BS EN 848-1 Safety Standards

BRITISH STANDARD BS EN
848-1:2007
Safety of woodworking
machines — One side
moulding machines
with rotating tool —
Part 1: Single spindle vertical moulding
machines
The European Standard EN 848-1:2007 has the status of a
British Standard
ICS 79.120.10
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BS EN 848-1:2007
This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 30 March 2007
© BSI 2007
ISBN 978 0 580 50423 5
National foreword
This British Standard was published by BSI. It is the UK implementation of
EN 848-1:2007. It supersedes BS EN 848-1:1999 which is withdrawn.
The UK participation in its preparation was entrusted to Technical Committee
MTE/23, Woodworking machines.
A list of organizations represented on MTE/23 can be obtained on request to its
secretary.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from
legal obligations.
Amendments issued since publication
Amd. No. Date Comments

EUROPEANSTANDARD
NORMEEUROPÉENNE
EUROPÄISCHENORM
EN 848-1
February 2007
ICS 79.120.10 Supersedes EN 848-1:1998
English Version
Safety of woodworking machines - One side moulding machines
with rotating tool - Part 1: Single spindle vertical moulding
machines
Sécurité des machines pour le travail du bois - Machines à
fraiser sur une face, à outil rotatif - Partie 1: Toupie
monobroche à arbre verticale
Sicherheit von Holzbearbeitungsmaschinen -
Fräsmaschinen für einseitige Bearbeitung mit drehendem
Werkzeug - Teil 1: Einspindelige senkrechte
Tischfräsmaschinen
This European Standard was approved by CEN on 13 January 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref. No. EN 848-1:2007: E

EN 848-1:2007 (E)
2
Contents Page
Foreword..............................................................................................................................................................4
Introduction.........................................................................................................................................................5
1 Scope ......................................................................................................................................................6
2 Normative references ............................................................................................................................6
3 Terms and definitions ...........................................................................................................................9
3.1 General....................................................................................................................................................9
3.2 Definitions ..............................................................................................................................................9
3.3 Terminology .........................................................................................................................................14
4 List of significant hazards ..................................................................................................................17
5 Safety requirements and/or measures ..............................................................................................20
5.1 General..................................................................................................................................................20
5.2 Controls ................................................................................................................................................20
5.2.1 Safety and reliability of control systems...........................................................................................20
5.2.2 Position of controls .............................................................................................................................21
5.2.3 Starting .................................................................................................................................................23
5.2.4 Normal stopping ..................................................................................................................................23
5.2.5 Emergency stop...................................................................................................................................24
5.2.6 Mode selection.....................................................................................................................................24
5.2.7 Speed changing ...................................................................................................................................25
5.2.8 Adjustments control............................................................................................................................26
5.2.9 Failure of the power supply................................................................................................................27
5.2.10 Failure of the control circuits .............................................................................................................27
5.3 Protection against mechanical hazards ............................................................................................28
5.3.1 Stability.................................................................................................................................................28
5.3.2 Hazard of break-up during operation.................................................................................................28
5.3.3 Tool holder and tool design................................................................................................................28
5.3.4 Braking..................................................................................................................................................34
5.3.5 Devices to minimise the possibility or the effect of kickback ........................................................35
5.3.6 Work-piece supports and guides.......................................................................................................38
5.3.7 Prevention of access to moving parts...............................................................................................44
5.3.8 Workpiece clamping device................................................................................................................49
5.3.9 Safety appliances.................................................................................................................................49
5.4 Protection against non-mechanical hazards ....................................................................................50
5.4.1 Fire ........................................................................................................................................................50
5.4.2 Noise .....................................................................................................................................................50
5.4.3 Emission of chips and dust................................................................................................................51
5.4.4 Electricity..............................................................................................................................................52
5.4.5 Ergonomics and handling...................................................................................................................52
5.4.6 Pneumatics...........................................................................................................................................53
5.4.7 Hydraulics.............................................................................................................................................53
5.4.8 Electromagnetic compatibility............................................................................................................53
5.4.9 Errors of fitting.....................................................................................................................................53
5.4.10 Supply disconnecting devices ...........................................................................................................53
5.4.11 Maintenance .........................................................................................................................................54
6 Information for use ..............................................................................................................................54
6.1 Warning devices ..................................................................................................................................54
6.2 Marking .................................................................................................................................................54
6.3 Instruction handbook ..........................................................................................................................57

EN 848-1:2007 (E)
3
Annex A (normative) Determination of maximum tool spindle speeds ......................................................61
A.1 Determination of spindle speed.........................................................................................................61
Annex B (normative) Rigidity test for pressure pads, hand protectors and guiding steadies.................66
B.1 Pressure pads......................................................................................................................................66
B.1.1 Fence pressure pads...........................................................................................................................66
B.1.2 Table pressure pads............................................................................................................................68
B.1.3 Measuring equipment .........................................................................................................................69
B.1.4 Test and test requirements.................................................................................................................69
B.1.5 Measuring conditions .........................................................................................................................69
B.2 Adjustable guard (Hand protector) and guiding steady..................................................................69
B.2.1 Adjustable guard .................................................................................................................................69
B.2.2 Guiding steady.....................................................................................................................................70
B.2.3 Measuring equipment .........................................................................................................................72
B.2.4 Test .......................................................................................................................................................72
B.2.5 Measuring conditions .........................................................................................................................72
Annex C (normative) Stability test for displaceable machines....................................................................73
Annex D (informative) Use of well tried components....................................................................................74
Annex E (normative) Brake tests ....................................................................................................................75
E.1 Conditions for all tests........................................................................................................................75
E.2 Tests .....................................................................................................................................................75
E.2.1 Un-braked run-down time...................................................................................................................75
E.2.2 Run-up time..........................................................................................................................................75
E.2.3 Braked run-down time.........................................................................................................................75
Annex F (normative) Use of electronic components ....................................................................................77
F.1 General .................................................................................................................................................77
F.2 SRECS ..................................................................................................................................................77
F.2.1 Components, hardware.......................................................................................................................77
F.2.2 Safety related software .......................................................................................................................78
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of UE Directive 98/37/EC............................................................................................80
Bibliography......................................................................................................................................................83

EN 848-1:2007 (E)
4
Foreword
This document (EN 848-1:2007) 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 August 2007, and conflicting national standards shall be withdrawn at
the latest by August 2007.
This document supersedes EN 848-1:1998.
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 the Machinery Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
Organisation contributing to the preparation of this document include the European Association of
Manufacturer of Woodworking Machines "EUMABOIS".
The European Standards produced by CEN/TC 142 are particular to woodworking machines and compliment
the relevant A and B standards on the subject of general safety (see introduction of EN ISO 12100-1:2003 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, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.

EN 848-1:2007 (E)
5
Introduction
This document 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 document is a type C standard as stated in EN 12100-1:2003.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of other standards, for machines that
have been designed and built in accordance with the requirements of the provisions of this type C standard.
The requirements of this document are directed to manufacturers and their authorised representatives of
single spindle vertical moulding machines. It is also useful for designers.
This document also includes provisions and examples of information to be provided by the manufacturer to
the user.
Common requirements for tooling are given in EN 847-1:2005, EN 847-2:2001 and EN 847-3:2004.

EN 848-1:2007 (E)
6
1 Scope
This document deals with the significant hazards, hazardous situations and events as listed in Clause 4 which
are relevant to stationary and displaceable hand fed single spindle vertical moulding machines (with or without
demountable power feed unit), herein after referred to as "machines", designed to cut solid wood, chip board,
fibreboard, plywood and also these materials if they are covered with plastic laminate or edgings when they
are used as intended and under the conditions foreseen by the manufacturer.
NOTE 1 For the definition of stationary and displaceable machine see 3.2.17 and 3.2.18.
This document does not apply to:
a) machines equipped with outboard bearings;
b) machines equipped with powered movements of front extension table and/or tenoning travelling table;
c) hand held woodworking machines or any adaptation permitting their use in a different mode, i.e. bench
mounting;
NOTE 2 Hand-held motor-operated electric tools are dealt with in EN 60745-1:2003 together with EN 60745-2-17:2003.
d) machines set up on a bench or a table similar to a bench, which are intended to carry out work in a
stationary position, capable of being lifted by one person by hand. The bench can also be an integrated
part of the machine if it consists of hinged legs which can be extended down;
NOTE 3 Transportable motor-operated electric tools are dealt with in EN 61029-1:2000 together with
prEN 61029-2-8:2003.
This document is not applicable to hand fed single spindle vertical moulding machines which are
manufactured before the date of its publication as EN.
NOTE 4 Machines covered by this document are listed under A.7 of Annex IV of the Machinery Directive.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 294:1992, Safety of machinery — Safety distance to prevent danger zones being reached by the upper
limbs
EN 847-1:2005, Tools for woodworking — Safety requirements — Part 1: Milling tools, circular saw blades
EN 847-2:2001, Tools for woodworking — Safety requirements — Part 2: Requirements for the shank of
shank mounted milling tools
EN 894-1:1997, Safety of machinery — Ergonomics requirements for the design of displays and control
actuators — Part 1: General principles for human interactions with displays and control actuators
actuators — Part 2: Displays
actuators — Part 3: Control actuators

