EN ISO 23125:2015

Machine tools - Safety - Turning machines (ISO 23125:2015, Corrected version 2016-03-15)

ISO 23125:2014 specifies the requirements and/or measures to eliminate the hazards or reduce the risks in the following groups of turning machines and turning centres, which are designed primarily to shape metal by cutting.
Group 1: Manually controlled turning machines without numerical control.
Group 2: Manually controlled turning machines with limited numerically controlled capability.
Group 3: Numerically controlled turning machines and turning centres.
Group 4: Single- or multi-spindle automatic turning machines.
It covers the significant hazards and applies to ancillary devices (e.g. for workpieces, tools and work clamping devices, handling devices and chip handling equipment), which are integral to the machine. ISO 23125:2014 also applies to machines which are integrated into an automatic production line or turning cell inasmuch as the hazards and risks arising are comparable to those of machines working separately.

Werkzeugmaschinen - Sicherheit - Drehmaschinen (ISO 23125:2015, korrigierte Fassung 2016-03-15)

Diese Internationale Norm legt Anforderungen und/oder Maßnahmen zur Beseitigung von Gefährdungen oder zur Begrenzung von Risiken für die folgenden Bauarten von Drehmaschinen und Drehzentren, die in 3.1 definiert und vorzugsweise für die Kaltbearbeitung von Metall bestimmt sind, fest.
Bauart 1: Handgesteuerte Drehmaschine ohne numerische Steuerung
Bauart 2: Handgesteuerte Drehmaschinen mit begrenzten numerischen Steuerungsfähigkeiten
Bauart 3: Numerisch gesteuerte Drehmaschinen und Drehzentren
Bauart 4: Einzel- oder Multispindel-Drehautomaten
ANMERKUNG 1 Für eine detaillierte Information über die Maschinenbauarten siehe Definitionen in 3.4 und für obligato-rische und optionale Betriebsarten siehe 3.5.
ANMERKUNG 2 Anforderungen in dieser Internationalen Norm sind im Allgemeinen für alle Drehmaschinenbauarten anwendbar. Wenn Anforderungen nur für (eine) bestimmte Bauart(en) von Drehmaschinen anwendbar sind, werden (wird) diese bestimmte Bauart(en) von Drehmaschinen festgelegt.
ANMERKUNG 3 Gefährdungen, die durch andere Metallbearbeitungsprozesse entstehen (z. B. Schleifen und Laser-bearbeitung) werden durch andere Internationale Normen abgedeckt (siehe 'Literaturhinweise').
Diese Internationale Norm deckt die in Abschnitt 4 aufgeführten signifikanten Gefährdungen ab und gilt auch für Zusatzeinrichtungen (z. B. für Werkstücke, Handhabungseinrichtungen für Werkzeuge und Werkstücke, sowie Späneförderer, usw.) die integrale Bestandteile der Maschine sind.
Diese Internationale Norm gilt auch für Maschinen, die in eine automatische Fertigungslinie oder Drehzelle integriert sind, wenn die auftretenden Gefährdungen und Risiken mit denen von separat arbeitenden Maschinen vergleichbar sind.
Diese Internationale Norm enthält ebenfalls eine Liste der sicherheitsrelevanten Informationen, die der Hersteller dem Betreiber mindestens zur Verfügung stellen muss. Siehe auch ISO 12100:2010, Bild 2, welches das Zusammenspiel der jeweiligen Verantwortlichkeit des Herstellers und des Betreibers hinsichtlich der Betriebssicherheit darstellt.
Die Verantwortung des Betreibers, bestimmte Gefährdungen (z. B. Feuer und Explosion) zu erkennen und die daraus resultierenden Risiken herabzusenken kann ausschlaggebend sein (z. B. bei der Frage, ob die zentrale Abzugsanlage ordnungsgemäß funktioniert).
Wenn Zusatzprozesse (z. B. Fräsen, Schleifen usw.) einbezogen werden, kann diese Internationale Norm als Basis für Sicherheitsanforderungen dienen. Für genauere Informationen siehe 'Literaturhinweise'.
Diese Internationale Norm gilt für Maschinen, die nach dem Ausgabedatum dieser Norm hergestellt wurden.

Machines-outils - Sécurité - Machines de tournage (ISO 23125:2015, Version corrigée 2016-03-15)

L'ISO 23125:2014 spécifie les exigences et/ou les mesures permettant d'éliminer les phénomènes dangereux ou de réduire les risques sur les groupes suivants de machines de tournage et centres de tournage qui sont principalement conçus pour le travail à froid des métaux par coupe.
Groupe 1: Machines de tournage à commande manuelle sans commande numérique.
Groupe 2: Machines de tournage à commande manuelle avec commande numérique limitée.
Groupe 3: Machines de tournage et centres de tournage à commande numérique.
Groupe 4: Machines de tournage automatiques monobroches ou multibroches.
Elle couvre les phénomènes dangereux significatifs énumérés dans l'Article 4 et s'applique aux dispositifs auxiliaires (par exemple pour la manutention des pièces ou des outils, pour les dispositifs de prise de pièce, pour l'évacuation des copeaux, etc.) faisant partie intégrante de la machine. L'ISO 23125:2014 s'applique également aux machines intégrées dans une chaîne de production ou une unité de tournage automatisée, dans la mesure où les phénomènes dangereux et risques associés sont comparables à ceux de machines isolées.

Obdelovalni stroji - Varnost - Stružnice (ISO 23125:2015, popravljena različica 2016-03-15)

Ta mednarodni standard določa zahteve in/ali ukrepe za odpravo nevarnosti ali zmanjšanje tveganj za naslednje skupine stružnic in stružnih centrov, ki se uporabljajo predvsem za oblikovanje kovine z rezanjem.
– Skupina 1: Ročno krmiljene stružnice brez numeričnega krmiljenja.
– Skupina 2: Ročno krmiljene stružnice z omejeno numerično krmiljeno zmogljivostjo.
– Skupina 3: Numerično krmiljene stružnice in stružni centri.
– Skupina 4: Eno- ali večvretenske avtomatske stružnice.
OPOMBA 1 Za podrobne informacije o skupinah stružnic glej opredelitve v točki 3.4 ter obvezne in izbirne načine delovanja v točki 3.3.
OPOMBA 2 Zahteve v tem mednarodnem standardu na splošno veljajo za vse skupine
stružnic. Če zahteve veljajo za le posebne skupine stružnic, so te posebne skupine stružnic opredeljene.
OPOMBA 3 Nevarnosti, ki izhajajo iz drugih postopkov obdelave kovin (npr. obdelava z brušenjem in laserjem), so zajete v drugih mednarodnih standardih (glej bibliografijo).
Ta mednarodni standard zajema večje nevarnosti iz točke 4 in velja za pomožne naprave (npr. obdelovance, orodje in vpenjalne naprave, naprave za upravljanje in opremo za upravljanje čipov), ki so vgrajene v stroj.
Ta mednarodni standard velja tudi za stroje, ki so vgrajeni v avtomatsko proizvodno linijo ali stružilno celico, če so nevarnosti in tveganja primerljivi z nevarnostmi in tveganji pri strojih, ki delujejo ločeno.
Ta mednarodni standard vsebuje tudi minimalni seznam informacij v zvezi z varnostjo, ki jih mora proizvajalec zagotoviti uporabniku. Glej tudi sliko 2 v standardu ISO 12100:2010, na kateri je prikazana interakcija odgovornosti proizvajalca in uporabnika za obratovalno varnost.
Odgovornost uporabnika, da opredeli posebne nevarnosti (npr. požar in eksplozija) in s tem zmanjša povezana tveganja, je lahko ključna (npr. ali osrednji sistem ekstrakcije deluje pravilno).
Kadar se izvajajo dodatni postopki (rezkanje, brušenje itd.), je lahko ta mednarodni standard podlaga za varnostne zahteve; za specifične informacije glej bibliografijo.
Ta mednarodni standard se uporablja za stroje, ki so bili izdelani po datumu objave tega mednarodnega standarda.

