Bsi bs en 01870 2 1999 (2003)

BRITISH STANDARD BS EN 1870 2 1999 Incorporating Corrigendum No 1 Safety of woodworking machines — Circular sawing machines — Part 2 Horizontal beam panel saws and vertical panel saws The European Sta[.]

Safety of woodworking

machines —

Circular sawing

machines —

Part 2: Horizontal beam panel saws and

vertical panel saws

The European Standard EN 1870-2:1999 has the status of a

British Standard

ICS 79.120.10

This British Standard, having

been prepared under the

direction of the Engineering

Sector Committee, was

published under the authority

of the Standards Committee

and comes into effect on

15 November 1999

© BSI 6 January 2003

ISBN 0 580 32806 6

including Corrigendum July 2002

The UK participation in its preparation was entrusted to Technical Committee MTE/23, Woodworking machines, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

— aid enquirers to understand the text;

— present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

— monitor related international and European developments and promulgate them in the UK

Amendments issued since publication

14071

Corrigendum No 1 6 January 2003 Correction to 5.2.7.5.3

ICS 79.120.10 Incorporating corrigendum July 2002

English version

Safety of woodworking machines — Circular sawing machines — Part 2: Horizontal beam panel saws and vertical panel saws

Sécurité des machines pour le travail du bois —

Machines à scies circulaires —

Partie 2: Scies circulaires à panneaux horizontales

et à presseur et scies à panneaux verticales

Sicherheit von Holzbearbeitungsmaschinen —Kreissägemaschinen —

Teil 2: Horizontale Plattenkreisssägemaschinen mit Druckbalken und

Vertikalplattenkreissägemaschinen

This European Standard was approved by CEN on 26 December 1998

CEN members are bound to comply with the CEN/CENELEC Internal

Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration Up-to-date lists and

bibliographical references concerning such national standards may be obtained

on application to the Central Secretariat or to any CEN member

This European Standard exists in three official versions (English, French,

German) A version in any other language made by translation under the

responsibility of a CEN member into its own language and notified to the

Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium,

Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,

Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and United Kingdom

CEN

European Committee for StandardizationComité Européen de NormalisationEuropäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

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

December 1999, and conflicting national standards

shall be withdrawn at the latest by December 1999

This European Standard has been prepared under a

mandate given to CEN by the European

Commission and the European Free Trade

Association, and supports essential requirements of

EU Directive(s)

For relationship with EU Directive(s),

see informative Annex ZA, which is an integral part

of this standard

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

Organizations contributing to the preparation of

this European Standard include the European

Manufacturers’ Association, EUMABOIS

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)

Common requirements for tooling are given in

tolerances of saw spindles 36Annex B (normative) Riving knife

mounting strength test 36Annex C (normative) Riving knife

lateral stability test 37Annex D (normative) Rigidity test for

sectional safety curtain material 38Annex E (informative) Safe working practice 38Annex ZA (informative) Clauses of this

European standard addressing essentialrequirements or other provisions

0 Introduction

This European Standard has been prepared to be a harmonized 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 horizontal beam panel saws and vertical panel saws

This standard also includes information to be provided by the manufacturer to the user

1 Scope

This European Standard specifies the requirements and/or measures to remove the hazards and limit the risks on manually loaded and/or unloaded horizontal beam panel saws and vertical panel saws hereinafter referred to as “machines”, designed to cut solid wood, chipboard, fibreboard, plywood and also these materials where they are covered with plastics edging and/or plastics/light alloy laminates

This European Standard covers all the hazards relevant to this machine These hazards are listed

in Clause 4.

This European Standard does not cover machines intended only for ripping solid wood or machines where the workpiece is moved during the cutting process, or machines specifically designed for cutting veneers.This European Standard does not apply to hand-held woodworking machines or any adaptation permitting their use in a different mode, i.e bench mounting

For Computer Numerically Controlled (CNC) machines, this European Standard does not cover the hazards related to Electromagnetic Compatibility (EMC) as stated in the EMC Directive 89/336/EEC dated 3-5-89

This European Standard is primarily directed at machines which are manufactured after the date of issue

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

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 —

EN 292/A1:1995, Part 2: Technical principles and specifications.

