www bzfxw com BRITISH STANDARD BS EN 12415 2001 Incorporating Amendment No 1 Safety of machine tools — Small numerically controlled turning machines and turning centres The European Standard EN 12415[.]
Trang 1BRITISH STANDARD BS EN
12415:2001
Incorporating Amendment No 1
The European Standard EN 12415:2001, with the incorporation of
amendment A1:2002 has the status of a British Standard
ICS 25.080.10
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Trang 2BS EN 12415:2001
This British Standard, having
been prepared under the
Engineering Sector Committee
was published under the
authority of the Standards
Committee and comes in to
effect on 15 January 2001
© BSI 12 November 2003
ISBN 0 580 36279 5
National foreword
This British Standard is the official English language version of
EN 12415:2000, including amendment A1:2002
The start and finish of the text introduced or altered by amendments is indicated in the text by tags !" Tags indicating changes to CEN text carry the number of the CEN amendment, for example text altered by CEN
amendment A1 is indicated by !"
The UK participation in its preparation was entrusted by Technical Committee MTE/1, machine tools, to Subcommittee MTE/1/-/9, Safety of metal cutting machine tools, which has the responsibility to:
A list of organizations represented on this subcommittee 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 international/European committee any enquiries on the interpretation, or proposals for change, and keep the
Amendments issued since publication
Trang 3machines and turning centres (includes amendment A1:2002)
Sécurité des machines-outils - Tours à commande
numérique et centres de tournage de petites dimensions
(inclut l’amendement A1:2002)
Sicherheit von Werkzeugmaschinen - Kleine numerisch gesteuerte Drehmaschinen und Drehzentren (enthält Änderung A1:2002)
This European Standard was approved by CEN on 6 July 2000 Amendment A1 was approved by CEN on 18 October 2002
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member
This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom
EUROPEAN COMMITTEE FOR STANDARDIZATION
C O M I T É E U R O P É E N D E N O R M A L I S A T I O N
E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2000 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members
Ref No EN 12415:2000 + A1:2002 E
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EN 12415:2000
Contents Page
Foreword 3
0 Introduction 4
1 Scope 4
2 Normative references 5
3 Terms and definitions 6
4 List of significant hazards 8
5 Safety requirements and/or measures 14
6 Information for use 26
Annex A (informative) Example of check list for safety functions 30
Annex B (normative) Guards on turning machines – Impact test method 32
Annex C (informative) Test equipment for impact test and examples of materials 36
Annex D (normative) Noise emission measurement 38
Annex E (informative) Calculation of direct impact energy 39
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU directives 39
Bibliography 40
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Page 3
EN 12415:2000
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 143 "Machine tools – Safety", the
secretariat of which is held by SNV
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 May 2001, and conflicting national standards shall be withdrawn at the latest by May 2001
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
Organisations contributing to the preparation of this European standard include the European Manufacturer Association CECIMO
Normative and informative annexes to this standard are listed in the content list
The European Standards produced by CEN/TC 143 are particular to machine-tools 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)
The annexes A and C are informative ; the annexes B and D are normative
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
Foreword to amendment 1
This document (EN 12415:2000/A1:2002) has been prepared by Technical CEN /TC 143 "Machine tools - Safety", the secretariat of which is held by SNV
This Amendment to the European Standard EN 12415:2000 shall be given the status of a national standard, either
by publication of an identical text or by endorsement, at the latest by May 2003, and conflicting national standards shall be withdrawn at the latest by May 2003
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 EU Directive(s)
Annex E is informative
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, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom
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EN 12415:2000
0 Introduction
This European Standard has been prepared to be a Harmonised Standard to provide one means of conforming to
the Essential Safety Requirements of the Machinery Directive and associated EFTA regulations
