Bsi bs en 13236 2010 + a1 2015

BS EN 13236:2010+A1:2015
BS EN 13236:2010

BSI Standards Publication

Safety requirements for
superabrasive products


BS EN 13236:2010+A1:2015

BRITISH STANDARD
National foreword
This British Standard is the UK implementation of
EN 13236:2010+A1:2015. It supersedes BS EN 13236:2010 which is
withdrawn.
The start and finish of text introduced or altered by amendment is
indicated in the text by tags. Tags indicating changes to CEN text carry
the number of the CEN amendment. For example, text altered by CEN
amendment A1 is indicated by .
The UK participation in its preparation was entrusted to Technical
Committee MTE/13, Grinding wheels, abrasive tools, paper and cloths,
and powders.
A list of organizations represented on this committee can be obtained
on request to its secretary.
This publication does not purport to include all the necessary provisions
of a contract. Users are responsible for its correct application.
© The British Standards Institution 2016.
Published by BSI Standards Limited 2016
ISBN 978 0 580 90463 9
ICS 25.100.70

Compliance with a British Standard cannot confer immunity from
legal obligations.
This British Standard was published under the authority of the Standards
Policy and Strategy Committee on 31 December 2010.

Amendments/corrigenda issued since publication
Date

Text affected

31 January 2016Implementation of CEN amendment A1:2015


EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
ICS 25.100.70

EN 13236:2010+A1
December 2015

Supersedes EN 13236:2010

English Version

Safety requirements for superabrasive products

Prescriptions de sécurité pour les produits
superabrasifs

Sicherheitsanforderungen für Schleifwerkzeuge mit
Diamant oder Bornitrid

This European Standard was approved by CEN on 16 October 2010 and includes Amendment 1 approved by CEN on 17
November 2015.

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
worldwide for CEN national Members.

Ref. No. EN 13236:2010+A1:2015 E


BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

Contents

Page

European foreword................................................................................................................................................................ 5
Introduction ............................................................................................................................................................................. 7
1

Scope ............................................................................................................................................................................. 8

2

Normative references ............................................................................................................................................. 8

3
3.1
3.2
3.3
3.4
3.5
3.6

Terms, definitions and symbols .......................................................................................................................... 8
General ......................................................................................................................................................................... 8
Grinding machines ................................................................................................................................................... 8
Grinding method ...................................................................................................................................................... 9
Type of application .................................................................................................................................................. 9
Symbols ..................................................................................................................................................................... 11
Other symbols ........................................................................................................................................................ 11

4

List of significant hazards .................................................................................................................................. 12

5
5.1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8

5.4
5.4.1
5.4.2
5.4.3
5.5
5.5.1
5.5.2
5.5.3
5.6
5.6.1
5.6.2
5.6.3
5.6.4
5.6.5
5.7

Safety requirements ............................................................................................................................................. 12
General requirements ......................................................................................................................................... 12
Requirements for precision superabrasive grinding and cutting-off wheels ................................. 13
Bore tolerances ...................................................................................................................................................... 13
Sequence of maximum operating speeds ..................................................................................................... 13
Safety factors........................................................................................................................................................... 13
Maximum operating speeds .............................................................................................................................. 13
Blotters ..................................................................................................................................................................... 14
Requirements for non-precision cutting-off wheels ................................................................................ 14
Bore tolerances ...................................................................................................................................................... 14
Sequence of maximum operating speeds ..................................................................................................... 14
Safety factors........................................................................................................................................................... 15
Maximum operating speeds .............................................................................................................................. 15
Requirements for the metal blank .................................................................................................................. 16

Requirements for the connection of the superabrasive section to the metal blank..................... 19
Tensioning of non-precision cutting-off wheels ........................................................................................ 21
Limitation of sides abrasives and/or superabrasives coating ............................................................. 21
Requirements for diamond wires ................................................................................................................... 21
General ...................................................................................................................................................................... 21
Requirements ......................................................................................................................................................... 21
Maximum operating speeds .............................................................................................................................. 22
Requirements for mounted points ................................................................................................................. 22
Spindle diameter tolerances ............................................................................................................................. 22
Sequence of maximum operating speeds ..................................................................................................... 22
Safety factors........................................................................................................................................................... 22
Requirements for other superabrasive products for non-precision grinding ............................... 22
Bore diameter tolerances .................................................................................................................................. 22
Sequence of maximum operating speeds ..................................................................................................... 22
Safety factors........................................................................................................................................................... 22
Maximum operating speeds .............................................................................................................................. 23
Requirements for the connection of the abrasive section to the core ............................................... 23
Marking ..................................................................................................................................................................... 24

