prEN ISO 19085-20

SLOVENSKI STANDARD
01-november-2024
Varnost lesnoobdelovalnih strojev - Krožne žage - 11. del: Polavtomatske
horizontalne krožne žage za prečni rez z eno rezalno enoto (radialne žage)
(ISO/DIS 19085-20:2024)
Woodworking machines - Safety - Part 20: Horizontal cutting cross-cut sawing machines
with one saw unit (radial arm saws) (ISO/DIS 19085-20:2024)
Sicherheit von Holzbearbeitungsmaschinen - Kreissägemaschinen - Teil 11:
Halbautomatische waagrecht schneidende Auslegerkreissägemaschinen mit einem
Sägeaggregat (Radialsägen) (ISO/DIS 19085-20:2024)
Machines à bois - Sécurité - Partie 20: Tronçonneuses à coupe horizontale avec une
unité de sciage (scies à bras radial) (ISO/DIS 19085-20:2024)
Ta slovenski standard je istoveten z: prEN ISO 19085-20
ICS:
13.110 Varnost strojev Safety of machinery
25.080.60 Strojne žage Sawing machines
79.120.10 Lesnoobdelovalni stroji Woodworking machines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 19085-20
ISO/TC 39/SC 4
Woodworking machines — Safety —
Secretariat: UNI
Part 20:
Voting begins on:
Horizontal cutting cross-cut sawing 2024-09-10
machines with one saw unit (radial
Voting terminates on:
2024-12-03
arm saws)
ICS: 13.110; 79.120.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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Reference number
ISO/DIS 19085-20:2024(en)
DRAFT
ISO/DIS 19085-20:2024(en)
International
Standard
ISO/DIS 19085-20
ISO/TC 39/SC 4
Woodworking machines — Safety —
Secretariat: UNI
Part 20:
Voting begins on:
Horizontal cutting cross-cut sawing
machines with one saw unit (radial
Voting terminates on:
arm saws)
ICS: 13.110; 79.120.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 19085-20:2024(en)
ii
ISO/DIS 19085-20:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Safety requirements and measures for controls . 5
4.1 Safety and reliability of control systems.5
4.2 Control devices .5
4.3 Start .6
4.3.1 Direct start .6
4.3.2 Start via control power-on .6
4.3.3 Power-operated cutting stroke .6
4.4 Safe stops .7
4.4.1 General .7
4.4.2 Normal stop .7
4.4.3 Operational stop .7
4.4.4 Emergency stop .7
4.5 Braking function of tools .7
4.6 Mode selection .7
4.7 Tool speed changing .7
4.7.1 Speed changing by shifting the belts on the pulleys .7
4.7.2 Speed changing by incremental speed change motor .7
4.7.3 Infinitely variable speed by frequency inverter .7
4.8 Failure of any power supply .7
4.9 Manual reset control .7
4.10 Standstill detection and monitoring .8
4.11 Machine moving parts speed monitoring.8
4.12 Time delay.8
4.13 Teleservice .8
4.14 Power operated tilting of the saw unit .8
5 Safety requirements and measures for protection against mechanical hazards . 8
5.1 Stability .8
5.2 Risk of break-up during operation .8
5.3 Tool and tool fixing design .9
5.3.1 General .9
5.3.2 Spindle locking .9
5.3.3 Circular saw blade fixing device .9
5.3.4 Flange dimension for circular saw blades .9
5.4 Braking .9
5.4.1 Braking of tools .9
5.4.2 Maximum run-down time .9
5.4.3 Brake release .9
5.5 Safeguards .9
5.5.1 Fixed guards .9
5.5.2 Interlocking moveable guards .9
5.5.3 Hold-to-run control .10
5.5.4 Two-hand control .10
5.5.5 Electro-sensitive protective equipment (ESPE) .10
5.5.6 Pressure sensitive protective equipment (PSPE) .10
5.5.7 Enabling control .10
5.6 Prevention of access to hazardous moving parts .10
5.6.1 Safeguarding the saw blade in machines with manually operated cutting stroke .10
5.6.2 Safeguarding the saw blade in machines with power-operated cutting stroke . 12