EN 848-1:2007 (E)
7
EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and components —
Hydraulics
EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and components —
Pneumatics
EN 1005-1:2001, Safety of machinery — Human physical performance — Part 1: Terms and definitions
EN 1005-2:2003, Safety of machinery — Human physical performance — Part 2: Manual handling of
machinery and component parts of machinery
EN 1005-3:2002, Safety of machinery — Human physical performance — Part 3: Recommended force limits
for machinery operation
EN 1005-4:2005, Safety of machinery — Human physical performance — Part 4: Evaluation of working
postures and movements in relation to machinery
EN 1037:1995, Safety of machinery — Prevention of unexpected start-up
EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design
and selection
EN 1837:1999, Safety of machinery — Integral lighting of machines
EN 50178:1997, Electronic equipment for use in power installations
EN 50370-1:2005, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part
1: Emission
EN 50370-2:2003, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part
2: Immunity
EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
(IEC 60204-1:2005, modified)
EN 60439-1:1999, Low-voltage switchgear and controlgear assemblies — Part 1: Type-tested and partially
type-tested assemblies (IEC 60439-1:1999)
EN 60529:1991, Degree of protection provided by enclosure (IP code) (IEC 60529:1989)
EN 61310-1:1995, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1:1995)
EN 61496-1:2004, Safety of machinery — Electro sensitive protective equipment — Part 1: General
requirements and tests (IEC 61496-1:2004, modified)
EN 61508-3:2001, Functional safety of electrical/electronic/programmable electronic safety related systems —
Part 3: Software requirements (IEC 61508-3:1998 + Corrigendum 1999)
EN 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and
programmable control systems (IEC 62061:2005)
EN ISO 3743-1:1995, Acoustics — Determination of sound power levels of noise sources — Engineering
methods for small movable sources in reverberant fields — Part 1: Comparison method for hard-walled test
rooms (ISO 3743-1:1994)

EN 848-1:2007 (E)
8
EN ISO 3743-2:1996, Acoustics — Determination of sound power levels of noise sources using sound
pressure — Engineering methods for small, movable sources in reverberant fields — Part 1: Methods 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)
— Precision methods for anechoic and semi-anechoic rooms (ISO 3745:2003)
— Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)
EN ISO 4871:1996, Acoustics — Declaration 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 discreet points (ISO 9614-1:1993)
EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement method of
emission sound pressure levels at a work station and at other specified positions — Survey method in situ
(ISO 11202:1995)
EN ISO 11202:1995/AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement
method of emission sound pressure levels at a work station and at other specified positions — Survey method
in situ (ISO 11202:1995/Cor.1:1997)
EN ISO 11204:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission
sound pressure levels at a work station and at other specified positions — Method requiring environmental
corrections (ISO 11204:1995)
EN ISO 11204:1995/AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement of
emission sound pressure levels at a work station and at other specified positions — Method requiring
environmental corrections (ISO 11204:1995/Cor.1:1997)
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)
EN ISO 11688-1:1998/AC:1998, Acoustics — Recommended practice for the design of low-noise machinery
and equipment — Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2:
Technical principles (ISO 12100-2:2003)
EN ISO 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2006)
EN ISO 13849-2:2003, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
(ISO 13849-2:2003)
EN ISO 13850:2006, Safety of machinery - Emergency stop - Principles for design (ISO 13850:2006)
ISO 7009:1983, Woodworking machines — Single spindle moulding machines — Nomenclature and
acceptance conditions
ISO 7960:1995, Airborne noise emitted by machine tools — Operating conditions for woodworking machines

EN 848-1:2007 (E)
9
3 Terms and definitions
3.1 General
For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following
apply.
3.2 Definitions
3.2.1
single spindle vertical moulding machine
hand fed machine fitted with a single vertical spindle (fixed or removable) the position of which is fixed during
machining and a horizontal table, all or part of which are fixed during operation. The spindle passes through
the table and its drive motor is situated beneath the table. The machine may have any of the following
features:
a) the facility for the spindle to be vertically adjustable relative to the table;
b) the facility to tilt the spindle;
c) the facility for fitting an additional manually operated tenoning travelling table;
d) the facility for the glass bead recovery;
e) the facility for an adjustable table insert
3.2.2
straight work
shaping of a work-piece with one face in contact with the table and a second with the fence, and where the
work starts at one end of the work-piece and continues through to the other end (see Figure 1)
Figure 1 — Example of straight work

EN 848-1:2007 (E)
10
3.2.3
curved work
machining of a curve on a work-piece by having one side in contact with the table (or if held in a jig with the jig
in contact with the table) and the other in contact with the vertical reference of a steady (see Figure 2) or ball
ring guide when using a jig
Figure 2 — Example of curved work
3.2.4
tenoning
machining of projections and slots on the end of a work-piece to facilitate the joining of work-pieces. This
includes profiled tenons (see Figure 3)
Key
1 tenon
2 slot
Figure 3 — Example of workpiece with tenon/slot

EN 848-1:2007 (E)
11
3.2.5
stopped straight work
machining of only a part of the work-piece length (see Figure 4)
Key
1 end stop to prevent kickback
Figure 4 — Example of stopped straight work
3.2.6
glass bead saw unit
work unit fitted with a saw-blade to cut out a glass bead from the machined profile of the work-piece (e.g. see
Figure 5)

EN 848-1:2007 (E)
12
Key
1 glass bead saw-blade
2 bead ledge separator
3 anti-kickback finger
4 pressure device
5 guiding channel for glass bead ledge
6 glass bead ledge
7 workpiece
8 fixed safeguard for glass bead saw blade
9 automatic guard for glass bead saw blade
10 fence
11 feed direction
Figure 5 — Example of glass bead recovery unit
3.2.7
hand feed
manual holding and/or guiding of the work-piece. Hand feed may include the use of a hand operated carriage
on which the work-piece is placed manually or clamped and the use of a de-mountable power feed unit
3.2.8
de-mountable power feed unit
power feed mechanism which is mounted on the machine so that it can be moved from its working position to
a rest position and vice versa without the use of a spanner or similar additional device
3.2.9
speed range
range between the lowest and the highest rotational speed for which the tool spindle or tool is designed to
operate
3.2.10
kickback
particular form of ejection describing the uncontrolled movement of the work-piece, parts of it or parts of the
machine opposite to the direction of feed during processing

EN 848-1:2007 (E)
13
3.2.11
anti-kickback device
device which either reduces the possibility of kickback or arrests the motion during kickback of the work-piece,
parts of it or parts of the machine
3.2.12
removable spindle
tool spindle capable of being changed without removing the main spindle bearings
3.2.13
machine actuator
power mechanism used to effect motion of the machine
3.2.14
information of the supplier
statements, sales literature, leaflets or other documents in which a manufacturer (or supplier) declares either
the characteristics of e.g. a material or product or the conformity of the material or product to a relevant
standard
3.2.15
run-up time
elapsed time from the actuation of the start control device until the spindle reaches the selected speed
3.2.16
run-down time
elapsed time from the actuation of the stop control device to spindle stand still
3.2.17
stationary machine
machine designed to be located on or fixed to the floor or other parts of the structure of the premises and to
be stationary during use
3.2.18
displaceable machine
machine which is located on the floor, stationary during use and equipped with a device, normally wheels,
which allows it to be moved between locations
3.2.19
safety related electrical control system (SRECS)
electrical that is part of the system supplied by the manufacturer whose failure can result in an immediate
increase of the risk(s) (3.2.4 of EN 62061:2005)
3.2.20
embedded software
software that is part of the system supplied by the manufacturer that is not normally accessible for
modification
NOTE 1 Firmware or system software are examples of embedded software (see 3.2.47 of EN 62061:2005).
NOTE 2 Manufacturer means manufacturer of the system.
NOTE 3 For example the operating system of a speed monitoring device.
3.2.21
application software
software specific to the application that is specifically implemented by the designer of the SRECS, generally
containing logic sequences, limits and expressions that control the appropriate inputs, outputs, calculations
and decisions necessary to meet the SRECS functional requirements (see 3.2.46 of EN 62061:2005)

EN 848-1:2007 (E)
14
NOTE For example the PLC program to run a machine.
3.3 Terminology
The main parts of the machine and their terminology are shown in Table 1 and Figures 6 a), 6 b), 6 c) and 6 d).
Figure 6 a) — Example of a single spindle vertical moulding machine equipped for straight work

EN 848-1:2007 (E)
15
Figure 6 b) — Example of a single spindle vertical moulding machine equipped for curved work
Figure 6 c) — Example of tool safeguarding for a single spindle vertical moulding machine equipped
for tenoning with transparent adjustable guards

