prEN 13236

Safety requirements for superabrasive products

This document applies to superabrasives products containing natural or synthetic diamond or cBN (cubic boron nitride). It includes precision grinding and cutting-off wheels, non-precision cutting-off wheels, diamond wires, mounted points and other superabrasive products for non-precision grinding. It also applies to reconditioned superabrasive cutting-off wheels.
This document specifies requirements and/or measures for the removal or reduction of hazards resulting from the design and application of the superabrasive products.
This document contains also procedures and tests for verification of the compliance with the requirements as well as safety information for use, which will be made available to the user by the manufacturer.
This document does not apply to bonded abrasive products, coated abrasive products, rotating dressing tools, truers or any non-rotating superabrasive products.

Sicherheitsanforderungen für Schleifwerkzeuge mit Diamant oder Bornitrid

Prescriptions de sécurité pour les produits superabrasifs

Varnostne zahteve za superabrazivne izdelke

Ta dokument se nanaša na superabrazivne izdelke, ki vsebujejo naravni ali sintetični diamant ali cBN (kubični borov nitrid). Vključuje precizne brusne in rezalne plošče, neprecizne rezalne plošče, diamantne žice, vpenjalne točke in druge superabrazivne izdelke za neprecizno brušenje. Prav tako se nanaša na obnovljene superabrazivne rezalne plošče.
Ta dokument določa zahteve in/ali ukrepe za odstranitev ali zmanjšanje nevarnosti, ki izhajajo iz zasnove in uporabe superabrazivnih izdelkov.
Ta dokument vsebuje tudi postopke in teste za preverjanje skladnosti z zahtevami ter varnostne informacije za uporabo, ki jih bo uporabniku zagotovil proizvajalec.
Ta dokument se ne nanaša na vezane abrazivne izdelke, prevlečene abrazivne izdelke, rotacijska orodja za dresiranje, trimerje ali katerikoli nerotacijski superabrazivni izdelki.

General Information

• Status: Not Published
• Publication Date: 27-Sep-2027
• ICS: 25.100.70 - Abrasives
• Technical Committee: CEN/TC 143 - Machine tools - Safety
• Drafting Committee: CEN/TC 143/WG 2 - Stationary grinding machines and abrasive products - Safety
• Current Stage: 4010 - Start of draft translation - Enquiry
• Start Date: 29-May-2026
• Completion Date: 23-Apr-2026
• Ref Project: oSIST prEN 13236:2026 - Safety requirements for superabrasive products

Relations

• Revises: EN 13236:2019 - Safety requirements for superabrasive products
• Effective Date: 25-Jun-2025

Overview

prEN 13236: Safety Requirements for Superabrasive Products is a key draft European Standard developed by CEN/TC 143, focusing on enhancing safety in the design and application of superabrasive products. This standard covers superabrasive tools containing natural or synthetic diamond or cBN (cubic boron nitride), including both precision and non-precision grinding and cutting-off wheels, diamond wires, mounted points, and related products. The document outlines comprehensive requirements and procedures to minimize hazards, ensures compliance through specific tests, and provides essential safety information for users.

prEN 13236 applies directly to products used for precision and non-precision grinding as well as cutting-off operations for industrial materials like stone, ceramics, and concrete. Importantly, it also includes reconditioned superabrasive cutting-off wheels, underlining the commitment to safety throughout the lifecycle of these products.

Key Topics

• Scope and Applicability: The standard applies to a broad range of superabrasive tools, but excludes bonded/ coated abrasives, dressing tools, truers, and non-rotating superabrasives.
• Hazard Identification: Emphasizes removal or reduction of risks such as ejection of parts, vibration, grinding debris, and kickback linked to improper design, handling, or use.
• Design and Manufacturing Requirements: Details safety-focused requirements for materials, construction, tolerances, and mounting of superabrasive products to resist normal operational loads.
• Safety Factors and Maximum Speeds: Sets clear parameters for maximum operating speeds, safety factors against bursting, and speed sequences for different product types and machine configurations.
• Verification and Compliance Procedures: Specifies visual inspection, mechanical testing (e.g., ring tests, strength and shear tests), and marking requirements to ensure products consistently meet safety standards.
• Marking and User Information: Mandates consistent product marking for traceability and provides detailed safety instructions, facilitating correct selection and usage by end-users and machine manufacturers.
• Reconditioned Products: Addresses the requirements for recertifying and marking reconditioned cutting-off wheels, ensuring ongoing safety after refurbishment.