EN 294:1992, Safety of machinery — Safety distances to prevent danger zones being reached by the upper

EN 953:1997, Safety of machinery — Guards — General requirements for the design and construction of

fixed and movable guards.

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 their components — Hydraulics.

EN 983:1996, Safety requirements for fluid power systems and their components — Pneumatics.

EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — General principles

and provisions for design.

EN 1760-1:1997, Safety of machinery — Pressure-sensitive protection devices — Part 1: General principles

for the design and testing of pressure sensing mats and pressure sensing floors.

EN 60204-1:1992, Safety of machinery — Electrical equipment of machines — Part 1: General

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 947-4-1:1990)

EN 60947-5-1:1991, Low voltage switchgear and control gear — Part 5: Control circuit devices and

switching elements — Section 1: Electromechanical control circuit devices

(IEC 947-5-1:1990)

prEN 61496-2, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular

requirements for equipment using active opto-electronic protective devices.

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 walled 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 method 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 using an enveloping measurement surface over a reflecting plane

(ISO 3746:1995)

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 — Survey method for the

measurement 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)

ISO 3745: 1977, Acoustics — Determination of sound power levels of noise sources — Precision methods for

anechoic and semi anechoic rooms.

ISO 7960: 1995, Airborne noise emitted by woodworking machine tools — Operating conditions for

woodworking machines.

ISO TR 11688-1:1995, Acoustics — Recommended practice for the design of low noise machinery and

equipment — Part 1: Planning.

HD 21.1 S31997, Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V —

Part 1: General requirements.

HD 22.1 S31997, Rubber insulated cables of rated voltages up to and including 450/750 V —

Part 1: General requirements.

horizontal beam panel saw

panel saw where the workpiece is supported in the horizontal plane during cutting The saw unit is mounted below the workpiece, and the cutting stroke is power driven Before the cutting stroke commences, the sawblade is automatically raised through a slot in the worktable and is retracted from the workpiece for the return stroke Machines are fitted with a pressure beam which holds the workpiece in position during the cut, and are designed to cut in a single straight line only (see Figure 1)

3.3

vertical panel saw

panel saw where the workpiece is supported in a near vertical plane during cutting [see Figure 2a) and Figure 2b)]

Figure 1 — Example of horizontal beam panel saw

Figure 2a) — With saw unit mounted in front of the workpiece

Figure 2 — Examples of vertical panel saws

3.4

vertical panel saw with hand feed

vertical panel saw where the saw unit is hand fed through the workpiece during vertical and/or horizontal cutting

3.5

vertical panel saw with integrated feed

vertical panel saw where the saw unit has integrated feed for its vertical, and/or horizontal movement The sawblade is automatically projected through the workpiece during the cutting stroke and retracted from the workpiece during the return stroke

Figure 2b) — With the saw unit behind the workpiece

Figure 2 — Examples of vertical panel saws (concluded)

3.6

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, as illustrated in Figure 5, and the use of a demountable power feed unit)

NOTE The words in brackets are not applicable to this European Standard.

3.7

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 are held and controlled mechanically during the machining operation

3.8

manual loading of panel saws

where the operator positions the workpiece on the workpiece support at the cutting position i.e there is no intermediate loading device to receive and transfer the workpiece from the operator to the cutting position

3.9

manual unloading of panel saws

where the operator removes the workpiece from the workpiece support at the cutting position, i.e there is

no intermediate unloading device to transfer the workpiece from the cutting position to the operator

post-formed edge pre-cutting

cut made in the rear profiled edge of the workpiece deep enough to prevent surface damage when the main sawblade makes its cut

3.14

post-formed edge pre-cutting sawblade

sawblade used for post-formed edge pre-cutting This may be the scoring sawblade or a separate sawblade specifically for this purpose

saw unit rest position

the position to which the saw unit returns at the end of each cutting cycle on integrated fed machines

4 List of hazards

This standard deals with all 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 Parts 1 and 2 of EN 292:1991

These hazards are listed in Table 1 in accordance with Annex A of EN 292-2:1991/A1:1995

