 if the time delay device is designed for at least one million actuations.
Verification : By checking the relevant drawings and/or circuit diagrams and inspection on the machine. For
electrical components by requiring confirmation from the manufacturer of the component which declares conformity
with the relevant standards.
5.1.2 Position of controls
The main control devices of the machine for starting the saw spindles and normal stopping shall be located at the
loading position at a height between 600 mm and 1 700 mm from the floor level.
For the position of emergency stop controls see 5.1.5.
The controls for each sawblade drive motor shall include an indication, e.g. by a light signal or a two position switch
when power is supplied to that motor.
Verification : By checking the relevant drawings and/or circuit diagrams, inspection, measurement and relevant
functional testing on the machine.
5.1.3 Starting
See 9.2.5.2 of EN 60204-1: 1992 and in addition :
For the purposes of this European Standard "all safeguards are in place and functional" is achieved by the
interlocking arrangements described in 5.2.7 and "operational" means rotation of any sawblade spindle.
It shall be possible to start each sawblade drive motor separately.
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and relevant functional testing
on the machine.
5.1.4 Normal stopping
A stop control shall be fitted which, when actuated, stops all machine actuators and cuts power to them once
stopping is complete.
The category of the stop function (category 0 or 1) shall be in accordance with the requirements of 9.2.2 of EN
60204-1: 1992, where the "safety and/or functional“ requirements of the machine are fulfilled by maintaining power
to the electrical brake (if provided) and/or powered clamping (if provided) until stopping is complete.
These requirements shall be satisfied at the level of the control circuits. If a time delay device is used, the time
delay shall be at least the maximum run-down time. Either the time delay shall be fixed or the time delay
adjustment device shall be sealed.
If the emergency stop provided by virtue of 5.1.5 also achieves at least the above requirements, then the
emergency stop can be regarded as fulfilling the requirements of the normal stop control.
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and relevant functional testing
on the machine.
5.1.5 Emergency stop
See EN 418 : 1992 and in addition :
Machines shall be fitted with an emergency stop control(s) which shall conform to the requirements of 9.2.5.4 and
10.7 of EN 60204-1: 1992. However 10.7.5 of EN 60204-1: 1992 does not apply.
The emergency stop control(s) shall be located so that the operator can reach it (them) with the sliding table in any
position.
The category of the stop function (category 0 or 1) shall be in accordance with the requirements of 9.2.2 of EN
60204-1: 1992, where the "safety and/or functional“ requirements of the machine are fulfilled by maintaining power
to the electrical brake (if provided) and/or powered clamping (if provided) until stopping is complete.
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and relevant functional testing
on the machine.
5.1.6 Failure of the power supply
On electrically driven machines an automatic restart after the restoration of the supply voltage following a supply
interruption shall be prevented in accordance with the requirements of 7.5, paragraphs 1 and 3, of EN 60204-1:
1992.
On machines with pneumatic clamping of the workpiece, provision shall be made to maintain clamping pressure in
the event of a pneumatic power failure. Where non-return valves are used to meet this requirement, they shall be
fitted to the actuating cylinders.
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and relevant functional testing
on the machine.
5.1.7 Failure of the control circuits
See 5.1.1.
5.2 Protection against mechanical hazards
5.2.1 Stability
Machines shall be provided with the facility e.g. holes, for fixing them to the floor or other stable structure (also see
6.3).
Transportable machines shall meet the requirements of annex A.
Transportable machines fitted with wheels shall have the facility to make them stable during cutting e.g. brakes for
the wheels or a device to retract the wheels from the floor.
NOTE The requirements for a stability test for transportable machines with wheels, both when moved from location to
location and when in use, will be considered at the first revision of this standard.
Verification : By checking the relevant drawings, inspection and relevant functional testing on the machine.
5.2.2 Risk of break-up during operation
The sawblade guards required by 5.2.7.1 shall be manufactured from materials with at least the following
properties :
-2
a) steel with an ultimate breaking strength of at least 350 N mm and a wall thickness of at least 2 mm;
b) light alloy with the characteristics shown in Table 2;
Table 2 — Light alloy sawblade guard thickness and tensile strength
Minimum ultimate tensile strength Minimum thickness
-2
N mm mm
180 5
240 4
300 3
c) polycarbonate with a wall thickness of at least 3 mm or other plastic material with such a wall thickness that
the impact strength is equal to or better than that of polycarbonate of 3 mm thickness;
-2
d) cast iron with an ultimate tensile strength of at least 200 N mm and a wall thickness of at least 5 mm.
Verification : By checking the relevant drawings, measurement, inspection of the machine and for the tensile
strength by a confirmation from the manufacturer of the material.
5.2.3 Tool holder and tool design
See 6.3, EN 847-1 : 1997 and in addition :
5.2.3.1 Geometrical performance
The sawblade spindle shall be manufactured to at least the requirements given in annex B.