Applications

prEN 13236 is crucial across various sectors where superabrasive products are used, including:

• Industrial Grinding and Cutting: Precision and non-precision operations on materials like glass, stone, concrete, and industrial ceramics.
• Construction and Masonry: Wheels and wires used on stationary, mobile, and hand-held machines for cutting bricks, tiles, and large stone elements.
• Tool Manufacturing and Reconditioning: Ensures manufacturers and service providers can safely produce and refurbish superabrasive products for extended service life.
• Machinery Integration: Provides machinery manufacturers with clear criteria for compatible superabrasive products, contributing to the overall conformity of their machines to the EU Machinery Directive and General Product Safety Directive.
• Maintenance and Safety Compliance: Offers safety guidance for workshops and operators in handling, mounting, and storing superabrasive products, mitigating risks of breakage and injury.

Related Standards

Organizations and professionals referencing prEN 13236 should also consult:

• EN ISO 286-2: Geometrical product specifications - Tolerance standards for holes and shafts.
• EN ISO 16089: Safety measures for grinding machines.
• EN ISO 11148-7/9, EN 60745-2-3, EN ISO 19432: Safety standards for various hand-held and powered machines used in conjunction with superabrasive products.
• Existing EN 13236:2019: The previous edition, for understanding significant technical changes introduced in the draft.