EN 848-1:2007 (E)
16
Figure 6 d) — Example of tool safeguarding for a single spindle vertical moulding machine equipped
for tenoning with transparent self adjusting guard
Figure 6 — Single spindle vertical moulding machine terminology
Table 1 — Main components of single spindle vertical moulding machines
Reference number Terminology
1 Main frame
2 Speed indicator
3 Spindle lock
4 Start and stop controls
5 Tool
6 Table rings
7 Straight work guard
8 Fence plates
9 Enclosure
10 Chip and dust extraction outlet
11 Curved work guard
12 Bonnet guard
13 Guiding steady
14 Travelling table
15 Work-piece clamping device
16 Adjustable guard
17 De-mountable power feed unit
18 Push stick
19 Guards fixed to the travelling table
20 Table extension
21 Adjustable end stop

EN 848-1:2007 (E)
17
4 List of significant hazards
This clause contains the significant hazards, hazardous situations and events (see EN 1050:1996), as far as
they are dealt with in this document, identified by risk assessment as significant for the machines as defined in
the scope and which require action to eliminate or reduce the risk. This document deals with these significant
hazards by defining safety requirements and/or measures or by reference to relevant standards:
These hazards are listed in Table 2 in accordance with Annex A of EN 1050:1996.
Table 2 — List of significant hazards
No
Hazards, hazardous situations and
hazardous events EN ISO 12100
Relevant
clauses of
this
document
Part1:2003 Part 2:2003
1 Mechanical hazards related to
- machine parts or workpiece due to:
a) shape 5.3.3, 5.3.5,
5.3.6, 5.3.7,
5.3.8
b) relative location 5.2.2, 5.3.5,
5.3.6
c) mass and stability (potential energy
of elements which may move under the
effect of gravity)
5.3.1, 5.3.7
d) mass and velocity (kinetic energy of
elements in controlled or uncontrolled
motion)
5.2.8, 5.3.5,
5.3.8
e) mechanical strength
4.2 4.2.1, 4.2.2,
5
5.3.3, 5.3.5,
5.3.6, 5.3.7
- accumulation of energy inside the machine by:
f) elastic elements (springs), or 5.3.7
g) liquids or gases under pressure
4.2 4.10, 5.5.4
5.2.9, 5.4.6,
5.4.7
(to be continued)

EN 848-1:2007 (E)
18
Table 2 — List of significant hazards (continued)
EN ISO 12100No
hazardous events
Part1:2003 Part 2:2003
Relevant
clauses of
this
document
1.1 Crushing hazard 5.3.4, 6.3
1.3 Cutting or severing hazard 5.3.3, 5.3.6,
5.3.7.1
1.4 Entanglement hazard 5.3.3, 5.3.7
1.5 Drawing in or trapping hazard 5.3.7
1.6 Impact hazard
4.2.1
5.3.5
2. Electrical hazards
2.1 Contact of persons with live parts
(direct contact)
4.3 4.9, 5.5.4 5.4.4
2.2 Contact of persons with parts which
have become live under faulty
conditions ( indirect contact)
4.3 4.9 5.4.4
4. Hazards generated by noise, resulting in:
4.1 Hearing loss (deafness), other
physiological disorders (loss of balance,
loss or awareness)
4.5 4.2.2, 5 5.4.2
7. Hazards generated by materials and substances ( and their constituent)processed, or
used by the machinery:
7.1 Hazards from contact with or inhalation
of harmful fluids and dusts
4.8 4.3b, 4.4 5.4.3
7.2 2 Fire hazard 4.8 4.4 5.4.1
8. Hazards generated by neglecting ergonomic principles in machine design as:
8.1 Unhealthy postures or excessive efforts 4.9 4.7, 4.8.2,
4.11.12,
5.5.5, 5.5.6
5.2.2, 5.3.7
8.2 Hand/arm or foot/leg anatomy 4.9 4.8.3 5.3.6, 5.3.7
(to be continued)

EN 848-1:2007 (E)
19
Table 2 — List of significant hazards (concluded)
EN ISO 12100No
hazardous events
Part1:2003 Part 2:2003
Relevant
clauses of
this
document
8.6 Human error, human behaviour 4.9 4.8, 4.11.8,
4.11.10,
5.5.2, 6
5.2.6,
5.3.3.6,
5.3.4, 6.3
8.7 Design, location or identification of
manual controls
4.8.7, 4.11.8 5.2.2
9 Hazard combination 4.11 5.2.6
10. Unexpected start-up, unexpected overrun/overspeed (or any similar malfunction) from
10.1 Failure/ disorder of the control system 4.11, 5.5.4 5.2.6, 5.2.9
10.2 Uncontrolled restoration of energy
supply after an interruption
4.11.4 5.2.8
10.3 External influences on electrical
equipment
4.11.11 5.4.8,
Annex F
10.5 Errors in the software 4.11.7 Annex F
10.6 Errors made by the operator (due to
mismatch of machinery with human
characteristics and abilities, see 8.6)
4.9 4.8, 4.11.8,
4.11.10,
5.5.2, 6
5.4.5, 5.4.10,
6.3
11 Impossibility of stopping the machine in
the best possible conditions
4.11.1,
4.11.3, 5.5.2
5.2.4, 5.2.5
12 Variation in the rotational speed of tools 4.2.2, 4.3 5.2.7
13 Failure of the power supply 4.11.1,
4.11.4
5.2.8
14 Failure of the control circuit 4.11, 5.5.4 5.2.9, 5.2.10
15 Errors of fitting 4.9 4.7, 6.5 6.3
16 Break-up during operation 4.2.2 4.3 5.3.2
17 Falling or ejected objects or fluids 4.2.2 4.3, 4.10 5.3.2, 5.3.3,
5.3.5,
18 Loss of stability/overturning of
machinery
4.2.2 5.2.6 5.3.1

EN 848-1:2007 (E)
20
5 Safety requirements and/or measures
5.1 General
The machine shall comply with the safety requirements and/or protective measures of Clause 5.
NOTE 1 In addition, the machine should be designed in accordance with the requirements of the principles of
EN ISO 12100:2003 (parts 1 and 2) for hazards relevant but not significant, which are not dealt with by this document (e.g.
sharp edges of the machine frame).
NOTE 2 For guidance in connection with risk reduction by design, see Clause 4 of EN ISO 12100-2:2003, and for
safeguarding measures, see Clause 5 of EN ISO 12100-2:2003.
5.2 Controls
5.2.1 Safety and reliability of control systems
5.2.1.1 General
For the purpose of this document, safety related part of a control system means the system from the initial
device, e.g. actuator or position detector or sensor up to and including the power control element of the final
machine actuator, e.g. motor or brake. Safety related parts of the control system of this machine comprise
parts concerning the following functions and they shall fulfil the requirements of the categories given below in
accordance with the requirements of EN ISO 13849-1:2006:
 for starting the rotation of the tool spindle: category 1 (see 5.2.3);
 for normal stopping: category 1 (see 5.2.4);
 for emergency stopping: category 1 (see 5.2.5);
 for tool spindle, fence, adjustable table insert adjustments movements if power driven: category B
(see 5.2.8.1, 5.2.8.2);
 for monitoring of tool spindle speed :category 1 or 2 (see 5.2.7);
 for enabling power driven adjustments: category 1 (see 5.2.8.1, 5.2.8.2);
 for interlocking: category 1 or 3 (see 5.2.7 and 5.3.7.2);
 for interlocking with guard locking: category 1 or 3 (see 5.3.7.1.1 and 5.3.7.2);
 for mode selection: category 1 (see 5.2.6);
 for braking: category B, 1 or 2 (see 5.3.4.1);
 for brake release: category B (see 5.3.4.2);
 for workpiece clamping: category 1 (see 5.3.8).
Where more than one category is given, further information about the necessary type is specified in the
quoted clauses.
Where category B is required all categories fulfil the requirements, where category 1 is required categories 3
and 4 also fulfil the requirement. Where category 2 is required categories 3 and 4 also fulfil the requirement,
where category 3 is required category 4 also fulfils the requirement.