iii
ISO/DIS 19085-20:2024(en)
5.6.3 Pivoting of the saw unit . 13
5.6.4 Tilting of the saw unit . 13
5.6.5 Guarding of drives . 13
5.7 Impact hazard . 13
5.8 Clamping devices . 13
5.9 Measures against ejection .14
5.9.1 General .14
5.9.2 Guards materials and characteristics .14
5.10 Workpiece supports and guides . .14
5.10.1 Workpiece supports .14
5.10.2 Workpiece guides . 15
6 Safety requirements and measures for protection against other hazards .15
6.1 Fire . 15
6.2 Noise . 15
6.2.1 Noise reduction at the design stage . 15
6.2.2 Noise emission measurement and declaration .16
6.3 Emission of chips and dust .16
6.4 Electricity .16
6.5 Ergonomics and handling .16
6.6 Lighting .16
6.7 Pneumatics .16
6.8 Hydraulics .16
6.9 Electromagnetic compatibility.16
6.10 Laser .16
6.11 Static electricity.16
6.12 Errors of fitting .17
6.13 Isolation .17
6.14 Maintenance .17
6.15 Relevant but not significant hazards .17
7 Information for use . 17
7.1 Warning devices .17
7.2 Marking .17
7.2.1 General .17
7.2.2 Additional markings .17
7.3 Instruction handbook.18
7.3.1 General .18
7.3.2 Additional information .18
Annex A (informative) List significant hazards .20
Annex B (informative) Performance levels required .22
Annex C (normative) Stability test . .23
Annex D (normative) Test for braking function .24
Annex E (normative) Impact test for guards . .25
Annex F (normative) Noise test code . .26
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered .29

iv
ISO/DIS 19085-20:2024(en)
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 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 39, Machine tools, Subcommittee SC 4
Woodworking machines, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 142, Woodworking machines, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This document replaces EN 1870-11:2013 and EN 1870-17:2012, which have been technically revised and
combined.
A list of all parts in the ISO 19085 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
ISO/DIS 19085-20:2024(en)
Introduction
The ISO 19085 series provides technical safety requirements for the design and construction of
woodworking machinery, as well as for the content of the relevant instruction handbook. It concerns
designers, manufacturers, suppliers and importers of the machines specified in the Scope.
This document is a type-C standard as defined in ISO 12100:2010.
This document is of relevance, in particular, for the following stakeholder groups representing the market
players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (e.g. regulators, accident prevention organisations, market surveillance).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, for example, for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate in the drafting
process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are
covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or type-B
standards (as defined in ISO 12100:2010), the requirements of this type-C standard take precedence over
the requirements of the other standards for machines that have been designed and built according to the
requirements of this type-C standard.
The full set of requirements for a particular type of woodworking machine are those given in the part of the
ISO 19085 series applicable to that type, together with the relevant requirements from ISO 19085-1:2021, to
the extent specified in the Scope of the applicable part of the ISO 19085 series.
As far as possible, the safety requirements of parts of the ISO 19085 series refer to the relevant clauses
of ISO 19085-1:2021. Each part includes replacements and additions to the common requirements given in
ISO 19085-1:2021.
All parts of the ISO 19085 series have the same structure, so that reference to ISO 19085-1:2021 is made
always and only from and to the same subclause number, last indent.
Clauses 1 to 3 are specific to each part and, therefore are distinct from ISO 19085-1:2021, Clauses 1 to 3.
For Clauses 4 to 7 and the annexes, each subclause in ISO 19085-1:2021, is cited as:
— confirmed as a whole;
— confirmed with additions;
— excluded in total; or
— replaced with specific text.
This is indicated by one of the following possible statements:
— “ISO 19085-1:2021, [subclause/Annex], applies.”;

vi
ISO/DIS 19085-20:2024(en)
— “ISO 19085-1:2021, [subclause/Annex], applies with the following additions.” or “ISO 19085-1:2021,
[subclause/Annex], applies with the following additions, subdivided into further specific subclauses.”;
— “ISO 19085-1:2021, [subclause/Annex], does not apply.”;
— “ISO 19085-1:2021, [subclause/Annex], is replaced by the following text.” or “ISO 19085-1:2021,
[subclause/Annex], is replaced by the following text, subdivided into further specific subclauses.”.
Other subclauses and annexes specific to this document are indicated by the introductory sentence:
“Subclause/Annex specific to this document.”