Adopting prEN 13236 delivers robust, standardized safety requirements for manufacturers, suppliers, and users of superabrasive products, supporting a culture of safety, regulatory compliance, and product quality throughout the EU and beyond.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2026
Varnostne zahteve za superabrazivne izdelke
Safety requirements for superabrasive products
Sicherheitsanforderungen für Schleifwerkzeuge mit Diamant oder Bornitrid
Prescriptions de sécurité pour les produits superabrasifs
Ta slovenski standard je istoveten z: prEN 13236
ICS:
25.100.70 Brusiva Abrasives
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 25.100.70 Will supersede EN 13236:2019
English Version
Safety requirements for superabrasive products
Prescriptions de sécurité pour les produits Sicherheitsanforderungen für Schleifwerkzeuge mit
superabrasifs Diamant oder Bornitrid
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 143.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13236:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 General . 6
3.2 Grinding and cutting-off machines . 6
3.3 Grinding and cutting-off methods . 7
3.4 Type of application . 7
3.5 Symbols . 9
4 List of significant hazards . 10
5 Safety requirements . 10
5.1 General requirements . 10
5.2 Requirements for precision superabrasive grinding and cutting-off wheels . 10
5.2.1 Bore tolerances . 10
5.2.2 Sequence of maximum operating speeds . 11
5.2.3 Safety factors . 11
5.2.4 Maximum operating speeds . 11
5.2.5 Blotters . 12
5.3 Requirements for non-precision cutting-off wheels . 12
5.3.1 Bore tolerances . 12
5.3.2 Sequence of maximum operating speeds . 13
5.3.3 Safety factors . 13
5.3.4 Maximum operating speeds . 13
5.3.5 Requirements for the blank . 13
5.3.6 Requirements for the connection of the superabrasive section to the blank . 17
5.3.7 Tensioning of non-precision cutting-off wheels . 18
5.3.8 Limitation of side coating of abrasive grain and/or superabrasive grain . 18
5.4 Requirements for diamond wires . 19
5.4.1 General . 19
5.4.2 Requirements . 19
5.4.3 Maximum operating speeds . 20
5.5 Requirements for mounted points . 20
5.5.1 Spindle diameter tolerances . 20
5.5.2 Sequence of maximum operating speeds . 20
5.5.3 Safety factors . 20
5.6 Requirements for other superabrasive products for non-precision grinding . 20
5.6.1 Bore diameter tolerances . 20
5.6.2 Sequence of maximum operating speeds . 20
5.6.3 Safety factors . 21
5.6.4 Maximum operating speeds . 21
5.6.5 Requirements for the connection of the abrasive section to the core . 21
5.7 Marking . 22
6 Verification of the safety requirements . 22
6.1 Verification of the general requirements . 22
6.1.1 General . 22
6.1.2 Visual inspection . 22
6.1.3 Ring test . 22
6.2 Verification of the strength requirements . 22
6.2.1 Verification of the safety factor . 22
6.2.2 Verification of the bending moment of non-precision cutting-off wheels . 22
6.2.3 Verification of the strength requirements for other superabrasive products for
non-precision grinding . 26
6.2.4 Verification methods for diamond wires . 28
6.3 Verification of marking . 31
6.4 Verification of the requirements for blotters . 31
6.5 Verification of the tensioning of non-precision cutting-off wheels . 31
7 Information for use . 32
Annex A (normative) Marking . 34
A.1 Content of the marking . 34
A.1.1 Marking requirements . 34
A.1.2 Additional inscriptions . 37
A.2 Execution of marking . 37
Annex B (informative) Mounted points . 38
B.1 Example of calculation of the maximum permissible speed of rotation . 38
B.2 Example for the application of the calculation method . 41
B.2.1 Types of mounted points . 41
B.2.2 Assumptions for the calculation . 41
B.2.3 Maximum permissible speeds of rotation . 42
Annex C (normative) Reconditioning of cutting-off wheels according to 5.3.6.4 . 43
C.1 Preconditions for reconditioning . 43
C.2 Additional marking requirements . 43
Annex D (normative) Speed conversion table . 44
Bibliography . 48
European foreword
This document (prEN 13236:2026) by Technical Committee CEN/TC"Machine tools - Safety", the
secretariat of which is held by SNV.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13236:2019.
a) replaced Formula (2) by Table 12 with minimum bending moments in 5.3.6.3;
b) changes to centrifugal force test in 6.2.1;
c) changes to shear strength test in 6.2.3.1;
d) added new Figure 8 in 6.2.3.1;
e) flangé diameter for tensioning in 6.5 has been added.
Introduction
This document has been prepared to provide one means of conforming with essential safety
requirements, e.g. of the General Product Safety Directive and associated EFTA regulations.
This document is addressed to designers, manufacturers and suppliers of the superabrasive products
described in the scope as well as to those who are reconditioning superabrasive cutting-off wheels. In
addition, it helps designers, manufacturers and suppliers of grinding machines in the selection of
superabrasive products, in order to reduce the risks and achieve conformity of the respective machinery
with the essential health and safety requirements of the Machinery Directive.
The extent to which hazards are covered is indicated in the scope of this document.
1 Scope
This document applies to superabrasive products containing natural or synthetic diamond or cBN (cubic
boron nitride). It includes precision grinding and cutting-off wheels, non-precision cutting-off wheels,