EN 848-1:2007 (E)
21
NOTE 6.3 of EN ISO 13849-1:2006 give useful information on combination of safety-related parts to the same or
different categories.
Verification: By checking the relevant drawings and/or circuit diagrams and inspection of the machine.
5.2.1.2 Use of well-tried components and protective devices
5.2.1.2.1Well-tried components
Components are considered well tried if they comply with 6.2.4 of
EN ISO 13849-1:2006 (see Annex D).
NOTE 1 Well-tried electrical components are listed in Table D.3 of EN ISO 13849-2:2003.
NOTE 2 EN 13849-2:2003 gives useful information on assessment of well-tried components, possible exclusion of
faults etc.
Verification: By checking the relevant drawings and/or circuit diagrams and inspection of the machine.
5.2.1.2.2Protective devices
Protective devices shall be in accordance with the specific standards. For the devices listed below the
following requirements apply:
a) magnetic/proximity switches shall be in accordance with the requirements of 6.2 of EN 1088:1995 and
the related control system shall conform to category 3 in accordance with the requirements of
EN ISO 13849-1:2006;
b) a component failure shall not cause an unexpected movement (starting), a change of running
conditions during operation (adjustment of the speed or of a powered movement) and a failure of a
commanded stopping. Well known solutions such as monitoring, redundancy shall be used to achieve
category 3 in accordance with the requirements of EN ISO 13849-1:2006.
c) if a time delay is used it shall be either of fail safe technique e.g. of capacity type or shall conform to
the requirements of category 3 in accordance with the requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings and/or circuit diagrams, inspection of the machine and relevant
functional testing of the machine.
NOTE For the components characteristics, confirmation from the components' manufacturers can be useful.
5.2.1.3 Use of electronic components
If electronic components are used the requirements given in Annex F shall be met.
Verification: By checking the relevant drawings and/or circuit diagrams, inspection of the machine,
measurement and relevant functional testing of the machine.
5.2.2 Position of controls
The main electrical control actuators, for starting, normal stopping, emergency stop (if required - see 5.2.5),
spindle adjustment (if fitted - see 5.2.8), direction of rotation (if fitted - see 5.3.3.6) and mode selection (if
required - see 5.2.6) shall be located as follows:
For stationary and displaceable machines with or without a projecting sliding table and for machines with an
integral sliding table:
a) at the operator's position(s) (see 6.3 k)) and

EN 848-1:2007 (E)
22
b) below the table located in a fixed position on the front side of the machine at a distance of at least 50 mm
from the table top and more than 600 mm above the floor (see Figure 7), or
c) on the front side of a fixed control panel located as shown in shaded area of Figure 7:
1) its front face is at a distance from the front edge of the table not exceeding 700 mm;
2) its upper surface is at a distance from the floor level not exceeding 1 800 mm.
Dimensions in millimetres
Key
1 location band for controls
2 fixed control panel
3 control panel location area
Figure 7 — Position of controls
Mechanical controls shall be reachable from the operator's position and not be located at the rear side of the
machine.
Verification: By checking the relevant drawings and/or circuit diagrams, measurements, inspection of the
machine and functional testing of the machine.

EN 848-1:2007 (E)
23
5.2.3 Starting
The control system shall be designed so that starting or restarting of the tool spindle shall only be possible if
all guard systems with interlocking functions as described in 5.3.7 are in place and functional. For non
interlocked guards, tool spindle and guides adjustments' provisions before starting see 6.3 k).
Start or restart shall only be possible by actuation of the start control device provided for that purpose.
If fitted with a power feed unit and/or a glass bead saw unit the following requirements apply: Starting of a
power feed unit shall only be possible when the tool spindle and saw blade of the glass bead saw unit are
running or when the tool spindle is running and the glass bead saw unit is retracted or dismounted.
If a glass bead saw unit and/or powered adjustment of the fence and/or adjustable table insert are provided,
starting of the saw blade of a glass bead saw unit and/or powered adjustment of the fence and/or adjustable
table insert, the requirements of 5.2.8, 5.3.3.4 and 5.3.6 apply.
For electrically operated machines the requirements of 9.2.5.2 of EN 60204-1:2006 apply but 9.2.4 of
EN 60204-1:2006 does not apply.
The safety related part of the control system for starting the rotation of the spindle shall conform to category 1
in accordance with the requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings and/or circuit diagrams, inspection of the machine and
5.2.4 Normal stopping
A stop control shall be fitted where by the machine and – if fitted - a demountable power feed unit and/or a
glass bead saw unit can be brought safely to a complete stop. The stopping action shall include disconnection
from energy supply of all actuators.
The normal stopping sequence shall be:
a) cut power to a socket, if provided, for the connection of a de-mountable power feed unit, to the spindle
positioning actuators, to the spindle drive motor and apply the brake (where fitted- see 5.3.4);
b) cut power to the brake, (if electrical brake is fitted), after the spindle has come to rest e.g. by using a time
delay in accordance with 5.2.1.2.2 c).
The machine shall stop directly from each speed.
If the machine is fitted with a spring operated mechanical brake, the normal stop control system shall conform
to category 0 in accordance with the requirements of 9.2.2 of EN 60204-1:2006.
If the machine is fitted with any other type of brake e.g. electrical brake the normal stop control system shall
conform to category 1 in accordance with the requirements of 9.2.2 of EN 60204-1:2006 (also see 5.3.4.1).
The safety related part of the control system for normal stopping shall conform to category 1 in accordance
with the requirements of EN ISO 13849-1:2006.
Machines fitted with a side tenoning travelling table or a front extension table shall be provided with an
additional normal stop control if the machine is only fitted with a normal stop or an additional emergency stop
control if the machine is fitted with an emergency stop control, in both cases the device shall be located on the
travelling table or its support.
The design of the control circuits shall be such as to satisfy the normal stopping sequence. If a time delay
device is used the time delay shall be at least equal to the maximum braked run-down time. The time delay
shall be fixed or the time delay adjustment device shall be sealed.

EN 848-1:2007 (E)
24
Verification: By checking the relevant drawings and circuit diagrams, inspection of the machine, and functional
testing of the machine.
5.2.5 Emergency stop
Machines with more than one machine actuator shall be fitted with an emergency stop control. The
emergency stop control device shall be at any time of self latching type. When operated, the emergency stop
control shall disconnect power from all machine actuators except workpiece clamping and actuate the brake (if
provided - see 5.3.4) in accordance with the requirements of 9.2.5.4.2 of EN 60204-1:2006.
If the machine is fitted with a spring operated mechanical brake the emergency stop control system shall
conform to category 0 in accordance with the requirements of 9.2.5.4.2 of EN 60204-1:2006 and category 0 in
accordance with the requirements of 4.1.4 of EN ISO 13850:2006.
If the machine is fitted with any other type of brake e.g. electrical brake and/or a power operated clamping
device the emergency stop control system shall conform to category 1 in accordance with the requirements of
9.2.5.4.2 of EN 60204-1:2006 and category 1 in accordance with the requirements of 4.1.4 of EN ISO
13850:2006.
The emergency stop sequence shall be:
a) cut power at the same time:
 to the demountable power feed unit if provided e.g. by cutting power to the socket for the connection of a
demountable power feed unit;
 to the spindle positioning actuators;
 to the spindle drive motor;
 and apply the brake (where fitted-see 5.3.4);
b) cut power to the brake, (if electrical brake is fitted), after the spindle has come to rest e.g. by using a time
delay in accordance with 5.2.1.2.2 c);
The emergency stop shall not cause the work-piece to become un-clamped unless the tenoning travelling
table is in the rest position or the spindle drive motor has come to a safe stop.
The safety related part of the control system for emergency stop shall conform to category 1 in accordance
Verification: By checking the relevant drawings and/or circuits diagrams, inspection of the machine and
5.2.6 Mode selection
Where the machine is capable of being adjusted, either under manual or electronic pre-set control, a mode
selection switch in accordance with the requirements of 9.2.3 of EN 60204-1:2006 shall be provided to select
between manual and electronic pre-set modes or an initiation device (e.g. push button) shall be provided for
enabling the movements (see 5.2.8, 5.3.3.4 and 5.3.6).
The mode selection switch shall be in accordance with the following requirements:
a) its control system shall override all other control systems except the emergency stop;
b) it shall be lockable e.g.
1) by a key-operated switch, or

EN 848-1:2007 (E)
25
2) via limited access to related numerically controlled functions by means of a password;
c) changing the mode shall not initiate any movement of the machine.
The safety related part of the control system for mode selection shall conform to category 1 in accordance
NOTE See 9.2.3 of EN 60204-1:2006.
functional testing of the machines.
5.2.7 Speed changing
5.2.7.1 General
On machines with more than one spindle speed, the selected spindle speed shall be indicated at the work
station.
On machines with varying the tool spindle speed by changing the belts on the pulleys the control system for
tool spindle speed indication/detection shall conform to the following requirements:
 be category 1 in accordance with the requirements of EN ISO 13849-1:2006 if using electromechanical
means, or
 if one sensor per belt position is used only one belt position shall be indicated/detected at any one time or
an error shall be indicated.
On machines fitted with a control device for infinitely varying the tool spindle speed (e.g. a static frequency
inverter) and/or stored speed values related to the selected tool the control device shall be such that the
actual speed shall not exceed the selected speed by more than 10 % (e.g. by means of an auxiliary electrical
circuit). The control system for speed changing shall conform to category 2 in accordance with the
requirements of EN ISO 13849-1:2006. The actual speed of the tool spindle shall be compared with the
selected speed continuously. The processor used for this purpose shall have an external watch dog function.
If the actual speed exceeds the selected speed by more than 10 % the tool spindle motor shall stop
automatically. This stop shall be of category 0 in accordance with the requirements of 9.2.2 of EN 60204-
1:2006. In addition the following measures against loss or falsification of data shall be taken:
a) measures against loss of the data for tools and selected speed stored in the machine control if stored
data result in an automatic selection of the intended tool spindle speed:
1) the safety related data for the machine tools shall be stored either in 2 independent memory
chips or stored two times in one single chip (one time inverse);
2) after input of the safety related data for the tools the data shall be confirmed by the operator;
3) the two data shall be compared automatically at each switching on of the isolator and at each
fetch of the data. If the two data are not identical it shall be impossible to start the spindle drive motor
or if running the spindle drive motor shall be stopped and a warning signal shall be given;
4) for monitoring of failures the processor comparing the data shall have an external watch dog
function;
b) measures against falsification in data transfer between manual control, data stored in the machine
control, display for the data and control of the inverter:
1) the selected tool spindle speed shall be stored in the control system for the speed change;