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EN
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EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

6
6.1

6.1.1
6.1.2
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.3
6.4
6.5

Verification of the safety requirements ........................................................................................................ 24
Verification of the general requirements ..................................................................................................... 24
Visual inspection.................................................................................................................................................... 24
Ring test .................................................................................................................................................................... 24
Verification of the strength requirements ................................................................................................... 24
Verification of the safety factor ........................................................................................................................ 24
Verification of the bending moment of non-precision cutting-off wheels ........................................ 24
Verification of the strength requirements for other superabrasive products for nonprecision grinding ................................................................................................................................................. 27
Verification methods for diamond wires ...................................................................................................... 28
Verification of marking ....................................................................................................................................... 30
Verification of the requirements for blotters.............................................................................................. 30
Verification of tensioning of non-precision cutting-off wheels ............................................................ 30

7

Information for use ............................................................................................................................................... 31

Annex A (normative) Marking ......................................................................................................................................... 32
A.1

Content of the marking ........................................................................................................................................ 32
A.1.1 Marking requirements......................................................................................................................................... 32
A.1.2 Additional inscriptions ........................................................................................................................................ 34
A.1.3 Multiple or gang mounted wheels ................................................................................................................... 34
A.2
Execution of the marking .................................................................................................................................... 35
Annex B (normative) Colour codes ................................................................................................................................ 36

Annex C (informative) Mounted points ........................................................................................................................ 37
C.1
Example of calculation of the maximum permissible speed of rotation ........................................... 37
C.2
Example for the application of the calculation method ........................................................................... 40
C.2.1 Types of mounted points .................................................................................................................................... 40
C.2.2 Assumptions for the calculation....................................................................................................................... 41
C.2.3 Maximum permissible speeds of rotation .................................................................................................... 42
Annex D (normative) Reconditioning of cutting-off wheels according to 5.3.6.4 ......................................... 44
D.1
Preconditions for reconditioning .................................................................................................................... 44
D.2
Additional marking requirements .................................................................................................................. 44
Annex E (informative) Speed conversion table.......................................................................................................... 46
Bibliography .......................................................................................................................................................................... 49
Figures
Figure 1 — Position of cuts and openings in steel blanks ..................................................................................... 18
Figure 2 — Example of cut-outs and openings .......................................................................................................... 19
Figure 3 — Segmented cutting-off wheels: Dimensions of segment height X1 ............................................... 25
Figure 4 — Example of a bending test device for segmented cutting-off wheels.......................................... 25
Figure 5 — Cutting-off wheels with continuous rim: Dimensions of segment height X1 ............................ 26
Figure 6 — Example of a bending test device for cutting-off wheels with continuous rim ....................... 27

Figure 7 — Example of a shearing force test device ................................................................................................ 28
Tables
Table 1 — Grinding method, type of machine, type of application .................................................................... 10

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13236:2010+A1:2015 (E)
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EN

Table 2 — Symbols .............................................................................................................................................................. 11
Table 3 — Other symbols.................................................................................................................................................. 12
Table 4 — List of significant hazards ........................................................................................................................... 12
Table 5 — Safety factors for precision superabrasive grinding and cutting-off wheels............................ 13
Table 6 — Maximum operating speeds as a function of the bond type ........................................................... 14
Table 7 — Safety factors for non-precision cutting-off wheels ........................................................................... 15
Table 8 — Maximum operating speeds as a function of the bond type ........................................................... 15
Table 9 — Dimensions of blanks for dry cutting-off ............................................................................................... 16
Table 10 — Dimensions of blanks for wet cutting-off ............................................................................................ 17
Table 11 — Bending strength σb for cutting-off wheels for the use on hand-held cutting-off
machines depending on segment height X1 and segment length L2 .................................................... 20
Table 12 — Minimum bending moment Mb ............................................................................................................... 20
Table 13 — Safety factors for other superabrasive products for non-precision grinding ....................... 23
Table 14 — Maximum operating speeds as a function of the bond type ......................................................... 23
Table A.1 — Marking of superabrasive products .................................................................................................... 32
Table A.2 — Restrictions of use (RE) ............................................................................................................................ 34
Table B.1 — Colour codes and design of colour codes ........................................................................................... 36