General Information

• Status: Published
• Publication Date: 13-Jan-2015
• Withdrawal Date: 30-Jul-2015
• ICS: 25.080.01 - Machine tools in general
• ICS: 25.080.10 - Lathes
• Technical Committee: CEN/TC 143 - Machine tools - Safety
• Drafting Committee: CEN/TC 143 - Machine tools - Safety
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 14-Jan-2015
• Completion Date: 14-Jan-2015
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST EN ISO 23125:2015 - Machine tools - Safety - Turning machines (ISO 23125:2015, Corrected version 2016-03-15)

Relations

• Replaces: EN ISO 23125:2010/A1:2012 - Machine tools - Safety - Turning machines - Amendment 1 (ISO 23125:2010/Amd 1:2012)
• Effective Date: 04-Feb-2015
• Replaces: EN ISO 23125:2010 - Machine tools - Safety - Turning machines (ISO 23125:2010)
• Effective Date: 21-Jan-2015
• Revised: prEN ISO 23125-1 - Machine tools safety - Turning machines - Part 1: Safety requirements (ISO/DIS 23125-1:2025)
• Effective Date: 18-Jan-2023

Overview

EN ISO 23125:2015 - Machine tools - Safety - Turning machines (ISO 23125:2015, corrected 2016-03-15) specifies safety requirements to eliminate hazards or reduce risks for turning machines and turning centres designed primarily to shape metal by cutting. The standard covers four machine groups:

• Group 1: Manually controlled turning machines without NC
• Group 2: Manually controlled turning machines with limited NC capability
• Group 3: Numerically controlled turning machines and turning centres
• Group 4: Single- or multi-spindle automatic turning machines

It also applies to integral ancillary devices (workholding, tooling, handling, chip/fluids equipment) and machines integrated into automatic production lines when hazards are comparable. EN ISO 23125:2015 is the CEN-adopted version of ISO 23125:2015 and supports conformity with relevant EU machinery directives.

Key topics and requirements

The standard addresses significant hazards and sets out safety requirements and/or protective measures, including:

• Hazard identification: Main hazard zones and a comprehensive list of mechanical, electrical, noise, radiation, material and ergonomic hazards.
• Guards and enclosures: Required characteristics for guards across machine groups and impact test methods (Annex A).
• Workpiece clamping & tooling: Safe clamping conditions and tooling instructions.
• Modes of operation: Mandatory and optional machine operation modes and safety implications (manual, NC, automatic).
• Control and safety functions: Protection against unexpected start-up, over-run/over-speed, power or control failures, and variation in rotational speed.
• Ejection and fluids: Requirements for protection from ejected objects and fluids; special guidance for large horizontal/vertical NC machines.
• Verification & performance: Verification of safety measures and examples for determining performance levels for interlocked guards (Annex F).
• Information for use: Marking, instruction content, installation, cleaning, residual risk information.
• Tests and guidance: Annexes include impact test methods, test equipment/materials, energy calculation, checklists for safety functions, exhaust/extinguishing system examples.

Applications and who uses it

EN ISO 23125:2015 is used by:

• Machine manufacturers and designers for safe machine design and CE marking support.
• Safety engineers and compliance officers to verify conformity with machinery safety requirements and EU directives.
• Plant managers and purchasing teams assessing machine safety during procurement and integration into production cells.
• Operators and maintenance personnel for understanding guarding, safe modes of operation, and required instructions.
• Test labs and certification bodies applying the annex test methods and performance-level assessments.

Related standards

EN ISO 23125:2015 is part of the machine tools safety family and is intended to be used alongside relevant electrical, control-system (IEC), and EU machinery-directive standards for full compliance.