diamond wires, mounted points and other superabrasive products for non-precision grinding. It also
applies to reconditioned superabrasive cutting-off wheels.
This document spécifiés requirements and/or measures for the removal or reduction of hazards
resulting from the design and application of the superabrasive products.
This document contains also procedures and tests for vérification of the compliance with the
requirements as well as safety information for use, which will be made available to the user by the
manufacturer.
This document does not apply to bonded abrasive products, coated abrasive products, rotating dressing
tools, truers or any non-rotating superabrasive products.
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.
EN ISO 286-2:2010, Geometrical product specifications (GPS) - ISO code system for tolerances on linear
sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts (ISO 286-2:2010)
3 Terms, definitions and symbols
For the purposes of this document, the following terms and définitions apply/ the terms and définitions
given in. and the following apply.
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 General
3.1.1
superabrasive product
abrasive product containing natural or synthetic diamond or cubic boron nitride in a bond
3.2 Grinding and cutting-off machines
3.2.1
stationary machine
machine being fixéd in position during operation
Note 1 to entry: See, for example, EN ISO 16089 [1].
Note 2 to entry: Included are fixéd swing frame machines and mobile machines clamped firmly in position
during use.
Note 3 to entry: Transportable machines are fixéd in position during operation and therefore considered to be
stationary machines.
3.2.2
stationary machine with totally enclosed working area
stationary machine being protected by separating guards in such a way that machining processes
including loading and unloading of workpieces are carried out inside them and persons are protected
against hazards generated by bursting of an abrasive product
3.2.3
mobile machine
machine not being fixéd in position during operation
Note 1 to entry: Mobile machines are manually guided (but not hand-held) by the operator during use, e.g. floor
grinding machines.
3.2.4
hand-held machine
machine being held in the hand during operation
Note 1 to entry: Included are machines with fléxiblé drives.
Note 2 to entry: See for example EN ISO 11148-7 [2] , EN ISO 11148-9 [3], EN 60745-2-3 [4] and EN ISO 19432 [5].
3.3 Grinding and cutting-off methods
3.3.1
peripheral grinding
grinding with the periphery of the wheel with no or limited side loads
3.3.2
face grinding
grinding with the face of the wheel
3.3.3
cutting-off
cutting-off or slotting with the periphery of the cutting-off wheel
3.4 Type of application
Table 1 — Type of application
Examples for
Grinding Type of Superabrasive
Type of machine Workpiece application/
method application product
machines
Surface grinding,
centreless
grinding, creep
mechanically feed grinding,
fixéd
guided bevel grinding on
stationary
mechanically
glass (glass
grinding grinding
guided grinding
bevelling
machines
machine)
Profilé grinding
mechanically
fixéd of stone and
guided
concrete
Examples for
Grinding Type of Superabrasive
Type of machine Workpiece application/
method application product
machines
Internal grinding,
external, plunge
and traverse
grinding, jig
grinding,
mechanically mechanically
decorative stone
guided guided
milling and
polishing, pencil
edging of glass
(automotive
glass)
Roughing and
polishing of stone
manually guided fixéd floors (carriagé/
floor grinding
stationary and
machine)
manually guided
mobile grinding
grinding
Tool grinding
machines
(bench grinding
fixéd manually guided machine),
decorative glass
grinding
Stone and
hand-held concrete milling
hand-held
grinding manually guided fixéd and polishing
grinding
machines (angle/straight
grinder)
Cutting-off of
mechanically
fixéd bricks and tiles
guided
(table saw)
Cutting-off of
stationary mechanically stone and
cutting-off guided cutting- mechanically concrete (bridge-
fixéd
machines off guided type saw, floor
and wall saw,
wire saw)
mechanically mechanically Cutting-off of
guided guided semi-conductors
cutting-off
Cutting-off of
stone and
manually guided fixéd
stationary and
concrete (table
manually guided
mobile cutting-
saw, floor saw)
cutting-off
off machines
Cutting-off of
fixéd manually guided
bricks (table saw)
Cutting-off of
stone and
hand-held
hand-held concrete (angle
cutting-off manually guided fixéd
cutting-off grinder, hand-
machines
held cutting-off
machine)
3.4.1
mechanically guided grinding and cutting-off
process with feed movements of the abrasive product and/or workpiece guided by mechanical means
Note 1 to entry: See Table 1 .
3.4.2
manually guided grinding and cutting-off
process with feed movements of the abrasive product and/or the workpiece manually guided by the
operator
Note 1 to entry: See Table 1 .
3.4.3
hand-held grinding and cutting-off
process with the machine entirely guided by the operator
Note 1 to entry: See Table 1 .
3.5 Symbols
For the purposes of this document, the symbols listed in Table 2 and Table 3 apply.
Table 2 — Symbols
Symbol Designation Definition Unit
Bursting speed divided by
maximum operating
fbr burst speed factor —
speed:
Revolutions per minute at
which the spindle of
défléction speed of
nab mounted points is 1/min
mounted points
déflécting under
centrifugal force
Revolutions per minute of
maximum permissible