This European Standard is a type C standard as defined in EN 292:1991
The extent to which hazards are covered is indicated in the scope of this standard In addition small numerically
controlled turning machines and turning centres shall comply as appropriate with EN 292:1991 part 1 and 2 for
hazards which are not covered by this standard
The requirements of this European Standard concern designers, manufacturers, suppliers and importers of
machines described in the scope
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
general purpose numerically controlled turning machines and turning centres which are designed primarily to work
cold metal with no access to the work-zone during machining as defined in 3.1 and 3.2 and hereafter referred to as
"machines"
This standard covers the significant hazards, listed in clause 4
This standard applies to :
numerically controlled horizontal spindle turning machines and turning centres with distance between centres
(BC) up to 2 000 mm which are designed to be equipped with workpiece clamping devices up to 500 mm
outside diameter;
numerically controlled vertical turning machines, inverted spindle turning machines including pick up machines
and turning centres which are designed to be equipped with workpiece clamping device up to 500 mm outside
diameter
Larger machines may comply with this standard or shall comply with EN 12478:2000
The standard also applies to ancillary devices, e.g tools, chucks, workpiece handling devices and swarf handling
equipment which are integral to the machine
Where additional processes are involved, this standard can be taken as a basis (see also bibliography annex )
This standard also applies to machines which are integrated into an automatic production line or turning cell where
the hazards and risks arising are comparable to those of machines working separately
This European Standard apply for automatic single spindle turning machines but does not apply to automatic
multispindle turning machines which are dealt with in prEN 13788:1999
This European Standard does not apply to NC turning machines with machining facilities under manual control
which are dealt with in EN 12840:2000
This standard applies to machines which are manufactured after the date of issue of this standard
Trang 7EN 292-1:1991, Safety of machinery – Basic concepts, general principles for design – Part 1 : Basic terminology, methodology
EN 292-2:1991, Safety of machinery – Basic concepts, general principles for design – Part 2 : Technical principles
and specifications
EN 292-2/A1:1995, Safety of machinery – Basic concepts, general principles for design – Part 2 : Technical principles and specifications
EN 294:1992, Safety of machinery – Safety distances to prevent danger zone being reached by the upper limbs
EN 349:1993, Safety of machinery – Dimensions gaps to avoid crushing of parts of the human body
EN 418:1992, Safety of machinery – Emergency stop equipment – Functional aspects – Principles for design
EN 547-1:1996, Safety of machinery – Human body measurements – Part 1 : Principles for determining the dimensions for openings for whole body access into machinery
EN 547-2:1996, Safety of machinery – Human body measurements – Part 2 : Principles for determining the dimensions required for access openings
EN 574:1996, Safety of machinery – Two hand control devices – Functional aspects – Principle for design
EN 614-1:1995, Safety of machinery – Ergonomic design principles – Part 1 : Terminology and general principles
EN 894-1:1997, Safety of machinery – Ergonomic requirements for the design of displays and control actuators – Part 1: Human interaction with display and control actuators
EN 894-2:1997, Safety of machinery – Ergonomic requirements for the design of displays and control actuators – Part 2 : Displays
EN 894-3:2000, Safety of machiery – Ergonomic requirements for the design of displays and control actuators – Part 3 : Control actuators
EN 953:1997, Safety of machinery – Guards – General requirements for the design and construction of fixed and moveable guards
EN 954-1:1996, Safety of machinery – Safety related parts of control systems – Part 1 : General principles for design
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
prEN 1005-1:1998, Safety of machinery – Human physical performances – Part 1 : Terms and definitions
prEN 1005-2:1998, Safety of machinery – Human physical performances – Part 2 : Manual handling of machining and components parts of machinery
prEN 1005-3:1998, Safety of machinery – Human physical performances – Part 3 : Recommended forces limite for
machinery operation
prEN 1005-4:1998, Safety of machinery – Human physical performances – Part 4 : Evaluation of working postures
in relation to machinery
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EN 12415:2000