The part of the spindle upon which the sawblades are located shall have a minimum tolerance of g6 in accordance
with the requirements of ISO 286-2 : 1988.
Verification : By checking the relevant drawings and by measurement.
5.2.3.2 Strength
-2
The tool spindle shall be manufactured in steel with an ultimate tensile strength of at least 580 N mm .
Verification : By checking the relevant drawings and for tensile strength by steel manufacturer’s confirmation.
5.2.3.3 Spindle unit locking
Spindle units that are capable of being adjusted, shall be held in the adjusted position during machining.
Verification : By checking the relevant drawings, inspection and relevant functional testing on the machine.
5.2.3.4 Spindle locking
When it is necessary to hold the spindle stationary for tool changing, a spindle holding device shall be provided.
Verification : By checking the relevant drawings, inspection and relevant functional testing on the machine.
5.2.3.5 Spindle rings
Where spindle rings are provided they shall :
a) have a tolerance of 0,1 mm on the internal diameter;
-2
b) be manufactured in steel with an ultimate tensile strength of at least 350 N mm and have a wall thickness
of at least 9,5 mm (see also annex E).
Verification : By checking the relevant drawings, inspection, measurement and steel manufacturers' confirmation.
5.2.3.6 Sawblade fixing device
Where the sawblade is not axially adjustable, two saw flanges, or in the case of flush mounted sawblades a single
flange, shall be provided for the sawblade spindles. Where the sawblade is axially adjustable, spindle rings shall be
provided.
For sawblades with a diameter  400 mm, the diameter of both flanges (or flange for flush mounting) shall be  D/5
(where D = the diameter of the largest sawblade for which the machine is designed). For sawblades with a
diameter > 400 mm the diameter of the flange(s) shall be  D/7 but not less than 80 mm.
For flanges other than those for flush mounted sawblades, the clamping surface at the outside part of the flanges
shall be flat over at least a 5 mm width and recessed to the centre (see Figure 5). Where two flanges are provided,
both outside diameters shall be within a tolerance of  1 mm.
Figure 5 — Saw flange detail
Precautions shall be taken to ensure that the sawblade does not come loose during start up, running, run-down or
braking e.g. by using a positive connection between the spindle and the saw blade or by using a positive
connection between the front saw flange and the saw spindle.
Verification : By checking the relevant drawings, measurement, inspection and relevant functional testing on the
machine.
5.2.4 Braking
5.2.4.1 General
An automatic brake shall be provided for tool spindles where the unbraked run down time is more than 10 s.
The braked run-down time shall be less than 10 s, or where the run-up time exceeds 10 s the braked run-down
time shall be less than the run-up time but in no case exceed 30 s.
For electrical braking, reverse current injection braking shall not be used.
Verification : For the determination of braked run-down time, unbraked run-down time and run-up time, see the
appropriate test below.
5.2.4.2 Conditions for all tests
a) the spindle unit shall be set in accordance with the manufacturer’s instructions (e.g. belt tension);
b) when selecting the speed and the sawblade, conditions shall be chosen which create the greatest kinetic
energy for which the machine is designed;
c) warm up the spindle unit for at least 15 min by running the machine under no load before beginning the
test;
d) verify that the actual spindle speed is within 10 % of the intended speed;
e) when testing a unit provided with manual star delta starting, the manufacturer’s instructions for starting
shall be observed;
f) the speed measuring equipment shall have an accuracy of at least ± 1 % of full scale;
g) the time measuring equipment shall have an accuracy of at least ± 0,1 s.
5.2.4.3 Tests
5.2.4.3.1 Unbraked run-down time
The unbraked run-down time shall be measured as follows :
a) start the spindle drive motor and run at the intended speed (no load) for 1 min;
b) cut power to the spindle drive motor and measure the unbraked run-down time;
c) repeat steps a) and b) twice more.
The unbraked run-down time of the sawblade spindle is the average of the three measurements taken.
5.2.4.3.2 Braked run-down time
The braked run-down time shall be measured as follows :
a) start the spindle drive motor and run at the intended speed (no load) for 1 min;
b) cut power to the spindle drive motor and measure the braked run-down time;
P
c) allow the spindle to remain stationary for ( ) min (where P is the motor power (rated input) in kW). The
7.5
re-start interval shall not be less than 1 min;
d) repeat steps b) to d) twice.
The braked run-down time of the sawblade spindle is the average of the three measurements taken.
5.2.4.3.3 Run-up time
The run-up time shall be measured as follows :
a) cut power to the sawblade spindle drive motor and allow the spindle to come to a complete stop;
b) re-start the sawblade spindle drive motor and measure the run-up time;
c) repeat steps a) and b) twice more.
The run-up time of the sawblade spindle is the average of the three measurements taken.
5.2.5 Devices to minimise the possibility or the effect of ejection
To avoid the ejection of off-cuts, a means, e.g. a deflector, shall be provided to move the off-cuts away from the
sawblade to prevent them from contacting other sawblades on the machine.