nmax a new abrasive product at 1/min
speed of rotation
maximum operating speed
Défléction speed divided
safety factor against
by maximum permissible
Sab spindle défléction for —
speed of rotation:
mounted points
Bursting speed divided by
safety factor against
maximum operating speed,
Sbr bursting due to centrifugal —
all squared:
force
Maximum permissible
vs maximum operating speedperipheral speed of a m/s
rotating abrasive product
Peripheral speed at which
vbr bursting speed an abrasive product breaks m/s
due to centrifugal force
Peripheral speed which an
abrasive product at least
vbr,min minimum bursting speed m/s
reaches without bursting
due to centrifugal force
Table 3 — Other symbols
Symbol Designation Unit
F force N
FA shearing force N
LF lever arm mm
Mb bending moment Nm
σb bending strength
N/mm
τS shear strength
N/mm
4 List of significant hazards
The significant hazards are listed in Table 4.
Table 4 — List of significant hazards
Hazard designation Hazardous situations Relevant clauses in this standard
(Examples)
Ejection of parts 1. Abrasive product breakage —
caused by:
— improper design 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, Annex B
and Annex C
— manufacturing defects 5.1
— wrong selection Clause 7, Annex A
— improper handling and storage Clause 7
— improper use (mounting and Clause 7
grinding process)
2. Grinding debris Clause 7
Vibration Hand arm vibration on hand-held —
machines caused by:
— improper use Clause 7
— incorrect mounting Clause 7
Kickback Kickback effect of cutting-off —
wheels on hand-held machines
caused by:
— improper use Clause 7
— wobbling of cutting-off wheels 5.3.7
due to wrong tensioning
— side coating of cutting-off wheels 5.3.8
5 Safety requirements
5.1 General requirements
Superabrasive products shall be designed and manufactured in such a way that they resist the forces
and loads that are to be expected when used as intended. They shall not present visible defects affecting
safety and shall comply with the requirements listed in the following clauses.
5.2 Requirements for precision superabrasive grinding and cutting-off wheels
5.2.1 Bore tolerances
The tolerance class for bores on precision superabrasive grinding and cutting-off wheels is given in ISO
22917 [6].
5.2.2 Sequence of maximum operating speeds
Precision superabrasive grinding and cutting-off wheels shall be manufactured for maximum operating
speeds according to the following sequence:
< 16 — 20 — 25 — 32 — 35 — 40 — 45 — 50 — 63 — 80 — 100 — 125 — 140 — 160 — 180 — 200
— 225 — 250 — 280 — 320 in m/s.
Intermediate maximum operating speeds should only be used where the application requirements
demand it.
NOTE For conversion of peripheral speeds into speeds of rotation for different outside diameters D of the
abrasive product, see Annex D.
5.2.3 Safety factors
Precision superabrasive grinding and cutting-off wheels shall have a safety factor against bursting due
to centrifugal forces at their maximum operating speed as given in Table 5.
Table 5 — Safety factors for precision superabrasive grinding and cutting-off wheels
Maximum
Type of machine Type of application Safety factor Burst speed factor
operating speed
vs Sbr fbr
m/s
mechanically guided
grinding and cutting- ≤ 80 3,0 1,73
off
mechanically guided
stationary machines
grinding and cutting-
off with totally ≤ 320 1,75 1,32
enclosed working
area
manually guided ≤ 63 3,0 1,73
stationary and
grinding and cutting-
mobile machines
80 3,5 1,87
off
5.2.4 Maximum operating speeds
Precision superabrasive grinding and cutting-off wheels shall comply with the classification of the
sequence of maximum operating speeds in 5.2.2 up to the maximum values given in Table 6.
In the totally enclosed working area, the maximum operating speeds given in Table 6 may be exceeded,
if the safety factor required in Table 5 is complied with.
Table 6 — Maximum operating speeds as a function of the bond type
Maximum operating speed
vs
m/s
Abrasive
Core
Single layer:
section
electroplated
Vitrified Resinoid Metal
and vacuum
brazed
V B M
G
Manufactured on
core, e.g. sintered — 100 100 200
or electroplated
Connected to
Metal
core, e.g.
cemented,
180 80 100 —
screwed,
clamped, brazed
or welded
Manufactured on
— 100 — —
core, e.g. pressed
Connected to
Resinoid
core, e.g.
cemented, 80 80 80 80
screwed,
clamped
Manufactured on
80 — — —
core, e.g. pressed
Connected to
Vitrifiéd
core, e.g.
cemented, 80 80 80 —
screwed,
clamped
5.2.5 Blotters
Blotters shall be supplied by the manufacturer, supplier or importer where these are required for a safe
mounting and use of the superabrasive product.
Blotters shall be made of suitable compressible material. Shape, dimensions and material shall be
adapted to application and intended use. When water-based coolants are used the blotter material shall
not be affected in the way that it loses its compressibility and physical function.
Blotters can serve as a label for the marking provided the marking requirements of this standard are
met and the blotter is firmly attached to the wheel.
5.3 Requirements for non-precision cutting-off wheels
5.3.1 Bore tolerances
The tolerance class for bores for non-precision cutting-off wheels shall be H9 as per
EN ISO 286-2:2010.
5.3.2 Sequence of maximum operating speeds
Non-precision cutting-off wheels shall be manufactured for maximum operating speeds conforming to
the following sequence:
20 — 25 — 32 — 35 — 40 — 45 — 50 — 63 — 80 — 100 in m/s.