Keywords: machine tools safety, turning machines, lathes, ISO 23125, EN ISO 23125:2015, turning centres, guards, risk reduction, CNC safety.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2015
1DGRPHãþD
SIST EN ISO 23125:2010
SIST EN ISO 23125:2010/A1:2012
Obdelovalni stroji - Varnost - Stružnice (ISO 23125:2015)
Machine tools - Safety - Turning machines (ISO 23125:2015)
Werkzeugmaschinen - Sicherheit - Drehmaschinen (ISO 23125:2015)
Machines-outils - Sécurité - Machines de tournage (ISO 23125:2015)
Ta slovenski standard je istoveten z: EN ISO 23125:2015
ICS:
13.110 Varnost strojev Safety of machinery
25.080.10 Stružnice Lathes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 23125
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2015
ICS 25.080.01 Supersedes EN ISO 23125:2010
English Version
Machine tools - Safety - Turning machines (ISO 23125:2015)
Machines-outils - Sécurité - Machines de tournage (ISO Werkzeugmaschinen - Sicherheit - Drehmaschinen (ISO
23125:2015) 23125:2015)
This European Standard was approved by CEN on 25 September 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23125:2015 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC .4
Foreword
This document (EN ISO 23125:2015) has been prepared by Technical Committee ISO/TC 39 “Machine tools”
in collaboration with 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 July 2015, and conflicting national standards shall be withdrawn at the
latest by July 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 23125:2010.
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).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
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, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 23125:2015 has been approved by CEN as EN ISO 23125:2015 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC
This European Standard has been prepared under a mandate given to CEN [CEN/CENELEC/ETSI] by the
European Commission [and] the European Free Trade Association to provide one means of conforming to
Essential Requirements of the New Approach Directive 98/37/EC.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the normative clauses of
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of that Directive and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the products falling within the
scope of this standard.
INTERNATIONAL ISO
STANDARD 23125
Second edition
2015-01-15
Machine tools — Safety — Turning
machines
Machines-outils — Sécurité — Machines de tournage
Reference number
ISO 23125:2015(E)
©
ISO 2015
ISO 23125:2015(E)
© ISO 2015
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 4
3.1 General terms . 4
3.2 Terms related to parts of turning machines . 5
3.3 Terms related to modes of operation — Mandatory and optional modes of
operation for turning machines . 7
3.4 Terms related to sizes and groups of turning machines defined . 8
3.5 Terms related to maximum permissible spindle speeds and axes feeds .13
4 List of significant hazards .14
4.1 General .14
4.2 Main hazard zones .14
4.3 Significant hazards and hazardous situations covered by this International Standard .15
5 Safety requirements and/or protective measures .19
5.1 General requirements .19
5.1.1 Overview .19
5.1.2 Required characteristics for guards for all machine groups .20
5.2 Specific requirements resulting from mechanical hazards identified in Clause 4 .20
5.2.1 Group 1 machines .20
5.2.2 Groups 2, 3 and 4 machines .21
5.2.3 Workpiece clamping conditions .24
5.2.4 Modes of machine operation .25
5.2.5 Optional or additional equipment for turning machines .30
5.3 Specific requirements resulting from electrical hazards .32
5.4 Specific requirements resulting from noise hazards .33
5.5 Specific requirements resulting from radiation hazards .33
5.6 Specific requirements resulting from material or substance hazards .33
5.7 Specific requirements resulting from neglect of ergonomic principles hazards .34
5.8 Specific requirements resulting from unexpected start-up, over-run or over-
speed hazards .35
5.9 Specific requirements resulting from variation in rotational speed of tool hazards .37
5.10 Specific requirements resulting from failure of the power supply hazards .38
5.11 Specific requirements resulting from failure of the control circuit hazards.38
5.12 Specific requirements resulting from errors of fitting hazards .40
5.13 Specific requirements resulting from ejected fluids or objects hazards .40
5.13.1 General requirements .40
5.13.2 Guards for large vertical Group 3 machines (NC turning machines and
turning centres) .41
5.13.3 Guards for large horizontal Group 3 machines (NC turning machines and
turning centres) .41
5.14 Specific requirements resulting from loss of stability hazards .42
5.15 Specific requirements resulting from slips, trips and fall of persons hazards .42
5.16 Verification of the safety requirements and/or protective measures .42
6 Information for use .44
6.1 Marking .45
ISO 23125:2015(E)
6.2 Instruction for use .45
6.2.1 General.45
6.2.2 Tooling .47
6.2.3 Workpiece clamping .47
6.2.4 Machine functions accessible from the NC panel .48
6.2.5 Restart .48
6.2.6 Noise .48
6.2.7 Ancillary handling devices .49
6.2.8 Residual risks to be addressed by the machinery user .49
6.2.9 Installation instructions for the turning machine .50
6.2.10 Cleaning instruction for the machine.50
Annex A (normative) Impact test method for guards on turning machines .51
Annex B (informative) Test equipment for impact test and examples of materials .56
Annex C (informative) Calculation of direct impact energy .59
Annex D (informative) Example of checklist for safety functions .61
Annex E (informative) Examples of exhaust and extinguishing systems .63
Annex F (informative) Example of the determination of performance level for
interlocked guard .67
Bibliography .72
iv © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 39, machine tools, Subcommittee SC 10, Safety.
This second edition cancels and replaces the first edition (ISO 23125:2010), of which it constitutes a
minor revision. It also incorporates the Amendment ISO 23125:2010/Amd1:2012.
The International Standards produced by ISO/TC 39/SC 10 in collaboration with CEN/TC 143 are
particular to machine tools and complement the relevant A and B standards on the subject of general
safety (see Introduction to ISO 12100 for a description of type-A, -B and -C standards).
This International 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).
ISO 23125:2015(E)
Introduction
This International Standard has been prepared to be a Harmonized Standard to provide one means of
conforming to the Essential Safety Requirements of the Machinery Directive of the European Union and
associated EFTA regulations.
This International Standard is a type-C standard as defined in ISO 12100:2010.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered
is indicated in the Scope of this International Standard. In addition, turning machines shall comply as
appropriate with ISO 12100:2010 for hazards which are not covered by this International Standard.
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 the other
International Standards for machines that have been designed and built in accordance with the
provisions of this type-C standard.
This International Standard makes reference to the “safety categories” in EN 954-1:1996 as resistance
to faults and their subsequent behaviour in the fault condition together with the “performance level”
defined in ISO 13849-1:2006 in terms of probability of dangerous failure per hour. It is the decision of
the user of this International Standard to apply “safety categories” or “performance levels”.
The requirements of this International Standard concern designers, manufacturers, suppliers and
importers of machines described in the Scope.
This International Standard also includes a list of informative items to be provided by the manufacturer
to the user.
The requirements for a new mode of operation, Mode 3 “manual intervention machining mode” will be
discussed in the future.
vi © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 23125:2015(E)
Machine tools — Safety — Turning machines
1 Scope
This International Standard specifies the requirements and/or measures to eliminate the hazards or
reduce the risks in the following groups of turning machines and turning centres, which are designed
primarily to shape metal by cutting.
— Group 1: Manually controlled turning machines without numerical control.
— Group 2: Manually controlled turning machines with limited numerically controlled capability.
— Group 3: Numerically controlled turning machines and turning centres.
— Group 4: Single- or multi-spindle automatic turning machines.
NOTE 1 For detailed information on the machine groups, see the definitions in 3.4 and mandatory and optional
modes of operation in 3.3.
NOTE 2 Requirements in this International Standard are, in general, applicable to all groups of turning
machines. If requirements are applicable to some special group(s) of turning machines only, then the special
group(s) of turning machine(s) is/are specified.
NOTE 3 Hazards arising from other metalworking processes (e.g. grinding and laser processing) are covered
by other International Standards (see Bibliography).
This International Standard covers the significant hazards listed in Clause 4 and applies to ancillary
devices (e.g. for workpieces, tools and work clamping devices, handling devices and chip handling
equipment), which are integral to the machine.
This International Standard also applies to machines which are integrated into an automatic production
line or turning cell inasmuch as the hazards and risks arising are comparable to those of machines
working separately.
This International Standard also includes a minimum list of safety-relevant information which the
manufacturer has to provide to the user. See also ISO 12100:2010, Figure 2, which illustrates the
interaction of manufacturer’s and user’s responsibility for the operational safety.
The user’s responsibility to identify specific hazards (e.g. fire and explosion) and reduce the associated
risks can be critical (e.g. whether the central extraction system is working correctly).
Where additional processes (milling, grinding, etc.) are involved, this International Standard can be
taken as a basis for safety requirements; for specific information see the Bibliography.
This International Standard applies to machines that are manufactured after the date of issue of this
International Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable to its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 230-5:2000, Test code for machine tools — Part 5: Determination of the noise emission
ISO 447:1984, Machine tools — Direction of operation of controls
ISO 702 (all parts), Machine tools — Connecting dimensions of spindle noses and work holding chucks
ISO 23125:2015(E)
ISO 841:2001, Industrial automation systems and integration — Numerical control of machines —
Coordinate system and motion nomenclature
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3746:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their
components
ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their
components
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 6385:2004, Ergonomic principles in the design of work systems
ISO 8525:2008, Airborne noise emitted by machine tools — Operating conditions for metal-cutting machines
ISO 9241 (all parts), Ergonomics of human-system interaction
ISO 9355-1, Ergonomic requirements for the design of displays and control actuators — Part 1: Human
interactions with displays and control actuators
ISO 9355-2, Ergonomic requirements for the design of displays and control actuators — Part 2: Displays
ISO 9355-3, Ergonomic requirements for the design of displays and control actuators — Part 3: Control
actuators
ISO 10218-2:2011, Robots and robotic devices — Safety requirements for industrial robots — Part 2: Robot
systems and integration
ISO 11161:2007+Amd.1:2010, Safety of machinery — Integrated manufacturing systems — Basic
requirements
ISO 11202:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate environmental
corrections
ISO 11204:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying accurate environmental
corrections
ISO 11228 (all parts), Ergonomics — Manual handling
ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2:2003, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13850:2006, Safety of machinery — Emergency stop — Principles for design
ISO 13851:2002, Safety of machinery — Two-hand control devices — Functional aspects and design
principles
2 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
ISO 13854:1996, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of
parts of the human body
ISO 13856-2:2005, Safety of machinery — Pressure-sensitive protective devices — Part 2: General principles
for the design and testing of pressure-sensitive edges and pressure-sensitive bars
ISO 13856-3:2013, Safety of machinery — Pressure-sensitive protective devices — Part 3: General principles
for design and testing of pressure-sensitive bumpers, plates, wires and similar devices
ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
ISO 14118:2000, Safety of machinery — Prevention of unexpected start-up
ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for design
and selection
ISO 14120:2002, Safety of machinery — Guards — General requirements for the design and construction of
fixed and movable guards
ISO 14122-1:2001, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of
fixed means of access between two levels