EN 1037:1995, Safety of machinery – Prevention of unexpected start up
EN 1050:1996, Safety of machinery – Principles for risk assessment
EN 1070:1998, Safety of machinery – Terminology
EN 1088,1995, Safety of machinery – Interlocking devices associated with guards – Principles for design and
selection
EN 1550:1997, Safety requirements for the design and construction of work holding chucks
EN 1760-1:1997, Safety of machinery – Pressure sensitive protective devices – Part 1 : General principles for the
design and testing of pressure sensitive mats and pressure sensitive floors
prEN 1760-2:1996, Safety of machinery – Pressure sensitive protective devices – Part 2 : General principles for the
design and testing of pressure sensitive edges and pressure sensitive bars
EN 1837:1999, Safety of machinery – Integral lighting of machines
EN 12478:2000, Machine tools – Safety – Large numerically controlled turning machines and turning centres
EN 12840:2000, Machine tools – Safety – Manually controlled turning machines
ENV 26385, Ergonomic principles of the design of work systems
EN 60204-1,1992, Safety of machinery – Electrical equipment of machines – Part 1 : Specification for general
requirements
EN 60529:1991, Degrees of protection provided by enclosures (IP code)
EN 60825-1:1994 + A11:1996, Safety of laser products – Part 1 : Equipment classification, requirements and user's
guide (IEC 60825-1:1993)
EN ISO 3744:1995, Acoustics – Determination of sound power level of noise sources using sound pressure –
Engineering method in an essentially free field over a reflecting plane
EN ISO 3746:1995, Acoustics – Determination of sound power level of noise sources using sound pressure –
Survey method using an enveloping measurement surface over a reflecting plane
EN ISO 9614-1:1995, Acoustics – Determination of sound power level of noise sources using sound intensity –
Part 1 : Measurement at discrete points
EN ISO 11202:1995, Acoustics – Noise emitted by machinery and equipment – Measurement method of emission
sound pressure levels at the workstation and at other specified positions – Survey method in situ
EN ISO 11204:1995, Acoustics – Noise emitted by machinery and equipment – Method requiring environmental
corrections
EN ISO 11688-1:1998, Acoustics – Recommended practice for the design of low noise machinery and equipment –
Part 1 : Planning
3 Terms and definitions
For the purposes of this standard and in addition to the terms and definitions given in EN 292:1991, EN 418:1992
and EN 1070:1998 the following terms and definitions apply :
3.1
numerically controlled turning machine
A machine tool in which the principal movement is the rotation of the workpiece against the stationary cutting tool(s)
and where cutting energy is brought by the workpiece and not by the tool This machine is controlled by a numerical
control (NC) providing automatic function according to 3.3.1 and can be of single spindle or multispindle type
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EN 12415:2000
Figure 1 a) — Horizontal NC turning machine
Figure 1 b) — Vertical NC turning machine Figure 1 — Examples of horizontal and vertical turning machines
machine modes of operation
NOTE Definitions of modes of NC are given below :
mode of NC
A mode of operation of the NC or data entry device where entries are interpreted as functions to be executed
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EN 12415:2000
a) manual mode of NC
Non automatic mode of NC of a machine in which the operator controls it without the use of pre-programmed
numeric data for example by push button or joystick control
b) manual data input mode
The entry of programme data by hand at the NC
c) single block mode
The mode of NC in which, at the initiation of the operator only one block of control data is executed
d) automatic mode
The mode of NC in which the machine operates in accordance with the programme data until stopped by the
program or the operator
machine setting mode
Mode in which the operator performs adjustments for the subsequent machining process
The programming, testing and manual (under power) non sequential operation of the machine
NOTE This mode comprises e g program sequence check, measurement of tool and/or workpiece position (e g by
touching the workpiece with a measurement probe or with the tool)
4 List of significant hazards
The significant hazards associated with the machine have been identified (see table 1) in accordance with the
procedures described in 5 of EN 292-1:1991 and EN 1050:1996
The safety requirements and/or measures to eliminate these hazards or reduce their associated risks are laid down
in clause 5 of this standard
NOTE For machines which present additional hazards or do not conform to this standard guidance on risk assessment