Intermediate maximum operating speeds should only be used where the application requirements
demand it.
NOTE For conversion of peripheral speeds into speeds of rotation for different outside diameters D of the
abrasive product, see Annex D.
5.3.3 Safety factors
Non-precision cutting-off wheels shall have a safety factor against bursting due to centrifugal forces at
their maximum operating speed as given in Table 7.
Table 7 — Safety factors for non-precision cutting-off wheels
Maximum Safety factor Burst speed factor
operating speed
Type of machine Type of application
v S f
s br br
m/s
mechanically guided
≤ 100 2,0 1,41
cutting-off
stationary
mechanically guided
cutting‑off machines
cutting-off with
≤ 100 1,75 1,32
totally enclosed
working area
stationary and
manually guided
mobile cutting-off ≤ 100 3,5 1,87
cutting-off
machines
hand-held cutting‑off
hand-held cutting‑off ≤ 100 3,5 1,87
machines
5.3.4 Maximum operating speeds
Non-precision cutting-off wheels shall comply with the sequence of maximum operating speeds in 5.3.2
up to the maximum values given in Table 8.
Table 8 — Maximum operating speeds as a function of the bond type
Maximum operating speed
v m/s
s
Cutting rim (abrasive
Single layer:
Type of application
section)
Metal electroplated and
vacuum brazed
M
G
mechanically and manually
continuous 100 100
guided cutting-off
mechanically and manually
segmented 100 100
guided cutting-off
continuous or segmented hand-held cutting-off 100 100
5.3.5 Requirements for the blank
5.3.5.1 Requirements for the blank of cutting-off wheels for dry cutting-off
5.3.5.1.1 Dimensions
Dimensions of blanks of non-precision cutting-off wheels for dry cutting-off, see Table 9.
Table 9 — Dimensions of blanks for dry cutting-off
Outside diameter of the blank Blank thickness
Type of machine
D E
mm mm
D ≤ 115 ≥ 0,7
Hand-held cutting-off machines 115 < D ≤ 200 ≥ 0,9
200 < D ≤ 230 ≥ 1,2
230 < D ≤ 300 ≥ 1,2
Hand-held and stationary cutting-
off machines
300 < D ≤ 400
≥ 1,6
350 < D ≤ 400 ≥ 1,6
400 < D ≤ 500 ≥ 2,0
Stationary and mobile cutting-off
500 < D ≤ 600 ≥ 2,5
machines
600 < D ≤ 900 ≥ 3,0
900 < D ≤ 1 600 ≥ 3,5
5.3.5.1.2 Material and hardness of blanks for laser welded cutting-off wheels
The material used for the blank shall be steel which shall have the necessary properties enabling it to
produce adequate joint strength when welding it to the segments. For example, alloyed cold worked
steels having a maximum carbon content of 0,27 % are suitable.
Blanks shall have a minimum hardness of 20 HRC for outside diameter D ≤ 230 mm and a minimum
hardness of 24 HRC for outside diameter D > 230 mm.
5.3.5.1.3 Material and hardness of blanks for sintered and direct melted cutting-off wheels
The material used for the blank shall be tool steel.
5.3.5.1.4 Surface finish of the entire slot area
Cutting-off wheels shall be manufactured in such a way that the surface finish in the area of the slots
does not cause crack formation.
5.3.5.1.5 Other requirements
Blanks shall be free from visible defects.
5.3.5.2 Requirements for the blank of cutting-off wheels for wet cutting-off
5.3.5.2.1 Dimensions
Dimensions of blanks for non-precision cutting-off wheels for wet cutting-off, see Table 10.
Table 10 — Dimensions of blanks for wet cutting-off
Outside diameter of the blank Blank thickness
Type of machine
D E
mm mm
D ≤ 300 ≥ 1,2
300 < D ≤ 400 ≥ 1,6
400 < D ≤ 500 ≥ 2,0
500 < D ≤ 600 ≥ 2,5
stationary and mobile cutting-off
machines
600 < D ≤ 900 ≥ 2,8
900 < D ≤ 2 500 ≥ 3,5
2 500 < D ≤ 3 500 ≥ 7,0
3 500 < D ≤ 5 000 ≥ 9,0
D ≤ 230 ≥ 0,006 D
1 1
hand-held cutting-off machines
230 < D ≤ 400 ≥ 0,005 D
1 1
5.3.5.2.2 Material
The material used for the blank shall be tool steel.
5.3.5.2.3 Surface finish of the entire slot area
See 5.3.5.1.4.
5.3.5.2.4 Other requirements
See 5.3.5.1.5.
5.3.5.3 Design and position of openings in the blank of cutting-off wheels for hand-held
applications
5.3.5.3.1 General
A distinction is made between different types of openings in the blank regarding crack propagation. The
different types are:
a) Cuts: A cut is an opening with a width of less than 0,8 mm;
b) Circular and elliptical openings with a ratio of large to small radius ≤ (2:1);
c) “Other openings”: All openings other than types 1) and 2).
Circular and elliptical openings minimize crack propagation whereas “other openings” and cuts might
support it due to a higher notch effect (stress concentration). Therefore, circular and elliptical openings
are treated in a different way compared to “other openings” and cuts.
Openings in blanks of cutting-off wheels for hand-held applications designed for any reasons such as
noise dampening shall comply with the following limitations:
a) The total area of openings in blanks excluding the bore shall be ≤ 20 % of the area of the blank;
b) Openings outside the flangé area shall end at a distance x ≥ 0,25 D/2 outside of the diameter of the
bore, where D is the outside diameter of the cut-off wheel. See also Figure 1;
c) Openings outside the flangé area other than circular and elliptical openings shall end at a distance of
≥ 15 % of the blank radius D /2 away from the closest slot or outside diameter of the blank. See also
Figure 1;
d) Inside the flangé area no openings other than drive pin holes or holes for fixing of functional elements
are allowed. No more than 2 drive pin holes and 8 fixing holes are allowed. Maximum hole diameter for
fixing holes is 8 mm. See also Figure 1.