Table C.1 — Designation of the calculation quantities .......................................................................................... 39
Table C.2 — Designation of mounted points ............................................................................................................. 40
Table C.3 — Characteristics for the calculation of maximum speeds of rotation ........................................ 41
Table C.4 — Mounted points, cylindrical shape, plain spindles (ZYN) vitrified bond (V) ......................... 42
Table C.5 — Mounted points, cylindrical shape, reduced spindles (ZYA), vitrified bond (V).................. 42
Table C.6 — Mounted points, cylindrical shape, plain spindle Schaft (ZYN), electroplated bond
(G) ............................................................................................................................................................................... 43
Table E.1 — Speed conversion ........................................................................................................................................ 46

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BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

European foreword
This document (EN 13236:2010+A1:2015) has been prepared by Technical Committee CEN/TC 143
“Machine tools - Safety”, the secretariat of which is held by SNV.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2016 and conflicting national standards shall be withdrawn at
the latest by June 2016.

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.

The provisions of this European Standard need not be mandatory to superabrasive products manufactured
the first 12 months after publication of this European Standard.

This document includes Amendment 1 approved by CEN on 17 November 2015.
This document supersedes !EN 13236:2010".

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!Significant changes between EN 13236:2001 and EN 13236:2010 were as follows:"

a) the standard was technically and editorially revised and partly adapted to EN 12413:2007 about bonded
abrasive products and EN 13743:2009 about coated abrasive products;
b) the term "burst speed factor" was included in Table 2, Table 5, Table 7 and Table 13;

c) in the requirements it is now distinguished between precision and non-precision cutting-off wheels;

d) new 5.3.5.3 defines restrictions in design and position of cuts and openings in the metal blank of cuttingoff wheels for hand-held applications;

e) changed 5.3.6.2 on dimensional limitations and bending moment for segmented non-precision cuttingoff wheels for hand-held applications, with requirements now depending on segment height and
segment length;
f)

requirements for reconditioned non-precision cutting-off wheels were included in new 5.3.6.4 and new
normative Annex D;

g) Clause 6 was shortened to verification of safety requirements. The scope of inspection and testing has
been deleted because it is the responsibility of the manufacturer to put in place respective test
procedures that give them the confidence that all safety requirements defined in this standard are
respected;
h) the requirements for colour code stripes were deleted in Annex A and are now presented in new
Annex B;
i)
j)

Table A.3 and Table A.4 about restrictions for use were combined to one table and thereby adapted to
EN 12413 and EN 13743;

Clause A.2 about execution of the marking was simplified;

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EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

k) Annex B about blotters was deleted and part of its content was included in 5.2.5;
l)

Annex C about mounted points was completely revised and shortened;

m) Annex D with the speed conversion table (now Annex E) was editorially revised and maximum
operating speeds above 320 m/s were deleted;
n) Annex E about shapes and dimensions of grinding wheels and cutting-off wheels had become obsolete
with publication of ISO 6104 and was therefore deleted;
o) Annex F about grain sizes and concentration for diamond and cubic boron nitride had become obsolete
with publication of ISO 6106 and was therefore deleted.

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.

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BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

Introduction
This European Standard 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 European Standard 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 Safety Requirements of the Machinery Directive.
The extent to which hazards are covered is indicated in the scope of this European Standard.

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EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

1 Scope
!This European Standard only 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 European Standard specifies requirements and/or measures for the removal or reduction of hazards
resulting from the design and application of the superabrasive products.

This European Standard contains also procedures and tests for verification of the compliance with the
requirements as well as safety information for use which is to be made available to the user by the
manufacturer.
The hazards taken into consideration are listed in Clause 4.