EN 848-1:2007 (E)
26
2) the selected tool spindle speed transmitted to the control of the inverter shall be read back and
monitored on the display for checking by the operator. In case where the speed signals differ the
start-up of the tool spindle shall be prevented.
The category for the control system for interlocking and for tool spindle speed indication/detection shall be in
accordance with the requirements of EN ISO 13849-1:2006 and at least:
1) category 1 if by electromechanical means;
2) category 3 if electronic components are used.
NOTE Machines designed to be used with shank mounted tools with shank diameters not exceeding 20 mm can
have a possible spindle speed exceeding 15 000 min
-1
.
relevant functional testing of the machine.
5.2.7.2 Speed limiting device for tenoning
Machines designed to be fitted with a travelling table for tenoning which are capable of tool spindle speeds in
excess of 4 800 min
-1
, shall have a speed limiting device which will prevent the spindle rotating faster than 4
800 min
-1
whilst tenoning with tooling of a greater diameter than 275 mm. This can be achieved by
interlocking the guarding system described in 5.3.7.1.4.2 with the tool spindle drive.
The category for the control system for interlocking and for speed limiting device shall be in accordance with
the requirements of EN ISO 13849-1:2006 and at least:
1) category 1 if by electromechanical means;
2) category 3 if electronic components are used.
5.2.8 Adjustments control
5.2.8.1 Power driven adjustments under hold-to-run control
For manual adjustments of spindle height and/or inclination the requirements of 5.3.3.4 apply.
For manual adjustments of fence the requirements of 5.3.6.2.2 apply.
For manual adjustments of the adjustable table insert the requirements of 5.3.6.1.2.2 apply.
Where the fence and/or the adjustable table insert and/or the tool spindle (rotating or not rotating) are capable
of power driven adjustments under hold-to-run control, these adjustments shall be effected, one movement at
a time, by means of a hold-to-run control device with a stop control in the vicinity taking account of basic
principles in of 4.11.8 b) of EN ISO 12100-2:2003 and the corresponding safety related part of the control
system for each movement speed shall conform to category B in accordance with the requirements of
EN ISO 13849-1:2006. The adjustment speed shall not exceed 10 mm s
-1
or 5° s
-1
.
The control system for initiating and stopping of any movement shall conform to category 1 in accordance with
the requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings and or circuit diagrams, measures, inspection of the machine
and functional testing of the machine.

EN 848-1:2007 (E)
27
5.2.8.2 Automatic power driven adjustments
Automatic power driven adjustments of:
1) the tool spindle not rotating for inclination adjustment and/or
2) the tool spindle rotating for vertical adjustment and/or
3) the fence and/or
4) the adjustable table insert
may be provided where:
a) only two simultaneous movements at a time are possible;
b) the maximum adjustment speed is 10 mm s
-1
or 5° s
-1
;
c) any part of the machine which can touch the tool which ever the position of the later is (i.e. adjustable
table insert, fence plates table rings) are made of chipable material (e.g. wood, plastic or light alloy);
d) start of automatic adjustments is only possible after actuation of an initiation control device (e.g. push
button) the control circuit of which conforms at least to category 1 in accordance with the requirements of
EN ISO 13849-1:2006 in conjunction with a start control of the programmed cycle for all movements;
e) at the end of the programmed movement power is cut to the corresponding machine actuators. A time
delay device conforming to 5.2.1.2.2 c) may be used for cutting power with time delay corresponding to
maximum adjustment time. Either the time delay shall be fixed or the time delay adjustment device shall be
sealed. A new initiation shall be necessary to perform an additional adjustment;
f) power driven inclination adjustments is interlocked with the power supply for the spindle rotation and the
corresponding safety related part of the control system conforms at least to category 1 in accordance with the
requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings and or circuit diagrams, measures, inspection of the machine
and functional testing of the machine.
5.2.9 Failure of the power supply
In the case of supply interruption for electrically driven machines, automatic restart after the restoration of the
supply voltage shall be prevented in accordance with the requirements of paragraphs 1 to 3 of 7.5 of
EN 60204-1:2006.
functional test of the machine.
5.2.10 Failure of the control circuits
The requirements of Clause 6 of EN 1037:1995 apply and in addition:
The control circuits shall be designed so that a break in any circuit (e.g. broken wire, ruptured pipe or hose)
will not result in the loss of a safety function e.g. involuntary start of the machine, tool/saw blade unclamping
or loss of workpiece clamping (if fitted) in accordance with EN 60204-1:2006 and EN 983:1996.
Also see 5.2.1.

EN 848-1:2007 (E)
28
functional test of the machine.
5.3 Protection against mechanical hazards
5.3.1 Stability
Machines and auxiliary equipment shall be provided with a facility for fixing them to the floor, bench or other
stable structure e.g. by providing holes in the machine frame or the necessary fixing devices (see also 6.3 j)).
Displaceable machines fitted with wheels shall have the facilities to make them stable during cutting. Such
facilities are e.g.:
a) brakes for the wheels, or
b) a combination of wheels and stabilisers, or
c) a device to retract the wheels from the floor.
Displaceable machines shall be subject of the stability test.
Verification: By checking the relevant drawings or inspection on the machine and performing the stability test
described in Annex C.
5.3.2 Hazard of break-up during operation
In order to minimise the probability of break-up during operation the requirements of 5.3.3 apply and to reduce
the effect of break-up during operation the requirement of 5.3.7.3 apply.
See also 6.3 f), h) and k).
Verification: By checking the relevant drawings.
5.3.3 Tool holder and tool design
5.3.3.1 Geometrical performance
The tool spindle shall be manufactured in accordance with G10 and G11 of ISO 7009:1983.
The tool spindle shall be designed so as to prevent mounting of cutter blades.
Verification: By checking the relevant drawings, inspection of the machine and measurement. For machines
designed to use shank mounted tools the measurement G10 and G11 of ISO 7009:1993 shall be performed
on the clamped shank of the shank mounted tool.
5.3.3.2 Strength
The tool spindle shall be manufactured in steel with an ultimate tensile strength of at least 580 N mm
-2
.
The choice of the spindle speed shall meet the requirements of Annex A.
Verification: By checking the relevant drawings, tensile strength, measurement, inspection on the machine.
NOTE For the ultimate tensile strength, confirmation from the manufacturer of the material can be useful.

EN 848-1:2007 (E)
29
5.3.3.3 Dimensions for spindles and tools
Tools shall comply to EN 847-1:2005 and /or EN 847-2:2001.
Acceptable dimensions for spindles and tools are given in Table 3.
Table 3 — Spindle dimensions
Spindle diameter d Maximum useable
length
Maximum tool
diameter
d1 g6 of spindle from the
shoulder l1
(that can be mounted
in the guard)
(see Annex A) (see Annex A) d2
Single Removable Shaping Tenoning
piece
spindle
spindle
20
a
80 80 150 160
30
b
140 140 250 300
40
c
180 160 250 350
50 220 160 275 400
a Values given for d1 = 20 mm are also valid for spindle diameters larger than
20 mm and smaller than 30 mm.
b Values given for d1 = 30 mm are also valid for spindle diameters larger than
c Values given for d1 = 40 mm are also valid for spindle diameters larger than
Verification: By checking the relevant drawings, inspection of the machine and measurement.
5.3.3.4 Spindle adjustment
5.3.3.4.1Manual height adjustment
For machines where the tool spindle is manually adjustable in height with the tool spindle rotating or not
rotating, the adjustment device shall be a self locking system. The machine shall be equipped with an
indicator to show incremental vertical movement of the spindle.
With the tool spindle set in a vertical position, and a force of 300 N applied vertically downwards on its
exposed end, the change in tool spindle height shall be less than 0,5 mm.
5.3.3.4.2Manual inclination adjustment
Where the tool spindle is capable of being inclined with the tool spindle rotating or not rotating, the machine
shall be equipped with an indicator to show its degree of inclination. The adjustment device shall be self
locking.
With the tool spindle set in a vertical position, and a force of 300 N applied horizontally at its exposed end, the
inclination of the tool spindle shall not exceed 1°.