ISO 14122-2:2001, Safety of machinery — Permanent means of access to machinery — Part 2: Working
platforms and walkways
ISO 14122-3:2001, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails
ISO 14122-4:2004, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders
ISO 14159:2002, Safety of machinery — Hygiene requirements for the design of machinery
ISO 15534-1:2000, Ergonomic design for the safety of machinery — Part 1: Principles for determining the
dimensions required for openings for whole-body access into machinery
ISO 15534-2:2000, Ergonomic design for the safety of machinery — Part 2: Principles for determining the
dimensions required for access openings
ISO 16156:2004, Machine-tools safety — Safety requirements for the design and construction of work
holding chucks
IEC 60204-1:2009, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60825-1:2007, Safety of laser products — Part 1: Equipment classification and requirements
IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for
industrial environments
IEC 61000-6-4:2011, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission
standard for industrial environments
IEC 61800-5-2:2007, Adjustable speed electrical power drive systems — Part 5-2: Safety requirements —
Functional
EN 954-1:1996, Safety of machinery — Safety-related parts of control systems — Part 1: General principles
for design
EN 1837:1999+A1:2009, Safety of machinery — Integral lighting of machines
ISO 23125:2015(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 13849-1:2006
and EN 954-1:1996 and the following apply.
3.1 General terms
3.1.1
turning machine
machine tool in which the principal movement is the rotation of the workpiece against the stationary
cutting tool(s)
3.1.2
manual control
mode of operation where each movement of the machine is individually initiated and controlled by the
operator
3.1.3
manually controlled turning machine
turning machine (3.1.1) for which process steps for the machining are controlled or started by an operator
without support by an NC-machining program
3.1.4
numerical control
NC
computerized numerical control
CNC
automatic control of a process performed by a device that makes use of numerical data introduced while
the operation is in progress
[SOURCE: ISO 2806:1994, 2.1.1]
3.1.5
numerically controlled turning machine
NC turning machine
turning machine that operates under numerical control (3.1.4) or computerized numerical control (CNC)
3.1.6
turning centre
numerically controlled turning machine (3.1.5) equipped with power-driven tools and the capability to
orientate the work holding spindle around its axis
Note 1 to entry: A turning centre can also include, but is not limited to, functions such as gauging, burnishing,
threading, boring, milling, grinding and drilling.
Note 2 to entry: If grinding processes are involved, see EN 13218 for additional safety measures.
3.1.7
work zone
space where metal cutting is to take place
3.1.8
performance level
PL
discrete level used to specify the ability of safety-related parts of control systems to perform a safety
function under foreseeable conditions
[SOURCE: ISO 13849-1:2006, 3.1.23]
4 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
3.1.9
mean time to dangerous failure
MTTF
d
expectation of the mean time to dangerous failure
[SOURCE: ISO 13849-1:2006, 3.1.25]
3.1.10
category
classification of safety-related parts of a control system in respect of its resistance to fault and its
subsequent behaviour in the fault condition, and which is achieved by the structural arrangement of the
parts and/or their reliability
[SOURCE: EN 954-1:1996, 3.2.]
3.2 Terms related to parts of turning machines
3.2.1
vision panel
window provided in a guard through which the operator can view the work zone (3.1.7) or other areas
of the machine
3.2.2
chuck
clamping device in which workpieces are clamped with the aid of either manual energy or pneumatic,
hydraulic or electric energy
Note 1 to entry: See Figure 1.
NOTE The chuck with 3 jaws is an example only, a chuck can have 2, 3, 4 or 6 jaws.
Figure 1 — Chuck
3.2.3
collet
device designed to hold the bar into the turning spindle, e.g. by pressure bar or draw bar
Note 1 to entry: See Figure 2.
ISO 23125:2015(E)
Figure 2 — Collet
3.2.4
electronic handwheel
manually operated control device which initiates and maintains an axis movement by pulse generation
input to the numerical control (3.1.4) during its rotation
6 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
3.3 Terms related to modes of operation — Mandatory and optional modes of
operation for turning machines
NOTE Table 1 gives an overview of the mandatory, optional or not allowed modes of operations for turning
machines. Table 1 is mandatory.
Table 1 — Overview of turning machine groups and modes of operation
Turning machines
Group 1 Group 2 Group 3 Group 4
Manually controlled Manually controlled Numerically con- Single- or multi-spin-
Mode
turning machines turning machines trolled turning dle automatic turning
of operation
without numerical with limited capa- machines and turn- machines
control bility of numerical ing centres
control
Mode 0
Mandatory Mandatory Optional Not allowed
manual mode
Mode 1 Mandatory
Not allowed Mandatory Mandatory
automatic mode limited Mode 1
a
Mode 2
Not allowed Optional Mandatory Mandatory
setting mode
a
Service mode Not allowed Optional Optional Optional
a
These modes are key protected and only available for well-trained and qualified staff (see 6.2.1). In order to allocate the
access, it may be necessary to provide different key switches (or other appropriate access means) for a turning machine.
For example:
— Key 1: Access to setting mode (and automatic mode) for setting staff;
— Key 2: Access to CNC program code and CNC-parameter modifications to adequately trained staff [see 5.8 b) 2)];
— Key 3: Access to service mode for service staff.
NOTE  In most applications, key switch 1 (setting mode) and key switch 2 (CNC program code access) can be identical.
3.3.1
Mode 0: manual mode
operation of the machine by the operator without NC functions or non-automatic mode of the machine
axes, where the operator has control over the machining process without the use of pre-programmed
operations
3.3.2
Mode 1: automatic mode
automatic, programmed, sequential operation of the machine with the facility for manual or automatic
loading/unloading of workpiece and tools, until stopped by program or operator
3.3.3
Mode 2: setting mode
mode of operation in which adjustments for the subsequent machining process are performed by the
operator
Note 1 to entry: Checking of tool or workpiece position (e.g. by touching the workpiece with a probe or tool) are
procedures of the setting mode (see 5.2.4.4).
3.3.4
service mode
mode for service and maintenance tasks, such as axis calibration by laser, ballbar testing and spindle
error analysis
Note 1 to entry: In service mode, the machining of a workpiece is not allowed (see 5.2.4.5).
ISO 23125:2015(E)
3.4 Terms related to sizes and groups of turning machines defined
NOTE With regard to the relevant hazards, the turning machines are subdivided into four different groups.
Group 1, Group 2 and Group 3 turning machines can then be subdivided into “small” or “large” sizes. See the
overview in Table 2.
Table 2 — Overview of sizes and groups of turning machines
Group Group name Subclause in Subdivision Subclause in
No. which group is in sizes which size is
defined defined
Small 3.4.1
Manually controlled turning machines with-
Group 1 3.4.3
out numerical control
Large 3.4.2
Small 3.4.1
Manually controlled turning machines with
Group 2 3.4.4
limited numerically controlled capability
Large 3.4.2
Small 3.4.1
Numerically controlled turning machines
Group 3 3.4.5
and turning centres
Large 3.4.2
Single- or multi-spindle automatic turning No subdivi-
Group 4 3.4.6 —
machines sion
3.4.1
small turning machine
turning machine within the following dimensional limits:
— horizontal spindle turning machines and turning centres with distance between centres (BC) up to
and including 2 000 mm and which are designed to accept workpiece clamping devices of up to and
including 500 mm outside diameter;
— vertical turning machines, inverted spindle turning machines including pick-up machines and
turning centres, which are designed to accept workpiece clamping devices of up to and including
500 mm outside diameter
3.4.2
large turning machine
turning machine which exceeds the following dimensional limits:
— horizontal spindle turning machines and turning centres with distance between centres exceeding
2 000 mm or which are designed to accept work clamping devices exceeding 500 mm outside
diameter;
— vertical turning machines, inverted spindle turning machines, including pick-up machines, and
turning centres which are designed to accept work clamping devices exceeding 500 mm outside
diameter
3.4.3
Group 1: manually controlled turning machine without numerical control
turning machine, where all movements are initiated and controlled by the operator, one at a time
Note 1 to entry: This group of turning machines may be equipped with the following features:
— mechanical facilities for mechanical feed or thread cutting;
— electronic facilities for constant surface speed (CSS);
— copying attachments (cam, template, etc.);
— but shall have no limited or full numeric control system (NC).
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
8 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Key
1 rear spindle end guard 3 front chip/splash guard (saddle mounted)
2 chuck guard 4 rear chip/splash guard
Figure 3 — Group 1: Example of a manually controlled, horizontal spindle turning machine
3.4.4
Group 2: manually controlled turning machine with limited numerically controlled capability
turning machine that can be operated as a Group 1 machine by the use of electronic handwheels or as a
machine with limited NC control by operating controls on NC panel
Note 1 to entry: This group of turning machines may be equipped with some or all of the features of Group 1
turning machines (manual turning machines without NC) and the following:
— a limited numeric control system (NC) providing:
— constant surface speed (CSS);
— axis interpolation (i.e. copying/predefined profiling);
— thread cutting cycles.
However, the following features shall not be provided:
— automatic program start;
— automatic initiated tool change, turret indexing or tailstock quill advance or retract;
— unlimited rapid axis movements;
— automatic workpiece change or bar feed system.
ISO 23125:2015(E)
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
Key
1 rear spindle guard 3 rear guard
2 front guard 4 chuck guard
NOTE The partial enclosure comprises 2 and 3.
Figure 4 — Group 2: Example of a manually controlled turning machine with limited NC
capability
3.4.5
Group 3: numerically controlled turning machine and turning centre
turning machine with numerical control (NC) providing automatic function
Note 1 to entry: This group of turning machines may be equipped with some or all of the following features:
— a numeric control system (NC);
— automatic workpiece change or bar feed systems;
— automatic tool magazine, tool transfer and tool changing systems;
— automatic turret indexing or tailstock quill advance or retract;
— counter work holding spindle;
— double work holding spindle;
— secondary machining operations (e.g. milling, grinding, drilling);
— ancillary handling devices.
10 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
However, it shall not be equipped with a rotating work holding spindle carrier, which moves the work holding
spindle(s) from station to station.
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
Key
1 vision panel 4 chips conveyor
2 interlocked movable guards 5 work zone
3 enclosing guard 6 main control panel
Figure 5 — Group 3: Example of a small horizontal turning machine
Key
1 rear guard 5 control panel
2 chuck guard 6 platform
ISO 23125:2015(E)
3 access door 7 saddle
4 front guard
Figure 6 — Group 3: Example of a large horizontal NC turning machine
Key
1 perimeter fence
2 platform
Figure 7 — Group 3: Example of a large vertical NC turning machine with operating platform
3.4.6
Group 4: single- or multi-spindle automatic turning machine
horizontal or vertical spindle turning machine, designed for batch production of parts according to an
NC and/or mechanical (e.g. by cam or template) pre-set program with fixed sequence of operation
Note 1 to entry: This group of turning machines may be equipped with some or all of the following features:
— a spindle carrier holding two or more work holding spindles, equipped with either power-operated chucks or
collets;
— additional features e.g. power-driven tools and one or more sub/counter spindles;
— the drives of the work holding spindles, tool spindles and sub/counter spindles may be by common and/or
independent drives.
However, this group shall have no manually operated chucks.
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
12 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Key
1 guarding of bar feeder
2 vision panel
3 interlocked movable guard
4 main control panel
5 enclosing guard
Figure 8 — Group 4: Example of a multi-spindle NC bar automatic turning
machine with second carrier for counterspindles
3.5 Terms related to maximum permissible spindle speeds and axes feeds
3.5.1
maximum spindle speed
maximum permissible rotational speed for a work holding or tool spindle specified and set as a machine
parameter by the machine manufacturer
3.5.2
maximum work holding device speed
maximum permissible rotational speed of the work holding device spec
...