This European Standard does not apply to bonded abrasive products, coated abrasive products, rotating
dressing tools, truers nor any non-rotating superabrasive products.

2 Normative references

!The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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)

ISO 22917, Superabrasives — Limit deviations and run-out tolerances for grinding wheels with diamond or
cubic boron nitride

3 Terms, definitions and symbols

For the purposes of this document the following terms and definitions apply.

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 machines

3.2.1
stationary grinding machine
grinding machine being fixed in position during operation
!Note 1 to entry:

"See for example EN 13218.

3.2.2
mobile grinding machine
grinding machine not being fixed in position during operation

!Note 1 to entry:
"Mobile grinding machines are manually guided (but not supported) by hand during use, e.g.
floor grinding machines.

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EN

(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

3.2.3
hand-held grinding machine
grinding machine being held in the hand during the grinding process

!Note 1 to entry:

"See for example EN 792-7, EN 792-9, EN 60745-2-3 and EN ISO 19432.

3.2.4
grinding machine with totally enclosed working area
stationary grinding machine being protected in such a way by separating guards 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

3.3 Grinding method

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
slotting with the periphery of the cutting-off wheel

3.4 Type of application
See Table 1.

3.4.1
mechanically guided grinding
grinding process with feed movements of the abrasive product and/or workpiece guided by mechanical
means
3.4.2
manually guided grinding
grinding process with feed movements of the abrasive product and/or the workpiece manually guided by
the operator
3.4.3
hand-held grinding
grinding process with grinding machine entirely guided by the operator's hands

9


10

Cutting-off

Grinding

Grinding method

Mechanically
guided cutting-off

Stationary
cutting-off
machines
Mechanically
guided

Mechanically
guided

Fixed

Manually guided

Fixed

Manually guided

Mechanically
guided

Mechanically
guided

Hand-held
cutting-off
machines

Manually guided

Stationary

and
Manually guided
Manually guided
mobile cutting-off
cutting-off
Fixed
machines

Hand-held
cutting-off

Hand-held
grinding

Hand-held
grinding machines

guided

Mechanically
guided grinding

Stationary
and
Manually
mobile
grinding
grinding
machines

Stationary
grinding machines

Fixed

Superabrasive
product

Cutting-off of bricks (table saw)

Manually guided
Fixed

Cutting-off of stone and concrete (angle grinder, handheld cutting-off machine)

Cutting-off of stone and concrete (table saw, floor saw)

Cutting-off of semi-conductors
Fixed

polishing

machine)

Cutting-off of stone and concrete (bridge-type saw, floor
and wall saw, wire saw)

Mechanically
guided

Fixed

and
Cutting-off of bricks and tiles (table saw)

milling

Mechanically
guided

Stone
and
concrete
(angle/straight grinder)

stone

grinding

Roughing
and
polishing
of
(carriage/floor grinding machine)

Tool
grinding
(bench
decorative glass grinding

Fixed

floors

grinding,
on glass

Internal grinding, external, plunge and traverse grinding,
jig grinding, decorative stone milling and polishing,
pencil edging of glass (automotive glass)

Profile grinding of stone and concrete

Surface
grinding,
centerless
creep feed grinding, bevel grinding
(glass bevelling machine)

Examples for application/machines

Manually guided

Fixed

Mechanically
guided

Fixed

Mechanically
guided

Workpiece

Table 1 — Grinding method, type of machine, type of application

Type of machine Type of application

BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN


BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

3.5 Symbols
The symbols used in this European Standard are listed in Table 2.
Table 2 — Symbols

Symbol
nab
nmax

Designation

Definition

Deflection speed of a mounted Revolutions per minute at
point
which the spindle of a rotating
mounted point is deflecting
under centrifugal force
Maximum permissible speed of Revolutions per minute of a
rotation
rotating new abrasive product
at maximum operating speed

Sab

Safety factor against spindle Deflection speed divided by
deflection for mounted points maximum permissible speed of
rotation:

vs

Maximum operating speed

vbr

Bursting speed

vbr min

fbr

Sbr

Sab

Minimum bursting speed

Burst speed factor

n
= ab
nmax

Unit
1/min
1/min
—

Maximum
permissible
peripheral speed of a rotating
abrasive product

m/s

Peripheral speed, which a
rotating abrasive product shall
at least reach without bursting
due to centrifugal force

m/s

Peripheral speed at which a
rotating abrasive product
breaks due to centrifugal force