Peripheral slots with or without holes at their ends and the bore shall not be considered as openings
according to this subclause.
Key
restricted area, see limitations b) and c) above
D outside diameter
D outside diameter of the blank
Figure 1 — Position of openings in blanks
5.3.5.3.2 Dimensions and distribution of cuts
a) Cuts outside the flangé area shall have a dimension in radial direction of ≤ 40 % of the blank radius
D /2.
b) The minimum distance between cuts outside the flangé area at any point of the cut shall be ≥ 15 %
of the radius D/2 of the cutting-off wheel.
c) Cuts shall start and end with a spiral.
5.3.5.3.3 Dimensions and distribution of “other openings”
“Other openings” in blanks shall have a dimension in radial direction of ≤ 15 % of the radius D/2 of the
cutting-off wheel with an opening angle of 15° at maximum, see Figure 2 as an example.
Key
1 flangé area
Figure 2 — Example of “other openings”
5.3.5.4 Heat treatment of all blanks
If slots or openings are produced by laser cutting, the blank shall be annealed if the micro hardness is
> 500 HV in the heat affected zone, in order to achieve a hardness of ≤ 500 HV.
5.3.6 Requirements for the connection of the superabrasive section to the blank
5.3.6.1 Connection of segments to the blank
The segments for hand-held cutting-off wheels for dry cutting-off shall be connected to the blank by
welding, sintering, direct melting or infiltration attachment processes.
5.3.6.2 Tolerances and bending moment for segmented non-precision cutting-off wheels
For segmented non-precision cutting-off wheels for the use on hand-held cutting-off machines, the ratio
of segment height to thickness of the blank, X /E shall be ≤ 8,5.
For segmented non-precision cutting-off wheels the strength of the joint between the blank and the
segment or the strength of the segment itself shall be designed to comply with the following bending
moment M :
b
L ⋅E ⋅σ
v b
(1)
M =
b
where
M is the bending moment, expressed in Nm;
b
L is the length of the bond interface between segment and blank, expressed in m;
v
E is the thickness of the blank, expressed in mm;
σ is the bending strength value, expressed in N/mm².
b
The bending strength values to be included in Formula (1) are:
a) for cutting-off wheels for the use on stationary and mobile cutting-off machines: σ = 450 N/mm , and
b
b) for cutting-off wheels for the use on hand-held cutting-off machines σ according to Table 11. Both
b
values for the minimum bending strength and minimum bending moment shall be achieved.
Table 11
Blank thickness Minimum bending moment Minimum bending strength
E M σ
b b
mm Nm
N/mm
≤ 1,5 6 700
1,5 < E < 2 8 650
≥ 2 10 600
5.3.6.3 Bending moments for cutting-off wheels with continuous cutting rim in metal bond
For non-precision cutting-off wheels with continuous rim, the strength of the joint between the metal
bond and the blank or within the abrasive layer shall be designed to comply with the following minimum
bending moments M (see Table 12).
b
Table 12 — Minimum bending moments
Blank Thickness E Minimum bending moment M
b
mm
Nm
≤ 1,2 5
1,2 < E ≤ 1,6 6
1,6 < E < 2,0 8
≥ 2,0 10
5.3.6.4 Requirements for reconditioned non-precision cutting-off wheels
Segmented cutting-off wheels which have been equipped with new abrasive sections due to wear of the
abrasive sections shall comply with the same requirements as unused cutting-off wheels.
They shall comply with the marking requirements in Annex A and in addition carry the data for marking
the reconditioned state given in Clause C.2.
Reconditioning is only permitted, if the preconditions in Clause C.1 are complied with.
5.3.7 Tensioning of non-precision cutting-off wheels
All non-precision cutting-off wheels, marked with maximum operating speed of 100 m/s for hand-held
cutting-off machines and blank diameter in the range of 260 mm to 400 mm shall be in a tensioned state
in order to minimize the risk of wobbling (excessive vibration).
The exact position of the neutral point depends on blank type and blank thickness and shall have a value
in the range of 90° to 160° from position (B) (Figure 12) in order to have a correct tensioning of the
non-precision cutting-off wheel.
5.3.8 Limitation of side coating of abrasive grain and/or superabrasive grain
Side coating of abrasive grain and/or superabrasive grain is only allowed at the periphery of the blank
within a limit ≤ 0,05 D (see Figure 3) for all non-precision cutting-off wheels marked with maximum
operating speed of 100 m/s for hand-held cutting-off machines and blank diameter in the range of 260
mm to 400 mm.
Key
D outside diameter
Figure 3 — Limitation of side coating (≤ 0,05 D)
5.4 Requirements for diamond wires
5.4.1 General
Wires with diamond or materials with comparable properties are used on wire sawing machines for
sawing (cutting-off) of natural stone, industrial ceramics, concrete and other materials. Diamond wires
shall not be used on hand-held machines.
5.4.2 Requirements
5.4.2.1 Requirements for the support cable
Support cables for diamond wire are subject to frequent breakage due to mechanical stress or wire
fatigue, depending on their construction, type of application and their operating conditions. Therefore,
a cable shall be selected which has proven fatigue resistance, e.g. preferably a multi-strand cable made
of finé multiple wires, for example: 6 × 7 on a 19 wire core.
Support cables shall have a minimum tensile strength of 800 N/mm in relation to the wire diameter.