SLOVENSKI STANDARD
01-marec-2015
Nadomešča:
SIST EN ISO 23125:2010
SIST EN ISO 23125:2010/A1:2012
Obdelovalni stroji - Varnost - Stružnice (ISO 23125:2015, popravljena različica 2016
-03-15)
Machine tools - Safety - Turning machines (ISO 23125:2015, Corrected version 2016-03-
15)
Werkzeugmaschinen - Sicherheit - Drehmaschinen (ISO 23125:2015, korrigierte
Fassung 2016-03-15)
Machines-outils - Sécurité - Machines de tournage (ISO 23125:2015, Version corrigée
2016-03-15)
Ta slovenski standard je istoveten z: EN ISO 23125:2015
ICS:
13.110 Varnost strojev Safety of machinery
25.080.10 Stružnice Lathes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23125
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2015
EUROPÄISCHE NORM
ICS 25.080.01 Supersedes EN ISO 23125:2010
English Version
Machine tools - Safety - Turning machines (ISO
23125:2015, Corrected version 2016-03-15)
Machines-outils - Sécurité - Machines de tournage (ISO Werkzeugmaschinen - Sicherheit - Drehmaschinen
23125:2015, Version corrigée 2016-03-15) (ISO 23125:2015, korrigierte Fassung 2016-03-15)
This European Standard was approved by CEN on 25 September 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23125:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 4