Table 1 — List of hazards

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 ofPotential energy by:

— elastic elements (springs), or

— liquids or gases under pressure, or

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

materials/workpieces) 5.2.2, 5.2.3, 5.2.5, 5.2.6, 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 their mechanical nature) Not relevant

2 Electrical hazards, caused for example by:

2.1 electrical contact (direct or indirect) 5.3.4, 5.3.15

2.3 thermal radiation or other phenomena such as ejection of molten

particles, and chemical effects from short circuits, overloads, etc Not relevant

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

explosions and also by the radiation of heat sources Not relevant

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 of

4.2 interference with speech communication, acoustic signals, etc 5.3.2

5 Hazards generated by vibration (resulting in a variety of

neurological and vascular disorders) Not relevant

6 Hazards generated by radiation, especially by:

6.3 ionizing radiation sources Not relevant

6.4 machines making use of high frequency electro magnetic fields Not relevant

Table 1 — List of hazards (concluded)

5 Safety requirements and/or measures

For guidance in connection with risk reduction by design, see 3 of EN 292-2:1991, 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 are those for:

— starting (see 5.1.3);

— normal stopping (see 5.1.4);

— emergency stop (see 5.1.5);

— interlocking (see 5.1.3 and 5.2.7);

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, gases, mists, fumes and dusts 5.3.3

7.2 fire and explosion hazard 5.3.1, 5.3.3

7.3 biological and microbiological (viral or bacterial) hazards Not relevant

Hazards generated by neglecting ergonomic principles in machine

design (mismatch of machinery with human characteristics and

abilities) caused for example by:

unhealthy postures or excessive efforts

inadequate consideration of human hand/arm or foot/leg anatomy

neglected use of personal protection equipment

inadequate area lighting

mental overload or underload, stress, etc

Hazards caused by failure of energy supply, breaking down of

machinery parts and other functional disorders, for example:

failure of energy supply (of energy and/or control circuits)

unexpected ejection of machine parts or fluids

failure, malfunction of control system (unexpected start-up,

unexpected overrun)

errors of fitting

overturn, unexpected loss of machine stability

5.1.10 5.2.2, 5.2.5 5.1.6 6.3 5.2.1

Hazards caused by (temporary) missing and/or incorrectly

positioned safety related measures/means, for example:

all kinds of guards

all kinds of safety related (protection) devices

starting and stopping devices

safety signs and signals

all kinds of information or warning devices

energy supply disconnecting devices

emergency devices

feeding/removal means for workpieces

essential equipment and accessories for safe adjusting and/or

maintaining

equipment evacuating gases, etc

5.2.7 5.1.1, 5.2.7 5.1.2, 5.1.3, 5.1.4, 5.1.5 6.2

6.2.1, 6.2.2, 6.3 5.3.15

5.1.5 5.2.6 5.3.16 5.3.3

— interlocking with guard locking (see 5.2.7);

— mode selection (see 5.1.6);

— trip device (see 5.2.7);

— sectional safety curtain (see 5.2.7);

— pressure beam (see 5.1.3);

— movement of panel pushers and side pressure (see 5.2.6.1);

— the reset control device (see 5.2.7.5.3);

— initiation of the braking system (see 5.2.4).

These control systems shall, as a minimum, be designed and constructed using well tried components and principles

For the purpose of this European Standard “well tried components and principles” means:

a) electrical components if they conform to relevant standards including the following:

— EN 60947-5-1:1991 (Section 3) for control switches with positive opening operation used as

mechanically actuated position detectors for interlocking of guards and for relays used in auxiliary circuits;

— EN 60947-4-1:1992 for electromechanical contactors and motor starters used in mains circuits;

— HD 22.1 S3:1997 for rubber insulated cables;

— 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) mechanical components if they conform to 3.5 of EN 292-2:1991/A1:1995;

c) mechanically actuated position detectors for guards if they are actuated in positive mode and their

arrangement/fastening and the cam design/mounting conform to 5.2.2 and 5.2.3 of EN 1088:1995;

d) hydraulic and pneumatic components and systems if they conform to EN 982:1996 and EN 983:1996 respectively;

e) electrical principles if they conform to the first four measures listed in 9.4.2.1 of EN 60204-1:1992 The

circuits shall be “hardwired” If electronic components are used in safety related control systems “well

tried” is fulfilled if they are in accordance with 9.4.2.2 or 9.4.2.3 of EN 60204-1:1992.