vii
DRAFT International Standard ISO/DIS 19085-20:2024(en)
Woodworking machines — Safety —
Part 20:
Horizontal cutting cross-cut sawing machines with one saw
unit (radial arm saws)
1 Scope
This document specifies the safety requirements and measures for horizontal cutting cross-cut sawing
machines with one saw unit (radial arm saws) with manual loading or unloading of the workpiece or both
and capable of continuous production use, hereinafter referred to also as “machines”.
The machines are designed to cut solid wood and material with similar physical characteristics to wood, as
well as:
— aluminium profiles also filled or composed with plastic or foam or rubber based insulating materials;
— composite materials, with core consisting of e.g. polyurethane or mineral material, laminated with
light alloy;
— polymer-matrix composite materials and reinforced with thermoplastic or thermoset or elastomeric
materials;
— fibreglass;
— composite bars made from the materials listed above.
This document deals with all significant hazards, hazardous situations and events as listed in Annex A
relevant to the machines when operated, adjusted and maintained as intended and under the conditions
foreseen by the manufacturer; reasonably foreseeable misuse has been considered too. Transport, assembly,
dismantling, disabling and scrapping phases have also been taken into account.
This document does not deal with hazards related to power operated pivoting.
This document does not apply to:
a) machines designed for cross cutting of logs;
b) machines designed for sawing and/or milling roof timber frames;
c) machines fitted with hydraulic braking systems;
d) machines fitted with hydraulically powered machine actuators;
e) machines fitted with power-operated workpiece positioning system;
f) machines fitted with the facility for ripping, milling (including trenching and grooving), sanding and/or
drilling;
g) machines intended for use in potentially explosive atmosphere;
h) machines manufactured prior to the publication of this document.

ISO/DIS 19085-20:2024(en)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 19085-1:2021, Woodworking machines — Safety — Part 1: Common requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 19085-1:2021 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
horizontal cutting cross-cut circular sawing machine with one saw unit (radial arm saw)
machine where the saw unit is moved horizontally forward along a support e.g. an arm in a straight line
through the workpiece during the cut and then back to its rest position
Note 1 to entry: See Figures 1 a) b), c) for examples of radial arm saws.
Note 2 to entry: The radial arm can rotate around a vertical axis (pivoting or swivelling) and the saw unit can rotate
around a horizontal axis (tilting or canting) parallel to the radial arm.
Note 3 to entry: The workpiece is manually positioned on and removed from the workpiece support.

ISO/DIS 19085-20:2024(en)
a) radial arm saw with manual cutting stroke, with automatic adjustable guards

ISO/DIS 19085-20:2024(en)
b) radial arm saw with manual cutting stroke, with fixed guards

ISO/DIS 19085-20:2024(en)
c) radial arm saw with power operated cutting stroke
Figure 1 — Examples of radial arm saws
3.2
cutting stroke
feed movement of the saw unit incorporating the tool to perform the cut followed by the return of the saw
unit to its rest position
Note 1 to entry: The cutting stroke can be manually operated or power operated.
3.3
initiation control
control which after actuation enables providing power to specific machine actuators, e.g. by a programmable
logic control
4 Safety requirements and measures for controls
4.1 Safety and reliability of control systems
ISO 19085-1:2021, 4.1, applies with the following additions.
Annex B provides an informative summary table of Performance Levels (PL) specified in Clauses 4 and 5 for
each safety function.
4.2 Control devices
ISO 19085-1:2021, 4.2, applies with the following additions.