European foreword
This document (EN ISO 23125:2015) has been prepared by Technical Committee ISO/TC 39 “Machine
tools” in collaboration with 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 July 2015, and conflicting national standards shall be
withdrawn at the latest by July 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 23125:2010.
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).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 23125:2015, Corrected version 2016-03-15 has been approved by CEN as EN
ISO 23125:2015 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN [CEN/CENELEC/ETSI] by the
European Commission [and] the European Free Trade Association to provide one means of conforming
to Essential Requirements of the New Approach Directive 2006/42/EC.
Once this standard is cited in the Official Journal of the European Union under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of
conformity with the corresponding Essential Requirements of that Directive and associated EFTA
regulations.
WARNING — Other requirements and other EU Directives may be applicable to the products falling
within the scope of this standard.

INTERNATIONAL ISO
STANDARD 23125
Second edition
2015-01-15
Corrected version
2016-03-15
Machine tools — Safety — Turning
machines
Machines-outils — Sécurité — Machines de tournage
Reference number
ISO 23125:2015(E)
©
ISO 2015
ISO 23125:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 4
3.1 General terms . 4
3.2 Terms related to parts of turning machines . 5
3.3 Terms related to modes of operation — Mandatory and optional modes of
operation for turning machines . 7
3.4 Terms related to sizes and groups of turning machines defined . 8
3.5 Terms related to maximum permissible spindle speeds and axes feeds .13
4 List of significant hazards .14
4.1 General .14
4.2 Main hazard zones .15
4.3 Significant hazards and hazardous situations covered by this International Standard .15
5 Safety requirements and/or protective measures .19
5.1 General requirements .19
5.1.1 Overview .19
5.1.2 Required characteristics for guards for all machine groups .19
5.2 Specific requirements resulting from mechanical hazards identified in Clause 4 .20
5.2.1 Group 1 machines .20
5.2.2 Groups 2, 3 and 4 machines .21
5.2.3 Workpiece clamping conditions .24
5.2.4 Modes of machine operation .25
5.2.5 Optional or additional equipment for turning machines .29
5.3 Specific requirements resulting from electrical hazards .32
5.4 Specific requirements resulting from noise hazards .32
5.5 Specific requirements resulting from radiation hazards .32
5.6 Specific requirements resulting from material or substance hazards .33
5.7 Specific requirements resulting from neglect of ergonomic principles hazards .34
5.8 Specific requirements resulting from unexpected start-up, over-run or over-
speed hazards .35
5.9 Specific requirements resulting from variation in rotational speed of tool hazards .37
5.10 Specific requirements resulting from failure of the power supply hazards .37
5.11 Specific requirements resulting from failure of the control circuit hazards.38
5.12 Specific requirements resulting from errors of fitting hazards .39
5.13 Specific requirements resulting from ejected fluids or objects hazards .39
5.13.1 General requirements .39
5.13.2 Guards for large vertical Group 3 machines (NC turning machines and
turning centres) .40
5.13.3 Guards for large horizontal Group 3 machines (NC turning machines and
turning centres) .41
5.14 Specific requirements resulting from loss of stability hazards .41
5.15 Specific requirements resulting from slips, trips and fall of persons hazards .41
5.16 Verification of the safety requirements and/or protective measures .41
6 Information for use .44
6.1 Marking .44
6.2 Instruction for use .44
6.2.1 General.44
6.2.2 Tooling .46
6.2.3 Workpiece clamping .46
6.2.4 Machine functions accessible from the NC panel .47
ISO 23125:2015(E)
6.2.5 Restart .47
6.2.6 Noise .47
6.2.7 Ancillary handling devices .48
6.2.8 Residual risks to be addressed by the machinery user .48
6.2.9 Installation instructions for the turning machine .49
6.2.10 Cleaning instruction for the machine.49
Annex A (normative) Impact test method for guards on turning machines .50
Annex B (informative) Test equipment for impact test and examples of materials .55
Annex C (informative) Calculation of direct impact energy .58
Annex D (informative) Example of checklist for safety functions .60
Annex E (informative) Examples of exhaust and extinguishing systems .62
Annex F (informative) Example of the determination of performance level for
interlocked guard .66
Bibliography .71
iv © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 39, machine tools, Subcommittee SC 10, Safety.
This second edition cancels and replaces the first edition (ISO 23125:2010), of which it constitutes a
minor revision. It also incorporates the Amendment ISO 23125:2010/Amd. 1:2012.
The International Standards produced by ISO/TC 39/SC 10 in collaboration with CEN/TC 143 are
particular to machine tools and complement the relevant A and B standards on the subject of general
safety (see Introduction to ISO 12100 for a description of type-A, -B and -C standards).
This International 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).
This corrected version of ISO 23125:2015 incorporates the following corrections: in 5.3 a) 2), normative
references to IEC 60204-1 have been substituted for those to IEC 60529 in two instances, and the year
of publication of IEC 60529 corrected from 2003 to 2013 in the remaining reference to that standard.
ISO 23125:2015(E)
Introduction
This International Standard has been prepared to be a Harmonized Standard to provide one means of
conforming to the Essential Safety Requirements of the Machinery Directive of the European Union and
associated EFTA regulations.
This International Standard is a type-C standard as defined in ISO 12100:2010.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered
is indicated in the Scope of this International Standard. In addition, turning machines shall comply as
appropriate with ISO 12100:2010 for hazards which are not covered by this International Standard.
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 the other
International Standards for machines that have been designed and built in accordance with the
provisions of this type-C standard.
This International Standard makes reference to the “safety categories” in EN 954-1:1996 as resistance
to faults and their subsequent behaviour in the fault condition together with the “performance level”
defined in ISO 13849-1:2006 in terms of probability of dangerous failure per hour. It is the decision of
the user of this International Standard to apply “safety categories” or “performance levels”.
The requirements of this International Standard concern designers, manufacturers, suppliers and
importers of machines described in the Scope.
This International Standard also includes a list of informative items to be provided by the manufacturer
to the user.
The requirements for a new mode of operation, Mode 3 “manual intervention machining mode” will be
discussed in the future.
vi © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 23125:2015(E)
Machine tools — Safety — Turning machines
1 Scope
This International Standard specifies the requirements and/or measures to eliminate the hazards or
reduce the risks in the following groups of turning machines and turning centres, which are designed
primarily to shape metal by cutting.
— Group 1: Manually controlled turning machines without numerical control.
— Group 2: Manually controlled turning machines with limited numerically controlled capability.
— Group 3: Numerically controlled turning machines and turning centres.
— Group 4: Single- or multi-spindle automatic turning machines.
NOTE 1 For detailed information on the machine groups, see the definitions in 3.4 and mandatory and optional
modes of operation in 3.3.
NOTE 2 Requirements in this International Standard are, in general, applicable to all groups of turning
machines. If requirements are applicable to some special group(s) of turning machines only, then the special
group(s) of turning machine(s) is/are specified.
NOTE 3 Hazards arising from other metalworking processes (e.g. grinding and laser processing) are covered
by other International Standards (see Bibliography).
This International Standard covers the significant hazards listed in Clause 4 and applies to ancillary
devices (e.g. for workpieces, tools and work clamping devices, handling devices and chip handling
equipment), which are integral to the machine.
This International Standard also applies to machines which are integrated into an automatic production
line or turning cell inasmuch as the hazards and risks arising are comparable to those of machines
working separately.
This International Standard also includes a minimum list of safety-relevant information which the
manufacturer has to provide to the user. See also ISO 12100:2010, Figure 2, which illustrates the
interaction of manufacturer’s and user’s responsibility for the operational safety.
The user’s responsibility to identify specific hazards (e.g. fire and explosion) and reduce the associated
risks can be critical (e.g. whether the central extraction system is working correctly).
Where additional processes (milling, grinding, etc.) are involved, this International Standard can be
taken as a basis for safety requirements; for specific information see the Bibliography.
This International Standard applies to machines that are manufactured after the date of issue of this
International Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable to its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 230-5:2000, Test code for machine tools — Part 5: Determination of the noise emission
ISO 447:1984, Machine tools — Direction of operation of controls
ISO 702 (all parts), Machine tools — Connecting dimensions of spindle noses and work holding chucks
ISO 23125:2015(E)
ISO 841:2001, Industrial automation systems and integration — Numerical control of machines —
Coordinate system and motion nomenclature
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3746:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their
components
ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their
components
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment
ISO 6385:2004, Ergonomic principles in the design of work systems
ISO 8525:2008, Airborne noise emitted by machine tools — Operating conditions for metal-cutting
machines
ISO 9241 (all parts), Ergonomics of human-system interaction
ISO 9355-1, Ergonomic requirements for the design of displays and control actuators — Part 1: Human
interactions with displays and control actuators
ISO 9355-2, Ergonomic requirements for the design of displays and control actuators — Part 2: Displays
ISO 9355-3, Ergonomic requirements for the design of displays and control actuators — Part 3: Control
actuators
ISO 10218-2:2011, Robots and robotic devices — Safety requirements for industrial robots — Part 2: Robot