Bursting speed divided by
maximum operating speed:

f br =

vbr
vs

Safety factor against bursting Bursting speed divided by
due to centrifugal force
maximum operating speed, all
squared:
v
S br =  br
 vs






2

m/s

—

—

3.6 Other symbols
Other symbols used in this European Standard are listed in Table 3.

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EN

Table 3 — Other symbols
Symbol
Mb

Bending moment

FA

Shearing force

F

LF

σb
τS

Designation

Unit
Nm

Force

N
N

Lever arm

mm

Bending strength

N/mm2

Shear strength

N/mm2

4 List of significant hazards
Table 4 — List of significant hazards
Hazard designation

Ejection of parts

Hazardous situations
(Examples)

Relevant clauses
in this standard

1. Abrasive product breakage
caused by:
— improper design

5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7,
Annex C and Annex D

— wrong selection

Clause 7, Annex A and Annex B

— manufacturing defects
— improper
storage

handling

5.1
and

Clause 7

— improper use (mounting and
Clause 7
grinding process)
Vibration

2. Grinding debris

Clause 7

— improper use

Clause 7

3. Hand arm vibration on handheld machines caused by:
— incorrect mounting

Clause 7

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.
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EN 13236:2010+A1:2015

13236:2010+A1:2015 (E)

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.
5.2.2 Sequence of maximum operating speeds

Precision superabrasive grinding and cutting-off wheels shall be manufactured for maximum operating
speeds conforming 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.
NOTE
For conversion of maximum operating speeds into speeds of rotation for different outside diameters D of
the abrasive product, see Annex E.

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

Type of machine

Type of application

Mechanically
guided grinding

Stationary grinding Mechanically

guided
grinding
machines
with
totally
enclosed working
area
Stationary
and
Manually
mobile
grinding
grinding
machines

guided

Maximum
operating speed
vs

Safety factor
Sbr

Burst speed factor
fbr

≤ 80

3,0

1,73

≤ 320

1,75

1,32

≤ 63

3,0

1,73

m/s

80

3,5

1,87

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.

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EN

Table 6 — Maximum operating speeds as a function of the bond type
Maximum operating speed vs
Abrasive section

Core

Metal

Resinoid

Vitrified

Vitrified
V

Resinoid
B

Connected
to
core,
e.g.

cemented,
screwed,
clamped, brazed or welded

—

m/s

Metal
M

Electroplated
G

100

100

200

180

80

100

—

Connected
to

core,
e.g.
cemented,
screwed,
clamped

—

100

—

—

80

80

80

80

Connected
to
core,
e. g. cemented, screwed,
clamped

80

—

—

—

80

80

80

—

Manufactured
on
core,
e.g. sintered or electroplated
Manufactured
e.g. pressed

on

Manufactured
e.g. pressed

on

core,

core,

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 is 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.

NOTE
For conversion of maximum operating speeds into speeds of rotation for different outside diameters D of
the abrasive product, see Annex E.

14

BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

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

Type of machine

Type of application

Mechanically
guided cutting-off

Stationary cutting- Mechanically
guided cutting-off
off machines
with
totally
enclosed working
area
Stationary
and
Manually
mobile
cutting-off

cutting-off
machines

guided

Hand-held cutting- Hand-held cuttingoff machines
off

Maximum
operating speed
vs

Safety factor
Sbr

Burst speed factor
fbr

≤ 100

2,0

1,41

≤ 100

1,75

1,32

≤ 100

3,5

1,87

m/s

≤ 100

3,5

1,87

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
Cutting rim
(abrasive
section)

Core

Metal blank,
rolled, forged

e.g.

cast,

continuous
segmented

Type of
application

Mechanically and manually
guided cutting-off
Mechanically and manually
guided cutting-off

continuous or
Hand-held cutting-off
segmented

Maximum operating speed
vs
m/s
Metal
M

Electroplated
G

100

100

100

100

100

100

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BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