Time delay devices used in safety related control circuits may be of category B in accordance with

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, inspection of the machine; for

electrical components by requiring a confirmation from the manufacturer of the component which declares conformity with the relevant standards

5.1.2 Position of controls

5.1.2.1 Vertical panel saws with hand feed

The start and normal stop controls shall be positioned either:

a) on a control panel attached to the moving beam; or

b) on the saw unit, and in this case the minimum height of 600 mm given in 6.1.1 of EN 60204-1:1992

does not apply

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.2.2 Vertical panel saws with integrated feed

The start and stop controls shall be positioned together such that the working area is visible to the operator

There shall be one emergency stop at each of the following positions:

a) on the moving beam on which the saw unit is mounted;

b) at each end of the machine;

c) together with the normal start and stop controls

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.2.3 Horizontal beam panel saws

The start and stop controls shall be positioned together such that the working area is visible to the operator

Emergency stop controls shall be situated:

a) on the main control panel and any auxiliary control panels;

b) at each side of any loading/unloading openings, unless a main control panel or auxiliary control panel

is situated at this position

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.3 Starting

See 9.2.5.2 of EN 60204-1:1992, first and second sentence, and in addition:

For the purposes of this European Standard “all of the safeguards in place and functional” is achieved by

the interlocking arrangements described in 5.1.3, 5.1.4, 5.1.5 and 5.2.7, and “operation” means rotation

and/or powered adjustment of any saw spindle and/or workpiece holding device and/or any machine element in which a tool is mounted

The exceptions described in 9.2.5.2 of EN 60204-1:1992 are not relevant.

The requirements shall be met at the level of the control circuits

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.3.1 Horizontal beam panel saw: clamping

The machine shall be designed so that:

a) the pressure beam shall remain up even when power is lost to the actuators of the pressure beam On pneumatic or hydraulic systems, where non-return valves are used, these valves shall be fitted at the actuating cylinders;

b) when the pressure beam moves down, it shall move parallel with the worktable (±5 mm over the working length of the pressure beam);

c) the sawblade shall have reached its lowest position below the worktable before the pressure beam begins to move to its uppermost position

Verification: by checking the relevant drawings and/or circuit diagrams and relevant functional testing of

the machine

5.1.3.2 Horizontal beam panel saw: cutting stroke

The automatic cutting stroke shall only be possible after:

a) the support carrying the deterring impeding device in the form of a sectional safety curtain has been moved to the position where the sectional safety curtain closes the apertures around the workpiece; and afterwards;

b) the pressure beam has been lowered from its uppermost position (see also 5.2.7.5.2).

The non-cutting or return stroke shall only be capable of being initiated when the sawblade has been retracted to its lowest point below the table

The panel pusher shall not be capable of forward movement under power during the cutting stroke

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.4 Normal stopping

Machines shall be fitted with a stop control which, when actuated shall disconnect power from all the machine actuators and actuate the brake (if provided)

The stopping sequences required in 5.1.4.1, 5.1.4.2, 5.1.4.3, 5.1.5.1, 5.1.5.2 and 5.1.5.3 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 braked run-down time Either the time delay shall be fixed or the time delay adjustment device shall be sealed

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.4.1 Vertical panel saw with hand feed

For vertical panel saws with hand feed fitted with a mechanical brake, the stop control required by 5.1.4 shall be a category 0 stop in accordance with 9.2.2 of EN 60204-1:1992.