systems and integration
ISO 11161:2007+Amd.1:2010, Safety of machinery — Integrated manufacturing systems — Basic
requirements
ISO 11202:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate environmental
corrections
ISO 11204:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying accurate environmental
corrections
ISO 11228 (all parts), Ergonomics — Manual handling
ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2:2003, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13850:2006, Safety of machinery — Emergency stop — Principles for design
ISO 13851:2002, Safety of machinery — Two-hand control devices — Functional aspects and design
principles
2 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
ISO 13854:1996, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of
parts of the human body
ISO 13856-2:2005, Safety of machinery — Pressure-sensitive protective devices — Part 2: General
principles for the design and testing of pressure-sensitive edges and pressure-sensitive bars
ISO 13856-3:2013, Safety of machinery — Pressure-sensitive protective devices — Part 3: General
principles for design and testing of pressure-sensitive bumpers, plates, wires and similar devices
ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
ISO 14118:2000, Safety of machinery — Prevention of unexpected start-up
ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection
ISO 14120:2002, Safety of machinery — Guards — General requirements for the design and construction of
fixed and movable guards
ISO 14122-1:2001, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of
fixed means of access between two levels
ISO 14122-2:2001, Safety of machinery — Permanent means of access to machinery — Part 2: Working
platforms and walkways
ISO 14122-3:2001, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails
ISO 14122-4:2004, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders
ISO 14159:2002, Safety of machinery — Hygiene requirements for the design of machinery
ISO 15534-1:2000, Ergonomic design for the safety of machinery — Part 1: Principles for determining the
dimensions required for openings for whole-body access into machinery
ISO 15534-2:2000, Ergonomic design for the safety of machinery — Part 2: Principles for determining the
dimensions required for access openings
ISO 16156:2004, Machine-tools safety — Safety requirements for the design and construction of work
holding chucks
IEC 60204-1:2009, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60825-1:2007, Safety of laser products — Part 1: Equipment classification and requirements
IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for
industrial environments
IEC 61000-6-4:2011, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission
standard for industrial environments
IEC 61800-5-2:2007, Adjustable speed electrical power drive systems — Part 5-2: Safety requirements —
Functional
EN 954-1:1996, Safety of machinery — Safety-related parts of control systems — Part 1: General principles
for design
EN 1837:1999+A1:2009, Safety of machinery — Integral lighting of machines
ISO 23125:2015(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 13849-1:2006
and EN 954-1:1996 and the following apply.
3.1 General terms
3.1.1
turning machine
machine tool in which the principal movement is the rotation of the workpiece against the stationary
cutting tool(s)
3.1.2
manual control
mode of operation where each movement of the machine is individually initiated and controlled by the
operator
3.1.3
manually controlled turning machine
turning machine (3.1.1) for which process steps for the machining are controlled or started by an
operator without support by an NC-machining program
3.1.4
numerical control
NC
computerized numerical control
CNC
automatic control of a process performed by a device that makes use of numerical data introduced
while the operation is in progress
[SOURCE: ISO 2806:1994, 2.1.1]
3.1.5
numerically controlled turning machine
NC turning machine
turning machine that operates under numerical control (3.1.4) or computerized numerical control (CNC)
3.1.6
turning centre
numerically controlled turning machine (3.1.5) equipped with power-driven tools and the capability to
orientate the work holding spindle around its axis
Note 1 to entry: A turning centre can also include, but is not limited to, functions such as gauging, burnishing,
threading, boring, milling, grinding and drilling.
Note 2 to entry: If grinding processes are involved, see EN 13218 for additional safety measures.
3.1.7
work zone
space where metal cutting is to take place
3.1.8
performance level
PL
discrete level used to specify the ability of safety-related parts of control systems to perform a safety
function under foreseeable conditions
[SOURCE: ISO 13849-1:2006, 3.1.23]
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ISO 23125:2015(E)
3.1.9
mean time to dangerous failure
MTTF
d
expectation of the mean time to dangerous failure
[SOURCE: ISO 13849-1:2006, 3.1.25]
3.1.10
category
classification of safety-related parts of a control system in respect of its resistance to fault and its
subsequent behaviour in the fault condition, and which is achieved by the structural arrangement of the
parts and/or their reliability
[SOURCE: EN 954-1:1996, 3.2.]
3.2 Terms related to parts of turning machines
3.2.1
vision panel
window provided in a guard through which the operator can view the work zone (3.1.7) or other areas
of the machine
3.2.2
chuck
clamping device in which workpieces are clamped with the aid of either manual energy or pneumatic,
hydraulic or electric energy
Note 1 to entry: See Figure 1.
NOTE The chuck with 3 jaws is an example only, a chuck can have 2, 3, 4 or 6 jaws.
Figure 1 — Chuck
3.2.3
collet
device designed to hold the bar into the turning spindle, e.g. by pressure bar or draw bar
Note 1 to entry: See Figure 2.
ISO 23125:2015(E)
Figure 2 — Collet
3.2.4
electronic handwheel
manually operated control device which initiates and maintains an axis movement by pulse generation
input to the numerical control (3.1.4) during its rotation
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ISO 23125:2015(E)
3.3 Terms related to modes of operation — Mandatory and optional modes of
operation for turning machines
NOTE Table 1 gives an overview of the mandatory, optional or not allowed modes of operations for turning
machines. Table 1 is mandatory.
Table 1 — Overview of turning machine groups and modes of operation
Turning machines
Group 1 Group 2 Group 3 Group 4
Manually controlled Manually controlled Numerically con- Single- or multi-spin-
Mode
turning machines turning machines trolled turning ma- dle automatic turning
of operation
without numerical with limited capa- chines and turning machines
control bility of numerical centres
control
Mode 0
Mandatory Mandatory Optional Not allowed
manual mode
Mode 1 Mandatory
Not allowed Mandatory Mandatory
automatic mode limited Mode 1
a
Mode 2
Not allowed Optional Mandatory Mandatory
setting mode
a
Service mode Not allowed Optional Optional Optional
a
These modes are key protected and only available for well-trained and qualified staff (see 6.2.1). In order to allocate
the access, it may be necessary to provide different key switches (or other appropriate access means) for a turning machine.
For example:
— Key 1: Access to setting mode (and automatic mode) for setting staff;
— Key 2: Access to CNC program code and CNC-parameter modifications to adequately trained staff [see 5.8 b) 2)];
— Key 3: Access to service mode for service staff.
NOTE  In most applications, key switch 1 (setting mode) and key switch 2 (CNC program code access) can be identical.
3.3.1
Mode 0: manual mode
operation of the machine by the operator without NC functions or non-automatic mode of the machine
axes, where the operator has control over the machining process without the use of pre-programmed
operations
3.3.2
Mode 1: automatic mode
automatic, programmed, sequential operation of the machine with the facility for manual or automatic
loading/unloading of workpiece and tools, until stopped by program or operator
3.3.3
Mode 2: setting mode
mode of operation in which adjustments for the subsequent machining process are performed by the
operator
Note 1 to entry: Checking of tool or workpiece position (e.g. by touching the workpiece with a probe or tool) are
procedures of the setting mode (see 5.2.4.4).
3.3.4
service mode
mode for service and maintenance tasks, such as axis calibration by laser, ballbar testing and spindle
error analysis
Note 1 to entry: In service mode, the machining of a workpiece is not allowed (see 5.2.4.5).
ISO 23125:2015(E)
3.4 Terms related to sizes and groups of turning machines defined
NOTE With regard to the relevant hazards, the turning machines are subdivided into four different groups.
Group 1, Group 2 and Group 3 turning machines can then be subdivided into “small” or “large” sizes. See the
overview in Table 2.
Table 2 — Overview of sizes and groups of turning machines
Group Group name Subclause in Subdivision Subclause in
No. which group is in sizes which size is
defined defined
Small 3.4.1
Manually controlled turning machines with-
Group 1 3.4.3
out numerical control
Large 3.4.2
Small 3.4.1
Manually controlled turning machines with
Group 2 3.4.4
limited numerically controlled capability
Large 3.4.2
Small 3.4.1
Numerically controlled turning machines
Group 3 3.4.5
and turning centres
Large 3.4.2
Single- or multi-spindle automatic turning
Group 4 3.4.6 No subdivision —
machines
3.4.1
small turning machine
turning machine within the following dimensional limits:
— horizontal spindle turning machines and turning centres with distance between centres (BC) up to
and including 2 000 mm and which are designed to accept workpiece clamping devices of up to and
including 500 mm outside diameter;
— vertical turning machines, inverted spindle turning machines including pick-up machines and
turning centres, which are designed to accept workpiece clamping devices of up to and including
500 mm outside diameter
3.4.2
large turning machine
turning machine which exceeds the following dimensional limits:
— horizontal spindle turning machines and turning centres with distance between centres exceeding
2 000 mm or which are designed to accept work clamping devices exceeding 500 mm outside
diameter;
— vertical turning machines, inverted spindle turning machines, including pick-up machines, and
turning centres which are designed to accept work clamping devices exceeding 500 mm outside
diameter
3.4.3
Group 1: manually controlled turning machine without numerical control
turning machine, where all movements are initiated and controlled by the operator, one at a time
Note 1 to entry: This group of turning machines may be equipped with the following features:
— mechanical facilities for mechanical feed or thread cutting;
— electronic facilities for constant surface speed (CSS);
— copying attachments (cam, template, etc.);
— but shall have no limited or full numeric control system (NC).
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
8 © ISO 2015 – All rights reserved