5.3.5 Requirements for the metal blank
5.3.5.1 Requirements for the metal blank of cutting-off wheels for dry cutting-off
5.3.5.1.1 Dimensions
Dimensions of metal 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 D1 of the blank

Blank thickness E

mm

up to and including

mm

—

115

≥ 0,7

200

230

≥ 1,2

Type of machine
more than
Hand-held
machines
Hand-held
stationary
machines

cutting-off
and
cutting-off

Stationary and mobile
cutting-off machines

115

230
300
350
400
500
600
900

200
300
400
400
500
600
900

1 600

5.3.5.1.2 Material and hardness of blanks for laser welded cutting-off wheels

≥ 0,9
≥ 1,2
≥ 1,6
≥ 1,6
≥ 2,0
≥ 2,5
≥ 3,0
≥ 3,5

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 D1 ≤ 230 mm and a minimum
hardness of 24 HRC for outside diameter D1> 230 mm.
5.3.5.1.3 Material and hardness of blanks for sintered and direct melted cutting-off wheels
Tool steels, grade to the choice of the manufacturer.
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.

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BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

5.3.5.2 Requirements for the metal blank of cutting-off wheels for wet cutting-off
5.3.5.2.1 Dimensions
Dimensions of metal 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 D1 of the blank

Blank thickness E

mm

mm

Machine type

more than
—

300

≥ 1,2

400

500

≥ 2,0

300
Stationary cutting-off
machine

500
600

5.3.5.2.2 Material

400
600
900

900

2 500

3 500

5 000

2 500
Hand-held cutting-off
machine

up to and
including

—

230

3 500
230
400

≥ 1,6
≥ 2,5
≥ 2,8

≥ 3,5
≥ 7,0
≥ 9,0

≥ 0,006 D1
≥ 0,005 D1

Tool steels, grade to the choice of the manufacturer.
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 cuts and openings in the metal blank of cutting-off wheels for handheld applications
5.3.5.3.1 General
Cuts and openings in steel blanks of cutting-off wheels for hand-held applications designed for any reasons
such as noise dampening shall comply with the following limitations:
a) Cuts located outside the flange area with more or less radial orientation 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.

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BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

b) Cuts outside the flange area other than circular holes and elliptical holes with a ratio of large to small
radius ≤ (2:1) shall end at a distance of ≥ 15 % of the blank radius D1/2 away from the closest gullet or
outside diameter of the blank. See also Figure 1.

c)

Inside the flange area no cuts or holes other than one drive pin hole or two circular cuts with
approximately radial orientation for fixing of functional elements are allowed.

Key
no cuts allowed in this area

Figure 1 — Position of cuts and openings in steel blanks

5.3.5.3.2 Dimensions and distribution of narrow laser cuts
a) Cuts outside the flange area shall have a dimension in radial direction of ≤ 40 % of the blank radius D1/2.

b) The minimum distance between cuts outside the flange area at any point of the cut-out shall be ≥ 15 %
of the radius D/2 of the cutting-off wheel.
c) Laser cuts shall start and end with a spiral.

5.3.5.3.3 Dimensions and distribution of wide cut-outs and openings
a) Wide cut-outs and 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.

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BS EN 13236:2010+A1:2015

EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

Key
1 flange area

Figure 2 — Example of cut-outs and openings

b) The total area of wide cut-outs and openings in blanks shall be ≤ 20 % of the area of the blank.

5.3.5.4 Heat treatment of all metal blanks

If slots or openings are produced by laser cutting, the steel 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 metal blank
5.3.6.1 Connection of segments to the metal blank

The segments for hand-held cutting-off wheels for dry cutting-off shall be connected to the metal 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 core, X1/E shall be ≤ 8,5.

For segmented non-precision cutting-off wheels the strength of the joint between the metal blank and the
segment shall be designed to comply with the following bending moment:

Mb =

where

Mb
Lv
E

σb

Lv ⋅ E 2 ⋅ σ b
6

(1)

is the bending moment;

is the length of the bond interface between segment and core;
is the thickness of the core;

is the bending strength value, see a) and b) below.
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BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

The bending strength values to be included in Equation (1) are:

a) for cutting-off wheels for the use on stationary and mobile cutting-off machines: σb = 450 N/mm2, and
b) for cutting-off wheels for the use on hand-held cutting-off machines σb according to Table 11.