can be found in EN 1050:1996 and on measures to be taken for hazards elimination and risk reduction may be found in EN
292-1 and EN 292-2:1991
The designers attention is focused on hazards which can occur during the life of the machine to both operator and
other persons who have access to the danger zone(s) for conditions of intended use including reasonably
foreseeable misuse of the machine (see 3.12 in EN 292-1:1991) The hazards for both machining operation and/or
operations requiring intervention by the operator and/or other personnel (e.g setting, cleaning maintenance and
repair) have to be considered An analysis of failure of machine components including failure in the control
system(s) is part of the risk assessment guidance on this subject is given in EN 954-1:1996
The significant hazards covered by this standard are listed in table 1 Particular attention is given to hazards dealing
with :
ejection of tools, chucksjaws, workpieces or parts of them including swarf and chips (see 17 in table 1) ;
entanglement on or drawing into moving parts of the machine, particularly chucks, tools, and the workpiece
(see 1.4 and 1.5 in table 1) ;
cutting and crushing between moving and fixed/moving parts of the machine (see 1.1 and 1.3 in table 1) ;
Trang 11Page 9
EN 12415:2000 Main danger zones are :
working areas with moving spindle(s), workpiece holding devices (e.g chuck(s)), slide(s), turret(s), workpiece(s), swarf handling equipment (if integrated) ;
workpiece loading/unloading devices including bar feeders for horizontal spindle machines ;
external tool magazines and tool changers
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EN 12415:2000
5 Safety requirements and/or measures
Small numerically controlled turning machines and turning centres shall comply with the safety requirements and/or measures of this clause In addition, the machine shall be designed according to the principles in 5 and 6 of
EN 292:1991 for hazards relevant but not significant which are not dealt with by this standard
For guidance in connection with risk reduction by design, see 3 of EN 292-2:1991, and for safeguarding measures, see 4 of EN 292-2:1991
5.1 Control systems general
In addition to the requirements in 5.1.1 to 5.1.10, below see 3, 3.7 and 3.10 of EN 292-2:1991
5.1.1 Safety and reliability of control systems
For the purpose of this standard safety related part of a control system means the entire system from the initial actuator (control device) or position detector to the point of input to the final actuator or element, e.g motor The safety related parts of control system deal with the following functions and shall fulfil the requirements of the categories given below according to EN 954-1:1996 :
starting and restart category 1 (see 5.1.3) ;
operational stop category 1 (see 5.1.4) ;
selected maximum spindle speed category 2 or 3 (see 5.1.8) ;
emergency stop category 1 or 3 (see 5.1.5) ;
mode selection category 1 (see 5.1.7) ;
interlocking category 1 or 3 (see 5.2.3) ;
interlocking with guard locking category 3 (see 5.2.4.2) ;
axis movement (including reduced speed feeding) : category 2 (see 5.1.8) ;
hold-to-run category 3 (see 5.1.7.2) ;
workpiece clamping category 1 (see 5.2.1)
Any combination of safety related parts of the control system to different categories according to
EN 954-1:1996 which achieve at least the same level of fault resistance is acceptable according to 6.3 in
EN 954-1:1996
Verification : By checking the relevant drawings and/or circuit diagrams and inspection on the machine For components by requiring confirmation of conformity with the relevant standards from the manufacturer
5.1.2 Position of control devices
Control devices shall be located in accordance to EN 894-1:1997, EN 894-2:1997 and EN 894-3:2000 and conform
to 10 of EN 60204-1:1992 (see also 5.1.5)
Verification : By checking the relevant drawings and inspection of the machines
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EN 12415:2000
5.1.3 Starting
For the purpose of this standard the condition in 9.2.5.2 of EN 60204-1:1992 "Safeguards in place and functional"
is achieved by the interlocking arrangements required in 5.1.7.1 and 5.1.7.2
Start and restart function shall conform to category 1 of EN 954-1:1996
Starting various machine functions depends upon the machine mode of operation selected (see 5.1.7)
The closure of the movable guards shall not result in the restart of moving machine parts except if closure of the guard is powered, the guard being fitted with sensitive edges (see 5.2.4.3)
Unexpected start up of hazardous movements, e.g of work holding spindle, axes, turret, tailstock quill, tool or workpiece clamping devices, shall be prevented according to clause 6 of EN 1037:1995 when the movable guards are open