ISO 23125:2015(E)
Key
1 rear spindle end guard 3 front chip/splash guard (saddle mounted)
2 chuck guard 4 rear chip/splash guard
Figure 3 — Group 1: Example of a manually controlled, horizontal spindle turning machine
3.4.4
Group 2: manually controlled turning machine with limited numerically controlled capability
turning machine that can be operated as a Group 1 machine by the use of electronic handwheels or as a
machine with limited NC control by operating controls on NC panel
Note 1 to entry: This group of turning machines may be equipped with some or all of the features of Group 1
turning machines (manual turning machines without NC) and the following:
— a limited numeric control system (NC) providing:
— constant surface speed (CSS);
— axis interpolation (i.e. copying/predefined profiling);
— thread cutting cycles.
However, the following features shall not be provided:
— automatic program start;
— automatic initiated tool change, turret indexing or tailstock quill advance or retract;
— unlimited rapid axis movements;
— automatic workpiece change or bar feed system.
ISO 23125:2015(E)
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
Key
1 rear spindle guard 3 rear guard
2 front guard 4 chuck guard
NOTE The partial enclosure comprises 2 and 3.
Figure 4 — Group 2: Example of a manually controlled turning machine with limited NC
capability
3.4.5
Group 3: numerically controlled turning machine and turning centre
turning machine with numerical control (NC) providing automatic function
Note 1 to entry: This group of turning machines may be equipped with some or all of the following features:
— a numeric control system (NC);
— automatic workpiece change or bar feed systems;
— automatic tool magazine, tool transfer and tool changing systems;
— automatic turret indexing or tailstock quill advance or retract;
— counter work holding spindle;
— double work holding spindle;
— secondary machining operations (e.g. milling, grinding, drilling);
— ancillary handling devices.
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ISO 23125:2015(E)
However, it shall not be equipped with a rotating work holding spindle carrier, which moves the work holding
spindle(s) from station to station.
For mandatory and optional modes of operation for this group of turning machines, see Table 1.
Key
1 vision panel 4 chips conveyor
2 interlocked movable guards 5 work zone
3 enclosing guard 6 main control panel
Figure 5 — Group 3: Example of a small horizontal turning machine
ISO 23125:2015(E)
Key
1 rear guard 5 control panel
2 chuck guard 6 platform
3 access door 7 saddle
4 front guard
Figure 6 — Group 3: Example of a large horizontal NC turning machine
Key
1 perimeter fence
2 platform
Figure 7 — Group 3: Example of a large vertical NC turning machine with operating platform
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ISO 23125:2015(E)
3.4.6
Group 4: single- or multi-spindle automatic turning machine
horizontal or vertical spindle turning machine, designed for batch production of parts according to an
NC and/or mechanical (e.g. by cam or template) pre-set program with fixed sequence of operation
Note 1 to entry: This group of turning machines may be equipped with some or all of the following features:
— a spindle carrier holding two or more work holding spindles, equipped with either power-operated chucks or
collets;
— additional features e.g. power-driven tools and one or more sub/counter spindles;
— the drives of the work holding spindles, tool spindles and sub/counter spindles may be by common and/or
independent drives.
However, this group shall have no manually operated chucks.
For mandatory and optional modes of operation for this group of turning machines, se
...