ISO/DIS 19085-20:2024(en)
The control devices for start and stop of the drive for the saw spindle and for clamping, if fitted, shall be
located together either below the workpiece support at the front of the machine, or on a control panel
positioned:
a) behind and above the fence,
b) within 850 mm measured horizontally from the front edge of the workpiece support,
c) at a maximum height of 1 600 mm from the floor level.
On machines with manually operated cutting stroke, the control for spindle drive start and stop may also be
incorporated in, or adjacent to the handle for operating the saw unit of the machine, but not far more than
600 mm from front edge of the workpiece support when the saw unit is in its rest position.
The control device for clamping may also be a foot pedal positioned within 1,0 m of the cutting line when it is
at 90° to the fence. The foot pedal shall be shrouded against unintentional activation. The force required to
actuate the foot pedal shall not exceed 50 N.
On machines with power-operated cutting stroke a two-hand control device shall be provided, and
positioned:
1) at the front of the machine within 1,0 m of the cutting line when it is at 90° to the fence;
2) below the workpiece support;
3) at a minimum height above floor level of 750 mm.
On machines with power-operated cutting stroke, If the control device for clamping is separate from the
two-hand control device, it shall be within 400 mm measured horizontally to the two-hand control device.
On machines with power-operated cutting stroke, an emergency stop device shall be positioned within
500 mm from the two-hand control device.
4.3 Start
4.3.1 Direct start
ISO 19085-1:2021, 4.3.1, applies to machines with manually operated cutting stroke.
4.3.2 Start via control power-on
ISO 19085-1:2021, 4.3.2, applies to machines with power-operated cutting stroke.
4.3.3 Power-operated cutting stroke
Subclause specific to this document.
On machines with power-operated cutting stroke, the cutting stroke shall only be capable of being started
when the saw blade rotation, and powered workpiece clamping, if fitted, have been initiated, and the power
operated movable guard required in 5.6.2 is closed.
The SRP/CS for the interlocking of the power operated cutting stroke with the saw blade rotation shall
achieve PL = c.
r
The SRP/CS for the interlocking of the power operated cutting stroke with the workpiece clamping shall
achieve PL = c.
r
The SRP/CS for the interlocking of the power operated cutting stroke with the closed position of the
moveable guard shall achieve PL = c.
r
Verification is done by checking the relevant drawings, circuits diagrams, inspection of the machine and
relevant functional testing of the machine.

ISO/DIS 19085-20:2024(en)
4.4 Safe stops
4.4.1 General
ISO 19085-1:2021, 4.4.1, applies with the following additions.
On machines with power-operated cutting stroke, the stopping sequence shall be as follows:
a) initiate the return stroke of the saw blade;
b) stop the tool drive in stop category 0 or 1.
After stopping, powered workpiece clamping devices may be de-energized if no additional hazard occurs.
4.4.2 Normal stop
ISO 19085-1:2021, 4.4.2, applies.
4.4.3 Operational stop
ISO 19085-1:2021, 4.4.3, does not apply.
4.4.4 Emergency stop
ISO 19085-1:2021, 4.4.4, applies to machines with power-operated cutting stroke only.
4.5 Braking function of tools
ISO 19085-1:2021, 4.5, applies.
4.6 Mode selection
ISO 19085-1:2021, 4.6, does not apply.
4.7 Tool speed changing
4.7.1 Speed changing by shifting the belts on the pulleys
ISO 19085-1:2021, 4.7.1, applies.
4.7.2 Speed changing by incremental speed change motor
ISO 19085-1:2021, 4.7.2, applies.
4.7.3 Infinitely variable speed by frequency inverter
ISO 19085-1:2021, 4.7.3, applies with the following additions.
Requirements on speed monitoring stated in ISO 19085 1:2021, 4.7.3, apply to the maximum rotational
speed set by the manufacturer for the saw blade.
4.8 Failure of any power supply
ISO 19085-1:2021, 4.8, applies.
4.9 Manual reset control
ISO 19085-1:2021, 4.9, does not apply.