Machines shall be designed so that climb cutting is not possible with the main sawblade and the horizontal
sawblades. Where climb cutting is provided to the vertical sawblades (see 3 in Figure 1) the guarding provided at
the outfeed end of the machine in accordance with the requirements of 5.2.7 shall be capable of containing any
ejected off-cut.
Riving knives shall be provided for the vertical sawblades.
The riving knife of the upper vertical sawblade shall be designed so as to prevent off-cuts from falling onto the
lower vertical sawblade (e.g. see Figure 6).
Verification : By checking the relevant drawings, inspection and relevant functional testing on the machine.
Key 1 Riving knife for upper vertical sawblade
Figure 6 — Example of riving knife for the upper vertical sawblade
The riving knife and its mounting arrangement shall have the following characteristics :
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a) the riving knife shall be manufactured from steel with a minimum tensile strength of 580 N mm , or of a
comparable material, have flat sides (within 0,1 in 100 mm) and shall have a thickness between the width of
the sawblade and the width of the cut (see Figure 7).
Verification : By checking the relevant drawings, measurement and steel manufacturers confirmation of tensile
strength.
Key e Riving knife thickness
B Width of cut
b Width of sawblade
Figure 7 — Thickness of riving knife in relation to sawblade dimensions
b) the riving knife shall be capable of adjustment so that at its maximum adjustment its tip is in line with the
periphery of the sawblade (see Figure 8).
Verification : By checking the relevant drawings, inspection and measurement.
Figure 8 — Riving knife height adjustment
c) the riving knife shall be designed so that when it is mounted and adjusted, and its closest point to the
sawblade is 3 mm from the sawblade, then at no point shall the gap between the sawblade and the riving knife
exceed 8 mm, measured radially through the centre of the saw spindle (see Figure 9).
Verification : By checking the relevant drawings, inspection and measurement.
Figure 9 — Riving knife positioning limits
d) the riving knife fixing arrangement shall be such that the relative position of the riving knife and the fixed
sawblade flange is in accordance with the tolerances shown in Figure 10. The relative position of the riving
knife and the fixed sawblade flange shall be maintained with the rise and fall and tilt of the sawblade.
Verification : By checking the relevant drawings, inspection, measurement and functional testing on the
machine.
Key 1 Fixed saw flange
2 Riving knife
3 Maximum tolerance 0,2 mm
Figure 10 — Positioning of riving knife in relation to the fixed saw flange
e) the riving knife shall be held in position by guiding elements, e.g. guiding pins (see Figure 11). The riving
knife fixing slot shall not be more than 0,5 mm wider than the guiding elements.
Verification: By checking the relevant drawings, inspection and measurement.
Figure 11 — Example of riving knife fixing arrangement
f) the riving knife shall either conform with the lateral stability test laid down in annex C, or the width of the
riving knife on each side of the fixing slot within the fixing area shall be designed according to the following
formula :
D
max
X + Y  where X = Y  0,5 Y
where D is the maximum sawblade diameter for which the riving knife can be used.
max
X and Y shall be measured midway along the riving knife fixing slot in the fixing area (see Figure 12).
Verification : Carry out, as appropriate, test at annex C, or check relevant drawings, inspection and
measurement.
Key
1 Fixing area
2 Measuring point
Figure 12 — Width of riving knife in the fixing area
5.2.6 Workpiece supports and guides
Machines shall be provided with a fence on the sliding table against which the workpiece is located during
machining. If the workpiece guiding part of the fence is adjustable and if there is a possibility of contact between
the fence and the sawblades that part of the fence shall be made of plastic, light alloy or wood.
Verification : By checking the relevant drawings, inspection and relevant functional testing on the machine.
5.2.7 Prevention of access to moving parts
5.2.7.1 Prevention of access to sawblades
5.2.7.1.1 Guarding the front (operating position) of the machine
Access to the sawblades from below the sliding table guide shall be prevented by fixed guards.
Access to the sawblades from above the sliding table guide shall be prevented by a combination of fixed and
adjustable guards. These adjustable guards shall be fitted to both sides of the sliding table and may be of the
telescopic, sliding or roller-shutter type.
Guarding shall extend over the full length of the machine except for the openings necessary for the positioning of
the workpiece and the operation of a manual clamping device.
The guards shall be in accordance with the dimensions given in Figure 13.
Verification : By checking the relevant drawings, inspection, measurement and relevant functional testing on the
machine.
Dimensions in millimetres
Key
1 Opening for operation of clamping device
2 Opening necessary for loading the workpiece (this opening may
also be described as clamping bridge area)
3 Opening for operation of clamping device
Figure 13 — Illustration of machine safeguarding
5.2.7.1.2 Guarding the rear and both sides of the machine
Access to the sawblades from the rear and from both sides of the machine shall be prevented by a combination of
fixed and interlocked moveable guards. These guards shall be in accordanc
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