EN 848-1:2007 (E)
30
5.3.3.5 Spindle locking
If it is necessary to hold the spindle stationary (e.g. for tool changing) a spindle locking device (e.g. blocking
bar or fork) shall be provided as follows:
a) machines with a table bore diameter ≥ 190 mm shall have an integral locking device;
b) machines with a table bore diameter < 190 mm shall have an integral or non integral locking device.
When a blocking device is used it shall prevent tool spindle rotation and shall not be deformed after starting
the spindle drive motor, with the blocking device in place.
Verification: By checking the relevant drawings, measurement, inspection of the machine and functional
5.3.3.6 Direction of rotation
When the machine is equipped with a tool spindle which is capable of rotating in only one direction the spindle
shall always rotate in an anticlockwise direction when viewed from the top.
Where tool spindles are designed to run in two directions of rotation the following requirements shall be met:
a) a direction of rotation selection device shall be fitted. See 5.2.2 for the position of this device;
b) a visible warning device shall inform the machine operator when the clockwise direction of rotation is
selected;
c) the colour of the warning device shall be yellow. The visible warning device may be supplemented by an
audible one;
d) operation of the direction of rotation selection device shall not initiate spindle start up;
e) the direction of rotation selection device shall be either:
1) a two position selector fitted with a blocking device such that:
i) the “normal” position, without blocking, corresponds to the anticlockwise direction of
rotation;
ii) the “non-normal” position, with blocking, corresponds to the clockwise direction of rotation;
iii) selection of the clockwise direction of rotation shall only be possible after manual override of
the blocking device;
iv) the direction of rotation selection device shall indicate the selected direction of rotation and be
consistent with it, or
2) a three position selector, with a neutral position without a blocking device, such that only if the
machine has been started in the clockwise direction of rotation, as soon as it is switched off the
manual control actuator of the direction of rotation selection device returns automatically to its neutral
position. Any further selection of the direction of rotation shall require voluntary operation of the
selection device, or
3) a combination of manually operated push buttons such that:
i) the anticlockwise direction of rotation is started by the start button of the spindle drive motor;

EN 848-1:2007 (E)
31
ii) the clockwise direction of rotation is started by the start button of the spindle drive motor
together with an initiation control device (e.g. push button) which is also positioned so that for starting
the spindle drive motor both hands are necessary.
See also 6.3 k 4 ii).
5.3.3.7 Spindle rings
The machine shall be equipped with a set of spindle rings having a minimum wall thickness of 9,75 mm and a
tolerance of H7 on their internal diameter d1. The spindle rings shall be capable of covering the whole useable
length of the spindle. Tool spindles designed only for use shank mounted tools need not to be equipped with a
set of spindle rings.
Spindle rings shall be manufactured from steel having an ultimate tensile strength of at least 580 N mm
-2
.
The spindle ring set shall be subjected to a camming test. The camming shall not exceed 0,1 mm, when
measured on the test disc at a diameter of 100 mm with the spindle ring set assembled using the same torque
as for tool mounting (see Figure 8).
The permissible deviation of the run-out of the test disc shall not exceed 0,01 mm.
Key
1 dial gauge
Figure 8 — Spindle ring set, camming test configuration
Verification: By checking the relevant drawing, measurements (see Figure 8) and inspection of the machine.
NOTE For the steel tensile strength confirmation from the steel component manufacturer can be useful.

EN 848-1:2007 (E)
32
5.3.3.8 Tool fixing device
5.3.3.8.1Tool spindle
The tool spindle for bore mounted tools shall be fitted with a tool fixing device which shall prevent relative
movements between the ring and the spindle (see Figure 9) e.g.:
a) a lock-nut with an integral spindle ring (see Figure 9 a));
b) a spindle screw with an integral spindle ring;
c) a spindle screw with a separate spindle ring designed so that clamping is not possible without this ring
(see Figure 9 b)).
For machines designed to use shank mounted tools the clamping unit shall provide a minimum clamping
length in accordance with Table 3 of EN 847-2:2001.
The system for shank clamping shall be capable of clamping shanks with different diameters, e.g. by changing
the clamping inserts (see Figure 9 c) and 9 d)).
Verification: By checking the relevant drawings and inspection of the machine.
Figure 9 a) — Example of spindle nut
Figure 9 b) — Example of spindle screw

EN 848-1:2007 (E)
33
Figure 9 c) — Example of spindle for shank mounted tool
Figure 9 d) — Clamping insert (collet) for shank mounted tool
Figure 9 — Examples of tool fixing devices

EN 848-1:2007 (E)
34
5.3.3.8.2Glass bead saw blade
Two saw flanges (or in the case of flush mounted saw blade, a single flange) shall be provided for the saw
spindle. The diameter of all flanges shall be at least D/6 (where D = the diameter of the largest saw blade for
which the machine is designed).
For flanges other than those for flush mounted saw blade the clamping surface at the outside part of the
flanges shall be flat over a width of at least 5 mm and be recessed to the centre (see Figure 10). Both outside
diameters shall be within a tolerance of ± 1 mm. In addition there shall be a positive connection either
between the saw blade and the rear flange fixed to the saw spindle or between the front flange and the saw
spindle, e.g. a key.
Figure 10 — Saw flange detail
Verification: By checking relevant drawings, inspection of the machine, measurement and functional testing of
the machine.
5.3.4 Braking
5.3.4.1 General
An automatic brake shall be provided for the tool spindle where the un-braked run-down time exceeds 10 s.
The braked rundown time shall not exceed 10 s or where the run-up time exceeds 10 s it shall not exceed the
run-up time and in no case exceed 20 s.
Where a mechanical brake is fitted, the last paragraph of 9.3.4 of EN 60204-1:2006 does not apply and the
following requirements shall be met:
a) it shall not be possible to release the brake during the spindle run-down time (e.g. by a time delay
between control actuation and brake release);
b) the mechanical brake life and performance data shall be given. (See 6.3 q)).
For electrical braking systems, reverse current injection braking shall not be used.

EN 848-1:2007 (E)
35
The safety related part of the control system for braking shall conform to category 1 in accordance with the
requirements of EN ISO 13849-1:2006.
Where electric braking systems containing electronic components are used, the control system for braking
shall be designed in accordance with the requirements of category 2 of EN ISO 13849-1:2006. The control
system shall be effective also in case of overload and shall be tested automatically periodically, e.g. by
monitoring the braked run down time and/or by monitoring the braking current circuit during starting (short
braking).
The test shall:
1) be independent from the basic control system for braking;
2) be independent from the intention of the operator;
3) be performed at least once within every 8 h of machine running.
A negative test shall be indicated. Where the test is negative more than three times in sequence, it shall not
be possible to operate the machine.
As an exception to 5.2.1, a simple electronic brake (not using PLC's) designed in category B in accordance
with the requirements of EN ISO 13849-1:2006 is acceptable if the probability of a failure in high demand
mode (PFH) is less than 3 × 10
-6
h
-1
.
For calculating the probability of a failure in high demand mode (PFH) for a simple electronic brake
component with no fault tolerance and no testing capability (category B) the procedure described in Annex D
of EN ISO 13849-1:2006 shall be used.
When the inverter is used also to control the braking function, this function shall be guaranteed even in case
of overload.
Verification: For the determination of un-braked run-down time, run-up time and braked run-down time, if
relevant, see the appropriate tests given in Annex E.
5.3.4.2 Brake release
Where a control is provided to release the spindle brake in order to enable rotation by hand and adjustment of
the tool, release of the brake shall only be possible when the spindle has stopped turning (e.g. by a time delay
between control actuation and brake release).
It shall not be possible to start the machine before the control for the spindle brake has been reset. Reset of
the control for brake shall not initiate a start-up of the machine.
The safety related part of the control system for brake release shall conform to category B in accordance with
the requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings, inspection of the machine and functional testing of the
machine.
5.3.5 Devices to minimise the possibility or the effect of kickback
Provision shall be made for the fixing (e.g. fixing holes or “T” slots) of anti-kickback devices (e.g. adjustable
end stops) to the fence plates or the extension table (see 5.3.9). “T” slots shall be parallel to the direction of
feed and fixing holes shall not exceed 12 mm in diameter.
For fixing the extension table to the machine table, fixing holes shall be provided on both sides of the table.