In machining mode, the machine may only be started or restarted when the guards are closed by actuation of the start device provided for that purpose
Operational stop function shall conform to category 1 of EN 954-1:1996
A fault in the safety related part of control system for the operational stop shall result in a stop category 1 according to 9.2 of EN 60204-1:1992 (see also 5.2.2)
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
Emergency stop function shall be initiated by an emergency stop device(s) which shall conform to 10.7 in
EN 60204-1:1992 An emergency stop control device shall be provided at each operator's position including :
the main control panel ;
any portable control panel (if provided) ;
the workpiece loading and unloading station (if separate from the main operator's position) ;
close to and inside the enclosure or tool magazine (where whole body access is possible), when the tool magazine is separate from the machining area
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EN 12415:2000
Verification : By checking the relevant drawings and/or circuit diagrams inspection and functional testing of the machine
5.1.6 Access to the NC program
Where access is provided to programmable functions for alterations in machining mode, e.g for tool offset correction it shall be lockable to prevent unauthorised access to programmed data or programmable functions This may be achieved by the use of a pass word or a key switch (see also 6.2.9)
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
5.1.7 Mode selection
A lockable mode selection switch shall be provided to select between "Machining Mode" and "Setting Mode" in accordance with A.1.2.5 of EN 292-2:1991/A1:1995 and with 9.2.3 of EN 60204-1:1992 (see figure 2)
Mode selection devices shall ensure that only one mode is active at any one time
The parts of the control system provided for mode selection shall be category 1 according to EN 954-1:1996
In addition, the following safeguarding arrangement specified in 5.1.7.1 and 5.1.7.2 shall be provided for the corresponding mode of operation
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
5.1.7.1 Machining mode of operation
When the machining mode of operation is selected and the movable guards are open, no movement of machine elements shall be possible except :
the opening and closing movement of the workpiece clamping device(s) for the purpose of changing workpiece, and
spindle(s) rotation under hold-to-run control which shall not exceed 50 min-1
Other movements shall be possible only when the movable guards are closed (see 5.2.4.2)
Verification : By checking the relevant drawings and/or circuits diagrams inspection and functional testing of the machine
5.1.7.2 Setting mode of operation
When the setting mode of operation is selected and the moveable guards are open movements of machine elements shall only be possible under the following conditions :
Axes movements shall be limited to a speed not exceeding 2 min-1 (see also 5.1.8) The movement shall be controlled by hold-to-run control (conforming to category 3 of EN 954-1:1996) or be limited to incremental movements of not more than 6 mm ;
The rotation of workholding and/or tool spindle(s) shall not exceed 50 min-1 Movement shall be controlled by a hold-to-run control ;
Rotating/indexing of the turret(s) shall only be possible when both hands of the operator are outside the danger zone e.g by using a two hand control device of type II or type IIIB in accordance with 6.2 of
EN 574:1996 or by a hold to run control together with an enabling device
Operation of the tail stock quill under hold to run control
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EN 12415:2000 Safety devices and measures such as reduced speed rotation under hold-to-run control for tools, spindle(s) and axes and two hand control or hold to run control together with an enabling device for turret(s) shall only operate in setting mode
NOTE 1 For interlocking of drive guards see 5.2.3.6
NOTE 2 For parts of the control systems involving interlocking see 5.1.1
Verification : By checking the relevant drawings and/or circuits diagrams, inspection and functional testing of the machine
Trang 20GUARD OPEN (may be closed)
Machine Principal Operating Modes
NC Modes (see ISO 2806)
- spindle speed < 50 min-1
Axe's movements < 2 m/min-1 or
6 mm increment
TWO HAND CONTROL
HOLD TO RUN CONTROL DEVICE
CYCLE START
or other start signal
LOCKABLE MODE SELECTOR
Spindle speed
< 50 min-1
Hold to runcontrol
A deviation from a restricted or the pre-programmed/selected speed that may cause a hasard shall result in an emergency stop (see also 5.1.5)
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
Trang 21NOTE See also 12 of EN 60204-1:1992, IEC 61508:1998 and the standard in preparation, IEC 61511