For vertical panel saws with hand feed and an electrical brake, the stop control required by 5.1.4 shall be

a category 1 control in accordance with 9.2.2 of EN 60204-1:1992 The stopping sequence shall be:

a) actuate the brake and cut power to other machine actuators;

b) when the braking sequence is complete, cut power to the brake

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.4.2 Vertical panel saw with integrated feed

The stop control required by 5.1.4 shall be a category 1 stop in accordance with 9.2.2 of EN 60204-1:1992

The stopping sequence shall be:

a) stop any saw unit traversing movement and retract the sawblade;

b) cut power to the sawblade spindle drive motor and actuate the brake (if provided) and cut power to other machine actuators except clamping (if fitted);

c) cut power to brake if electrical when braking sequence is complete

Verification: by checking the relevant drawing and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.4.3 Horizontal beam panel saw

The stop control required by 5.1.4 shall be a category 1 stop in accordance with 9.2.2 of EN 60204-1:1992.

The stopping sequence shall be:

a) stop any saw unit traversing movement and lower the sawblade;

b) cut power to the sawblade spindle drive motor, actuate the brake (if provided), return the saw unit to its rest position, release clamping pressure and return the pressure beam to its rest position;

c) cut power to brake if electrical when braking sequence is complete

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.5 Emergency stop

5.1.5.1 Vertical panel saw with integrated feed

See EN 418:1992 and in addition:

Machines shall be fitted with emergency stop control(s) positioned in accordance with the requirements

of 5.1.2.2 Emergency stop control(s) shall conform to 9.2.5.4 and 10.7 of EN 60204-1:1992 10.7.5

of EN 60204-1:1992 does not apply Emergency stop control(s) shall be category 1 controls in accordance

with 9.2.2 of EN 60204-1:1992 The stopping sequence shall be:

a) stop any saw unit traversing movement and retract the sawblade;

b) cut power to the sawblade spindle drive motor, actuate the brake (if provided) and release clamping pressure where powered clamping is provided;

c) cut power to brake if electrical when braking sequence is complete

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.5.2 Horizontal beam panel saw

Machines shall be fitted with emergency stop control(s) positioned in accordance with 5.1.2.2 Emergency stop controls shall conform to 9.2.5.4 and 10.7 of EN 60204-1:1992 Emergency stop controls shall be category 1 stops in accordance with 9.2.2 of EN 60204-1:1992 The stopping sequence shall be:

a) stop any saw unit traversing movement and retract the sawblade;

b) cut power to machine actuators except clamping and actuate the brake (if fitted);

c) raise the pressure beam;

d) cut power to brake if electrical when braking sequence is complete

Means of releasing the clamping pressure after the operation of the emergency stop shall be provided

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.6 Failure of the power supply

On electrically driven machines an automatic restart in the case of a supply interruption after the

restoration of the voltage shall be prevented in accordance with 1, 3 and 7.5 of EN 60204-1:1992.

On machines with the facility for post-formed edge pre-cutting, in the event of pneumatic failure the post-formed edge pre-cutting sawblade shall remain in the adjusted low position

On machines with pneumatic clamping of the workpiece, provision shall be made to maintain clamping pressure in the event of pneumatic power failure, e.g by a non-return valve

Verification: by checking the relevant drawings and/or circuit diagrams, inspection and relevant functional

testing of the machine

5.1.7 Failure of control circuits

5.2.2 Risk of break-up during operation

The guards for the sawblade(s) excluding the sectional safety curtain shall be manufactured from:

a) steel having an ultimate tensile strength of at least 350 N mm–2 and a wall thickness of at

least 1,5 mm;

b) light alloy with the following characteristics:

c) polycarbonate with a wall thickness of at least 3 mm or other plastics material having an impact strength equal to or better than that of polycarbonate of at least 3 mm thickness;

d) cast iron with an ultimate tensile strength of at least 200 N mm–2 and a wall thickness of at

least 5 mm

Verification: by checking the relevant drawings, measurement, inspection on the machine and for the

tensile strength a confirmation from the manufacturer of the material

5.2.3 Tool holder and tool design

Saw flanges (or in the case of flush mounted sawblades a flange) shall be provided The diameter of the flanges shall be at least (where D = diameter of the largest sawblade for which the machine is designed)

Where two flanges are provided, both outside diameters of the saw flanges shall be within a tolerance

of ±1 mm The clamping surface shall be at least 3 mm in width and recessed to the centre

Verification: by checking the relevant drawings, inspection and measurement.