EN 848-1:2007 (E)
36
When fitted with a glass bead saw unit (see Figure 5), the machine shall be equipped with:
a) a bead ledge separator. It shall be manufactured from steel with an ultimate tensile strength of
580 N mm
-2
or of a comparable material, have flat sides (within 0,1 mm per 100 mm) and shall have a
thickness less than the width of cut (kerf) and at least 0,2mm greater than the saw blade plate (see Figure 11);
b) a device to guide the bead ledge, for example a guiding channel (see Figure 5);
c) a pressure pad located between the saw blade and the anti kick-back finger (see Figure 5);
d) a device to avoid or minimise the risk of kick-back of the bead ledge, for example an anti-kickback finger
(see Figure 5). If an anti-kickback finger is fitted it shall be designed in accordance with the following
requirements:
1) it shall be located after the glass bead saw-blade in the direction of the feed;
2) it shall be made from steel with an ultimate tensile strength of 350 N mm
-2
or of a comparable
material;
3) it shall have a lower tip with a maximum radius of 0,5 mm;
4) the angle of the tip shall be between 30° and 60° (see Figure 13);
5) it shall be effective over the full cutting height capacity of the glass bed saw unit. „Effective
operation“ shall be between 85
o
and 55
o
, this angle being measured between a line from the tip to the
axis of pivot of the fingers and the horizontal (see Figure 13);
6) a mechanical stop shall be provided to prevent the anti-kickback finger moving beyond the 85
o
point
(see Figure 13).
Key
e bead ledge separator thickness
B width of cut
b width of saw-blade
Figure 11 — Bead ledge separator thickness in relation to saw-blade dimensions

EN 848-1:2007 (E)
37
Key
1 anti-kickback finger in front of the saw-blade
2 bead ledge separator
3 bead ledge
4 guiding channel for bead ledge
5 workpiece
6 pressure pad
7 feed direction
Figure 12 — Example of anti-kickback finger and guiding channel

EN 848-1:2007 (E)
38
Key
1 anti-kickback finger
2 mechanical end stop
Figure 13 — Example of anti-kickback finger
Verification: By checking the relevant drawings, measurement and inspection of the machine.
5.3.6 Work-piece supports and guides
5.3.6.1 Table
5.3.6.1.1Table dimensions
The table dimensions shall vary in accordance with Table 4 for the table bore diameter (see Figure 14).
The table shall not be tiltable.
Verification: By checking the relevant drawings, measurement and inspection of the machine.

EN 848-1:2007 (E)
39
Key
1 table bore
Figure 14 — Definition of table dimensions
Table 4 — Size of table and table rings
Table bore diameter ≤ 190 > 190
Minimum table length (A min) 600 1 000
B 250 < B ≤ A/2 450 < B ≤ A/2
C
c
± 100
± 200
b
350 350
Ranges of internal diameter
for table rings
65 to 75
a
105 to 115
145 to 160
65 to 75
145 to 160
105 to 115
200 to 225
a For machines fitted with removable spindle.
b For machines with front sliding table.
c Dimension C extends from the spindle axis to the front edge of the fixed table, or, if provided, to the front
edge of an integral sliding table level with the fixed table.
5.3.6.1.2Safeguarding the space between table and tool spindle
5.3.6.1.2.1 Table rings
Where the table is equipped with a set of table rings for bore diameter ≤ 300 mm their internal diameters shall
be as shown in Table 4 (see Figure 15).

EN 848-1:2007 (E)
40
Key
1 table
Figure 15 — Table rings
For table bore diameters greater than 300 mm, a fifth table ring shall be provided.
5.3.6.1.2.2 Table insert
Where the table is equipped with an adjustable table insert (see Figure 16) the following requirements shall be
met:
a) the side of the adjustable table insert closer to the tool shall be of chipable material e.g. light alloy;
b) the side of the adjustable table insert closer to the tool shall be profiled to allow, when completely
retracted, the use of the profiling tool with the greatest diameter + 5 mm for which the machine is designed. In
the advance position the distance between the adjustable table insert and the axis of the spindle shall
be ≤ 50 mm;
c) where adjustment of adjustable table insert and/or fence is automatic, the hazards of shearing or crushing
between the adjustable table insert and the fence shall be prevented e.g. by setting the fence before adjusting
the table insert (see 5.2.8.2 d) and e));
d) hazards of crushing or shearing between table or adjustable table insert and workpiece when feeding the
workpiece shall be minimised in any adjustable table insert position e.g. by setting the table insert before
feeding. The side of the adjustable table insert closer to the operator position shall be lined with soft material
like rubber with hardness between 60 Sh and 70 Sh.

EN 848-1:2007 (E)
41
Key
1 adjustable table insert
2 table insert chipable part
Figure 16 — Example of adjustable table insert
NOTE 1 For power driven adjustment of adjustable table insert under hold-to-run control see 5.2.8.1.
NOTE 2 For automatic power driven adjustment of adjustable table insert see 5.2.8.2.
Verification: By checking the relevant drawings, inspection of the machine, measurement and functional
5.3.6.2 Work-piece guiding for straight work
5.3.6.2.1Fence plate dimensions
In order to ensure vertical stability of the work-piece, the machine shall be equipped with fence plates which:
a) have a minimum height of:
1) 120 mm for table bore diameters less than or equal to 190 mm;
2) 150 mm for table bore diameters greater than 190 mm.
b) have either a minimum length for each plate of:
1) 300 mm for table bore diameters less than or equal to 190 mm;
2) 450 mm for table bore diameters greater than 190 mm, or

EN 848-1:2007 (E)
42
c) have a minimum length for both plates which is at least equal to the table length;
d) satisfy the geometrical requirements given in G4 of ISO 7009:1983.
NOTE Further devices for guiding the work-piece are described in 5.3.7.1.2.1.
Verification: By checking the relevant drawings, inspection of the machine and measurement and performing
test G4 of ISO 7009:1983.
5.3.6.2.2Fence adjustment
The fence assembly shall be capable of being fixed to the table and shall be adjustable in order to take
account of the tool diameter and the position of the spindle.
When adjustments lateral (or transverse) to the feed direction are provided, the fence plates shall remain
integral with their supports.
The lateral adjustment of the fence plates shall allow any opening for the tool to be reduced to a minimum.
The fence plates shall either be fitted with a device to ensure continuity between them, or shall be equipped
with fixing arrangements which permit such a device (e.g. a false fence) to be fitted.
A fine adjustment control for transverse movement of one of the fences with respect to the other shall be
provided.
When moved using this control, the moveable fence plate shall remain parallel to the fixed fence plate and the
method for its re-alignment shall be described (see 6.3).
The part of the fence plate which can come in contact with the tool shall be made of light alloy, plastic, wood
or wood based material.
All adjustments, except those to fix and adjust the device for ensuring continuity between the fence plates,
shall be capable of being made without the aid of a tool.
Where power driven adjustment of the fence under hold-to-run control is provided the requirements of 5.2.8.1
shall be met.
Where automatic power driven adjustment of the fence is provided the requirements of 5.2.8.2 shall be met.
The adjustment device shall be self locking.
Verification: By checking the relevant drawings and/or circuit diagrams, measurement, inspection of the
machine and functional testing of the machine.
5.3.6.2.3Work-piece guiding for curved work
A work-piece guiding device suitable for curved work shall be provided (see Figure 17). This shall be either:
a) guiding steady (ring guide):
1) the shape or adjustment of which shall allow for progressive penetration of the tool into the work-
piece;
2) that shall support and guide the work-piece during machining;
3) that shall have the tangential point where the depth of cut is measured clearly marked;
4) that shall be rigid such that the test shown in Annex B is passed;

EN 848-1:2007 (E)
43
5) the adjustment range of which shall take account of all possible positions of the tool with respect
to the table;
6) that after adjustment shall remain parallel to the table within 0,5 mm over a length of 100 mm, or
b) a lead-in device which allows the use of a ball ring guide which:
1) allows progressive feed of the work-piece to the tool;
2) where the machine has two directions of spindle rotation, shall be designed to allow for its use
whichever direction of rotation is selected;
3) where the guard supporting device is designed to allow for the fixing of a guiding steady, and the
lead-in device is also capable of being fixed to the supporting device, then the lead-in device shall be
capable of being moved out of position whilst remaining integral with the work-piece guiding device to
allow for the use of the guiding steady.
Verification: By checking the relevant drawings, measurements, inspection of the machine, performing the test
described in Annex B and functional testing of the machine.
Key
1 guiding steady (ring guide)
2 lead-in device
3 ball ring guide
4 hand protector
Figure 17 — Examples of curved work guiding devices

EN 848-1:2007 (E)
44
5.3.7 Prevention of access to moving parts
5.3.7.1 Guarding of tools on hand fed machines
5.3.7.1.1Safeguarding under the table
Access to the tool from below the table shall be prevented by a fixed guard or moveable guard interlocked
with the tool spindle drive motor (also see 5.3.7.3). Where the tool spindle run down time exceeds 10 s, the
moveable guard shall be interlocked with guard locking.
The safety related part of the control system for interlocking and/or interlocking with guard locking shall
conform to category 1 in accordance with the requirements of EN ISO 13849-1:2006.
Verification: By checking the relevant drawing and circuit diagrams, inspection of the machine and functional
5.3.7.1.2Safeguarding for straight work
5.3.7.1.2.1 Safeguarding the cutting area
The requirements of 5.3.6.2.2 shall be taken into account and in addition:
Fence and table pressure devices (pressure pads) shall be provided to keep the work-piece in contact with the
table and the fence plates (see Figure 18) and to prevent access to the tool (including shank mounted tool if
fitted).
Key
1 fence pressure pad
2 table pressure pad
Figure 18 — Example of pressure devices