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machines
5.1.10 Failure of the power supply
Inadequate pressure or voltage shall be detected and the machine cycle shall be stopped
Interruption or a failure of the power supply shall not result in a loss of workpiece clamping or tool clamping until a complete stop is reached
Restoration of the energy supply shall not result in the machine automatic restarting (see EN 1037:1995) and 3.7.2
of EN 292-2:1991 Systems shall be designed so that a line rupture in any circuit (e.g broken wire, pipe or hose) will not result in the loss of a safety function (see EN 60204-1:1992, EN 982:1996 and EN 983:1996)
Verification : By checking the relevant drawings and/or circuits diagrams
5.2 Protection against mechanical hazards
For description see 4.2 of EN 292-1:1991 and for principles see 4 of EN 292-2:1991
Guards shall conform to EN 953:1997
5.2.1 Workpiece clamping conditions
5.2.1.1 General
a) It shall not be possible to manually initiate an opening or closing of the workpiece clamping device while the spindle is rotating ;
b) Workpiece clamping devices shall be marked with their maxim rotational speed ;
c) For manual loading/unloading means shall be provided to prevent fingers being trapped These means may include for example :
1) adjustable jaw stroke not exceeding 4 mm or a guard fulfilling the safety distances according to
EN 294:1992, or
2) incremental movements not exceeding 4 mm, or
3) closing speed not exceeding 4 mm.s-1, or
4) controls for the workpiece clamping device shall be controlled with hands outside the working zone e.g
by two hand control together with a retractable workpiece support
d) A programme shall not run in machining mode of operation unless the following conditions are fulfilled :
1) Machines shall have facilities for entering/validating by the operator the programmed maximum spindle speed for the particular workpiece and the maximum rotational speed for the workpiece clamping device fitted to the machine Omission from the operator to enter or validate these speeds at each programme change shall prevent the machine running in machining mode (see 6.2.4) The lower of these two entered speeds shall not be exceeded
Trang 22Page 20
EN 12415:2000
2) Means shall be provided to monitor the workpiece clamping device actuating force (e.g by monitoring hydraulic pressure) of power operated workpiece clamping devices (see also 5.2.1.4) In addition the jaw stroke(s) shall be monitored to ensure that there is a sufficient stroke available once the component is clamped If the required actuating force is not reached or the necessary remaining stroke is insufficient starting the work holding spindle drive shall be prevented
3) If the spindle drive is rotating and if the actuating force or the remaining stroke fall below a pre-set value a machine stop category 1 according to EN 60204-1:1992 shall be initiated
4) Automatic workpiece clamping (if provided) shall conform to category 1 according to EN 954-1:1996 Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
5.2.1.2 Power operated workpiece clamping device
Power operated work holding chucks shall conform to EN 1550:1997
An actuating force sufficient for the safe clamping of the workpiece shall be maintained until the spindle has come
to rest (see 5.2.1 of EN 1550:1997) e.g by non return valves on the hydraulic system or self locking workpiece clamping device
Verification : By checking the relevant drawings and/or circuit diagrams inspection and functional testing of the machine
5.2.1.3 Manually operated chuck
Manually operated workholding chuck shall conform to EN 1550:1997
Means shall be provided to prevent the key being left in the chuck and the spindle started
NOTE This can be achieved by providing a self ejecting key (e.g spring loaded)
Verification : By checking the relevant drawings and/or circuit diagrams, inspection and functional testing of the machine
5.2.1.4 Tailstock quill
Powered movement of the tailstock shall only be manually initiated using a hold-to-run control with a maximum speed of 20 mm.s-1 when the working zone guard is open The controls shall be designed and arranged so that the direction of movement of the quill is stopped or reversed on release of the hold to run control, in the forward (closing) direction and stopped on release in the reverse (opening) direction (e.g by foot switches/pedals of two or three position type)
Manual initiation of powered quill movement(s) shall not be possible when the work holding spindle is rotating The clamping limit shall be indicated on the tailstock quill and the end position of the quill shall be durably indicated e.g by a coloured ring or limit switches
Verification : By checking the relevant drawings figure and/or circuit diagrams, inspection and functional testing of the machine