ISO/DIS 19085-20:2024(en)
4.10 Standstill detection and monitoring
ISO 19085-1:2021, 4.10, does not apply.
4.11 Machine moving parts speed monitoring
ISO 19085-1:2021, 4.11, does not apply.
4.12 Time delay
ISO 19085-1:2021, 4.12, applies.
4.13 Teleservice
ISO 19085-1:2021, 4.13, does not apply.
4.14 Power operated tilting of the saw unit
Subclause specific to this document.
Power-operated tilting of saw unit may be provided only on machines with power operated cutting stroke.
Power-operated tilting of saw unit shall only be possible under pre-set electronic control after actuation of
an initiation control device, or by hold-to-run control.
The SRP/CS for initiation control shall achieve PL = c.
r
Unexpected start of power-operated tilting of the saw unit under pre-set electronic control shall be
prevented after the pre-set position has been reached. This can be achieved, for example, by a time delay
device, which, after actuation of the initiation control power-operated tilting of the saw unit, cuts power to
the actuators with a time delay set to the maximum possible adjustment time.
The SRP/CS for power cut-off by time delay shall achieve PLr = c.
The power operated tilting of the saw unit shall only be possible with the interlocking movable guard
required in 5.6.2 in its closed position and with the saw blade in its rest position.
The SRP/CS for interlocking of the power operated tilting of the saw unit with the moveable guard in its
closed position shall achieve PL = c.
r
The SRP/CS for interlocking of the power operated tilting of the saw unit with the saw blade in its rest
position shall achieve PL = c.
r
Verification is done by checking the relevant drawings, circuits diagrams, inspection of the machine and
relevant functional testing of the machine.
5 Safety requirements and measures for protection against mechanical hazards
5.1 Stability
ISO 19085-1:2021, 5.1, applies with the following additions.
The stability tests for machines provided with an integrated device for moving shall be carried out in
accordance with Annex C.
5.2 Risk of break-up during operation
ISO 19085-1:2021, 5.2, applies with the following additions.
The workpiece support and the fence shall be made of easily machinable material (see ISO 19085-1:2021, 3.3).

ISO/DIS 19085-20:2024(en)
As an exception on machines without the facility for pivoting the saw unit, the workpiece support may be
made of any material but shall be fitted with a replaceable table insert made with easily machinable material,
which shall be held in position such that it would not be dislodged in the event of contact with the saw blade.
If the saw blade in its rest position is guarded by an enclosure, the slot in this enclosure for the saw blade to
pass shall be lined with easily machinable material.
5.3 Tool and tool fixing design
5.3.1 General
ISO 19085-1:2021, 5.3.1, applies.
5.3.2 Spindle locking
ISO 19085-1:2021, 5.3.2, applies.
5.3.3 Circular saw blade fixing device
ISO 19085-1:2021, 5.3.3, applies.
5.3.4 Flange dimension for circular saw blades
ISO 19085 1:2021, 5.3.4 applies with the following additions.
As an exception for saw blades greater than 450 mm diameter, the diameter of the flanges shall be at least
D/6 but not less than 110 mm.
5.4 Braking
5.4.1 Braking of tools
ISO 19085-1:2021, 5.4.1, applies.
5.4.2 Maximum run-down time
ISO 19085-1:2021, 5.4.2, applies.
5.4.3 Brake release
ISO 19085-1:2021, 5.4.3, applies.
5.5 Safeguards
5.5.1 Fixed guards
ISO 19085-1:2021, 5.5.1, applies.
5.5.2 Interlocking moveable guards
5.5.2.1 General
ISO 19085-1:2021, 5.5.2.1, applies with the following additions.
Additional measures according to ISO 14119:2013, 7.2 are not required.
NOTE The motivation to defeat the interlocking devices in reasonably foreseeable manner does not exist.

ISO/DIS 19085-20:2024(en)
5.5.2.2 Moveable guards with interlocking
ISO 19085-1:2021, 5.5.2.2, applies.
5.5.2.3 Moveable guards with interlocking and guard locking
ISO 19085-1:2021, 5.5.2.3, does not apply.
5.5.3 Hold-to-run control
ISO 19085-1:2021, 5.5.3, applies.
5.5.4 Two-hand control
ISO 19085-1:2021, 5.5.4, applies.
5.5.5 Electro-sensitive protective equipment (ESPE)
ISO 19085-1:2021, 5.5.5, does not apply.
5.5.6 Pressure sensitive protective equipment (PS
...