EN 848-1:2007 (E)
45
The pressure pads shall fulfil the following requirements:
a) the table pressure pad shall be adjustable in height relative to the table and horizontally towards and
away from the fence. All adjustments shall be capable of being carried out without the aid of a tool;
b) the fence and table pressure pads shall, over the whole adjustment range, be symmetrically arranged
with respect to the spindle. The work-piece guiding surface of the fence pressure pad shall be parallel with the
fence plates and the work-piece guiding surface of the table pressure pad shall be parallel with the table within
a tolerance of 10 mm over any 100 mm length;
c) the table pressure pad support shall be provided with a device which prevents the pressure pad and/or its
support falling by gravity onto the tool during adjustment;
d) the pressure pads shall be spring loaded to allow for limited variation in work-piece thickness;
e) the length of the table pressure pad shoe shall be greater than the maximum opening between the fence
plates and shall allow the work-piece to contact the pressure pad before it contacts the tool;
f) the fence pressure pad shall have a height at least equal to the minimum height required for the fence
plates in accordance with 5.3.6;
g) the pressure pad support system shall be so designed that it is possible to move the pressure pads from
their working position to a position which will allow for tool changing or the use of a de-mountable power feed
unit, without removing them from the machine. The support system, pressure pads and supports shall be
mechanically locked in place when in the non working position;
h) the pressure pad support system shall be rigid;
i) the support system for the pressure pads shall not be fixed to the table between the fence plate and the
front edge of the table;
j) the pressure pad shoes shall be able to press a work-piece with a minimum section of 8 mm by 8 mm in
the vertical and horizontal directions over the whole length given in 5.3.7.1.2.1 e);
k) the material from which the table pressure pad shoes are made shall be wood, light alloy or plastic. The
fence pressure pad shoe shall be made of wood, wood based material, light alloy or plastic. The fixing
components (e.g. screws) for the fence pressure pad shoe shall be made from a material which is easily
machined (e.g. brass);
l) the vertical adjustment range of the fence pressure pad shall be such that:
1) when adjusted to its lowest position the underside of the pressure pad shoe shall be on the table
surface;
2) when adjusted to its highest position the top surface of the pressure pad shoe shall be at least at the
same height as the top of the useable length of the spindle when the spindle is adjusted to its highest
position;
m) the horizontal adjustment range of the fence pressure pad shall cover a distance of at least 160 mm from
the spindle axis;
n) the design of the pressure pad shoes shall be such that a difference of at least 10 mm is maintained
between the contact point with the work-piece and either the table or the fence pressure pad shoes;
o) where the fence pressure pad can be set at an angle to the fence plate in order to allow for work-piece
feed during stopped work, this angle shall not be greater than 30°. Means shall be provided to reset and
fix the fence pressure pad in position parallel to the fence plate;

EN 848-1:2007 (E)
46
p) the vertical adjustment of the table pressure pad shall be such that it is possible to machine work-pieces
of a height of at least:
1) 160 mm on machines with a table bore diameter up to 190 mm;
2) 250 mm on machines with a table bore diameter greater than 190 mm.
For machines fitted with a glass bead saw unit see 5.3.7.1.5.
Verification: By checking the relevant drawings, measurement, inspection of the machine, performing the
rigidity test of Annex B and functional testing of the machine.
5.3.7.1.2.2 Safeguarding the non-cutting area
Access to the tool (including shank mounted tool if fitted) at the rear of the fence plates shall be prevented by
means of a fixed guard attached to the fence support. The guard shall accommodate the largest diameter tool
for which the machine was designed in accordance with Table 3 at all possible spindle heights. It shall not be
possible to mount a larger tool in the guard. (Also see 5.3.3.3.)
The guard shall allow for tool changing (e.g. by means of a non-interlocked hinged cover which is capable of
being locked in the closed position during normal operation).
It shall not be possible to reach the tool through any gap between the guard and the fence plates.
machine.
5.3.7.1.3Safeguarding for curved work
Access to the tool shall be prevented by an adjustable guard (see Figure 16) which can be fixed in position
relative to the table and fulfils the following requirements (see also 5.3.7.1.6):
a) it shall be possible of adjustment without the aid of a tool;
b) it shall encompass the largest tool for which the steady or ball ring guide is designed;
c) the adjustment range shall include all possible tool positions in respect to the table;
d) it shall be fitted with the supporting system for the work-piece guiding device required in 5.3.6.2.3;
e) it shall be fitted with an adjustable hand protector to prevent access to the non cutting part of the tool from
the front;
f) it shall support the chip exhaust outlet (also see 5.4.3.1);
g) it shall be rigid.
The hand protector shall be in accordance with the following requirements:
1) it shall be adjustable in height from the table surface up to the lower edge of the front part of the
adjustable guard when the largest shank mounted tool and/or the largest tool according to Table 3 for
which the machine is designed is mounted;
2) after adjustment it shall remain parallel to the table within 0,5 mm over a length of 100 mm;
3) the adjustment shall be possible without the aid of a tool.

EN 848-1:2007 (E)
47
The hand protector may also allow for pressure on the work-piece during machining.
Verification: By checking the relevant drawings, measurements, inspection of the machine, performing the
rigidity test in Annex B and functional testing of the machine.
5.3.7.1.4Safeguarding for tenoning
5.3.7.1.4.1 General
If the machine is fitted with tenoning or front travelling table(s) it shall be equipped with a device to maintain
the travelling table(s) in position.
Verification: By checking the relevant drawings and inspection of the machine.
5.3.7.1.4.2 Safeguarding the cutting area
Access to the tool, at least from the front side shall be prevented by adjustable guards mounted on the
travelling table which prevent access to the tool from the side of the work-piece (see Figure 6 c), key 19) and
by an adjustable guard (see Figure 6 c), key 16) or a self adjusting guard (see Figure 6 d)) both mounted on
the fixed guard described in 5.3.7.1.4.3. Guards mounted on the guard described in 5.3.7.1.4.3 shall be
transparent (e.g. made of polycarbonate (PC)) and it shall be possible to observe the process through it while
machining.
The guards shall fulfil the requirements of 5.3.7.3 c).
machine.
5.3.7.1.4.3 Safeguarding the non-cutting area
Access to the tool from above shall be prevented by a fixed guard mounted on the fixed table (see key 9 in
Figure 6 c)). This guard shall be in accordance with the following requirements:
a) it shall be horizontally adjustable at right angles to the direction of feed;
b) it shall encompass the largest tool according to Table 3 for which the machine is designed at all possible
spindle heights;
c) it shall not be possible to mount a larger tool in the guard;
d) it shall be fitted with adjustable sections which prevent access to the tool from above and side(s) of the
work-piece (see Figure 6 c) key 16);
e) tool changing shall be possible without removing it;
f) all adjustments shall be possible without the aid of a tool.
machine.
5.3.7.1.5Safeguarding the glass bead saw blade
On machines fitted with a glass bead saw unit, access to the saw blade shall be prevented by a fixed guard
with the exception of the maximum cutting area of the saw blade. This requirement can be met e.g. by the use
of the extraction hood designed such that the safety distances of EN 294:1992 are met.

EN 848-1:2007 (E)
48
In addition a self adjusting guard shall prevent at least, when in lowest position, the direct horizontal access in
a direction perpendicular to the saw blade plane.
5.3.7.1.6Safe guarding when using shank mounted tools
Access to shank mounted tools shall be prevented either by guards for straight work or curved work.
When using shank mounted tools during straight work the requirements of 5.3.6.2.2 and 5.3.7.1.2 shall be
fulfilled and in addition:
a) the fence plates shall be adjustable in the direction perpendicular to feed direction in order to be
positioned at the rear of the tool axis (viewed from the operator's position) when spindle is in vertical position;
b) the hinged cover of the guard required in 5.3.7.1.2.2, attached to the fence support, shall be adjustable
independently from the fence plates in order to cover the shank mounted tool axis when spindle is in vertical
position and fence plates in any position.
When using shank mounted tools during curved work, the requirements of 5.3.7.1.3 shall be fulfilled.
5.3.7.2 Guarding of drives
Access to the drive mechanism (to tool spindles, feed etc.) shall be prevented by either a fixed guard or a
movable guard interlocked with the spindle drive motor in accordance with Annex N of EN 1088:1995. These
guards shall be designed such that safety distances in EN 294:1992 are met.
Where the rundown time exceeds 10 s and it is possible to gain access to the tool with the guard open, the
guard shall be fitted with guard locking in accordance with 5.3.7.1.1.
On machines where speed change is achieved by changing the position of the drive belts on the drive pulleys
that part of the guarding system which has to be opened for changing the drive belts position shall be
interlocked with the spindle drive motor.
The safety related part of the control system (also see 5.2.1) for interlocking and/or interlocking with guard
locking function shall be in accordance with the requirements of EN ISO 13849-1:2006 and at least:
a) category 1 if the control circuits are hardwired;
b) category 3 if the control circuits include electronic components.
5.3.7.3 Characteristics of guards
The tool guard(s) shall be manufactured from one of the following materials:
a) steel with 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 an ultimate tensile strength of at least 185 N mm
-2
and a wall thickness of at least 3 mm;

BS EN 848-1 Safety Standards

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BS EN 848-1 Safety Standards