When it is necessary to hold the spindle stationary for saw blade changing, a spindle holding device shall

be provided This may be a double spanner, which combines the holding of the spindle stationary with the locking and unlocking of the saw spindle nut in one tool, or some other locking device

Verification: by checking the relevant drawings, inspection and functional testing of the machine.

Precautions shall be taken to ensure that the sawblade does not come loose during start up, running, during rundown or during 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, inspection and functional testing of the machine.

Saw spindles shall be manufactured in accordance with the tolerances given in Annex A

Verification: by checking the relevant drawings and measurement.

5.2.4 Braking

5.2.4.1 General

On machines where the sawblade is accessible an automatic brake shall be provided for the saw spindle(s) where the unbraked run-down time is more than 10 s

The braked run-down time shall be less than 10 s

On machines where the sawblade is not accessible an automatic brake shall be provided for the saw spindle(s) where the unbraked run-down time is more than 60 s

The braked run-down time shall be less than 60 s

Electrical braking shall be by direct current injection only

Verification: for the determination of unbraked run-down time and braked run-down time, if relevant,

see the appropriate test below

Ultimate tensile strength

5.2.4.2 Conditions for all tests

The spindle unit shall be set in accordance with the manufacturer’s instructions (e.g belt tension).When selecting the speed and the sawblade(s), conditions shall be chosen which create the greatest kinetic energy for which the machine is designed

Warm up the spindle unit for at least 15 min by running the machine under no load before beginning the test

Verify that the actual spindle speed is within 10 % of the intended speed

When testing a unit provided with manual star delta starting, the manufacturer’s instructions for starting shall be observed

The speed measuring equipment shall have an accuracy of at least ±1 % of full scale

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) cut the power to the spindle drive motor and measure the unbraked run-down time;

b) restart the spindle drive motor and allow it to reach the intended speed;

c) repeat steps a) and b) twice more

The unbraked run-down time of the machine 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) cut the power to the spindle drive motor and measure the braked run-down time;

b) allow the spindle to remain stationary for 1 min;

c) restart the spindle drive motor and run at no load for 1 min;

d) repeat steps a) to c) nine times

The braked run-down time of the machine is the average of the ten measurements taken

5.2.5 Devices to minimize the possibility or the effect of ejection

Vertical panel saws, except those machines fitted with a pressure beam which applies pressure to the workpiece on both sides of the sawblade during cutting, shall be supplied with a riving knife The riving knife shall be capable of being retracted under manual control for cuts which start other than at the edge

of the workpiece On vertical panel saws with integrated feed, the riving knife shall automatically return

to its normal operating position when the sawblade next returns to its retracted position On vertical panel saws with hand feed the riving knife shall be held in the retracted position by a hold to run control device

Verification: by checking the relevant drawings, inspection and relevant functional testing of the machine.

The riving knife and its fixing arrangement shall have the following characteristics:

a) riving knives shall be manufactured from steel with a minimum tensile strength of 580 N mm–2, or of

a comparable material, have flat sides (within 0,1 mm in 100 mm) and shall have a thickness between the width of the sawblade and the width of cut (see Figure 3);

Verification: by checking the relevant drawings, measurement and steel manufacturers confirmation of

tensile strength

b) the leading edge of the riving knife shall be chamfered to provide a lead in (see Figure 4), and the riving knife shall be of constant thickness (within ±0,05 mm) throughout its working length;

Verification: by checking the relevant drawings, inspection and measurement.

c) the riving knife shall be capable of adjustment so that its tip reaches a point level with or lower than the highest point on the periphery of the sawblade when set in accordance with the requirements of this European Standard [see Figure 5a)];

Verification: by checking the relevant drawings, inspection and measurement.

d) the riving knife shall be designed so that when it is mounted and adjusted so that 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 5b)];

Verification: by checking the relevant drawings, inspection and measurement.

Figure 3 — Thickness of riving knife in relation to sawblade dimensions

Figure 4 — Chamfered leading edge of riving knife

Figure 5a) — Riving knife height adjustment Figure 5 — Riving knife adjustment