5.4.2.2 Requirements for spring mounted diamond wire
For diamond wires where the abrasive beads are held by means of springs, press rings and spacer rings,
the bore diameters of the abrasive beads shall have the following limit deviations:
a) for the new diamond wire: bore of the abrasive beads by 0,4 mm greater than the wire diameter;
b) for the used diamond wire: bore of the abrasive beads by 0,6 mm greater than the wire diameter.
A maximum of 5 abrasive beads shall be mounted between two press rings.
After mounting on the support cable, the support cable and the press rings shall not show any sign of
breakage.
The spring ends shall be close-coiled and ground at each end.
5.4.2.3 Requirements for plastic and vulcanised rubber mounted diamond wires
All abrasive beads shall be mounted on the support cable by means of plastic or vulcanized rubber.
5.4.2.4 Requirements for wire couplings and press rings
The wire couplings shall be capable of withstanding at least 30 % of the load capacity of the support cable.
The press rings shall be capable of withstanding 1/12 the load capacity of the support cable without
moving.
5.4.3 Maximum operating speeds
The maximum operating speed for diamond wires shall not exceed v = 40 m/s.
s
5.5 Requirements for mounted points
5.5.1 Spindle diameter tolerances
The tolerance class for spindle diameters for mounted points is given in ISO 22917 [6].
5.5.2 Sequence of maximum operating speeds
Mounted points shall be manufactured for maximum operating speeds conforming to the following
sequence:
5 — 6 — 8 — 10 — 12 — 16 — 20 — 25 — 32 — 35 — 40 — 45 — 50 — 63 in m/s
NOTE For conversion of peripheral speeds into speeds of rotation for different outside diameters D of the
abrasive product, see Annex D.
5.5.3 Safety factors
Mounted points shall have a safety factor against bursting due to centrifugal forces of S = 3. The spindle
br
shall have a safety factor against défléction of S = 1,3. Further requirements see Annex B.
ab
5.6 Requirements for other superabrasive products for non-precision grinding
5.6.1 Bore diameter tolerances
The tolerance class for bores for other superabrasive products for non-precision grinding is H9 for bore
sizes H ≤ 80 mm and H7 for bore sizes H > 80 mm.
5.6.2 Sequence of maximum operating speeds
Other superabrasive products for non-precision grinding shall be manufactured for maximum operating
speeds conforming to the following sequence:
40 — 45 — 50 — 63 — 80 — 100 in m/s
NOTE D of the abrasive product, see Annex D. For conversion of peripheral speeds into speeds of rotation for
different outside diameters
5.6.3 Safety factors
Other superabrasive products for non-precision grinding shall have a safety factor against bursting due
to centrifugal forces at their maximum operating speed as given in Table 13.
Table 13 — Safety factors for other superabrasive products for non-precision grinding
Maximum
operating speed
Safety factor Burst speed factor
Type of machine Type of application
v
s
S f
br br
m/s
mechanically guided
≤ 100 3,0 1,73
grinding
stationary grinding
machines
manually guided
80 3,5 1,87
grinding
≤ 50 3,0 1,73
hand-held grinding
hand-held grinding
machines
50 < v ≤ 80
3,5 1,87
s
5.6.4 Maximum operating speeds
Other superabrasive products for non-precision grinding shall comply with the sequence of maximum
operating speeds given in 5.6.2 up to the maximum values given in Table 14.
Table 14 — Maximum operating speeds as a function of the bond type
Maximum operating speed
vs
Abrasive product Type of application
m/s
Metal Electroplated
M G
cup grinding wheel hand-held grinding 80 80
profilé grinding wheel and mechanically guided
other superabrasive grinding
80 80
products for peripheral
a hand-held grinding
grinding
abrasive ring and other
mechanically guided
superabrasive products for 100 –
grinding
face grinding
a
Including cutting-off wheels with D < 400 mm and thickness of blank E ≥ 4 mm.
5.6.5 Requirements for the connection of the abrasive section to the core
5.6.5.1 For segmented cup grinding wheels for use on hand-held machines, the strength of the joint
between the core and the abrasive section shall be designed to comply with one of the following
requirements:
a) shear strength τ ≥ 60 N/mm or
S
b) shearing force F ≥ 6 400 N.
A
5.6.5.2 For all other superabrasive products for non-precision grinding which are segmented the
strength of the joint between the core and the abrasive section shall be designed to comply with the
requirements on the bending moments according to 5.3.6.2.
If the design does not allow applying a bending moment the requirements on the shear strength or the
shearing force, respectively, according to 5.6.5.1 shall be met.
5.7 Marking
Superabrasive products shall be marked according to Annex A.
6 Verification of the safety requirements
6.1 Verification of the general requirements
6.1.1 General
Superabrasive products shall be tested at a level sufficiént to confirm consistent conformance to the
requirements of the standard.
6.1.2 Visual inspection
For visible defects affecting safety the superabrasive product shall be checked by visual inspection. For
plastic or vulcanised rubber mounted diamond wires, the saws shall be inspected for loose abrasive
beads. Damaged superabrasive products shall be destroyed.
6.1.3 Ring test
The ring test shall be performed on all superabrasive grinding wheels with vitrifiéd
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