Table 11 — Bending strength σb for cutting-off wheels for the use on hand-held cutting-off machines
depending on segment height X1 and segment length L2
σb
N/mm²
≥ 600
≥ 750
≥ 900

L2
X1
≥2

1,5 to < 2

1,0 to < 1,5

If for cutting-off wheels for the use on hand-held cutting-off machines the bending moment values Mb
resulting from Equation (1) are smaller than the values given in Table 12 as a function of the core thickness
E of the cutting-off wheel, then the values given in Table 12 shall be fulfilled at minimum.
Table 12 — Minimum bending moment Mb
Core thickness E
mm
< 1,2

1,2 to < 1,4

≥ 1,4

Minimum
bending
moment Mb
Nm
6
8

10

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 shall be designed to comply with the following bending moment:
Mb = F × D/2

where
F

D

(2)

is the force, here: F = 125 N;

is the outside diameter of the cutting-off wheel, expressed in m.

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 D.2.
Reconditioning is only permitted, if the preconditions in D.1 are complied with.
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BS EN 13236:2010+A1:2015
EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

!
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 steel centre diameter 300 mm to 400 mm, shall be in a tensioned state in order to
minimize the risk of wobbling (excessive vibrations).

The position of neutral point shall be in an angle range between 90° to 160° in order to have a correct
tensioning of the non-precision cutting off wheel."
!

5.3.8 Limitation of sides abrasives and/or superabrasives coating
Side abrasives and/or superabrasives coating is only allowed at periphery of the steel centre within a limit
x ≤ 0,05 D (distance of 5%) of steel centre diameter for all non-precision cutting off wheels marked with
maximum operating speed of 100 m/s for hand held cutting-off machines and steel centre diameter 300 mm
to 400 mm."

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 fine multiple
wires, for example: 6 × 7 on a 19 wire core.

Support cables shall have a minimum tensile strength of 800 N/mm² 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 bead 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 springs 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.
21

BS EN 13236:2010+A1:2015
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)
(E)
EN

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 vs = 40 m/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.
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 maximum operating speeds into speeds of rotation for different outside diameters D of
the abrasive product, see Annex E.

5.5.3 Safety factors

Mounted points shall have a safety factor against bursting due to centrifugal forces of Sbr = 3. The spindle
shall have a safety factor against deflection of Sab = 1,3. Further requirements see Annex C.

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
For conversion of maximum operating speeds into speeds of rotation for different outside diameters D of
the abrasive product, see Annex E.

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.

22


BS EN 13236:2010+A1:2015

EN
(E)
EN 13236:2010+A1:2015
13236:2010+A1:2015 (E)

Table 13 — Safety factors for other superabrasive products for non-precision grinding

Type of machine

Type of application

Mechanically
Stationary grinding guided grinding
machines
Manually
guided
grinding
Hand-held grinding
Hand-held grinding
machines
5.6.4 Maximum operating speeds

Maximum
operating speed
vs

Safety factor
Sbr

Burst speed factor

fbr

≤ 100

3,0

1,73

≤ 50

3,0

1,73

m/s
80

3,5

50 < vs ≤ 80

1,87

3,5

1,87

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

Abrasive product

Dish grinding wheel

Maximum operating speed vs
m/s

Type of
application
Hand-held grinding

guided
Profile
grinding
wheel
and
other Mechanically
grinding
superabrasive products for peripheral
grindinga
Hand-held grinding
Abrasive ring and other superabrasive Mechanically
products for face grinding
grinding

a

guided

Including cutting-off wheels with D < 400 mm and thickness of metal blank E ≥ 4 mm.

Metal
M

Electroplated
G

80

80

100

–

80

80

5.6.5 Requirements for the connection of the abrasive section to the core
5.6.5.1
For segmented dish 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 to one of the following requirements:
a) Shear strength τS ≥ 60 N/mm2 or

b) shearing force FA ≥ 6 400 N.

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 to apply a bending moment the requirements on the shear strength or the
shearing force, respectively, according to 5.6.5.1 shall be met.
23