SIST EN 61029-2-4:2011
(Amendment)Safety of transportable motor-operated electric tools - Part 2-4: Particular requirements for bench grinders (IEC 61029-2-4:1993, modified + A1:2001, modified)
Safety of transportable motor-operated electric tools - Part 2-4: Particular requirements for bench grinders (IEC 61029-2-4:1993, modified + A1:2001, modified)
This International Standard applies to transportable bench grinders with a wheel diameter not exceeding 200 mm and a peripheral speed not exceeding 50 mis, as defined in 2.101.
Sicherheit transportabler motorbetriebener Elektrowerkzeuge - Teil 2-4: Besondere Anforderungen für Tischschleifmaschinen (IEC 61029-2-4:1993, modifiziert + A1:2001, modifiziert)
Sécurité des machines-outils électriques semi-fixes - Partie 2-4: Règles particulières pour les tourets à meuler (CEI 61029-2-4:1993, modifiée + A1:2001, modifiée)
S'applique aux tourets à meuler dont la meule a un diamètre maximal de 200 mm et une vitesse circonférentielle maximale de 50 m/s.
Varnost premičnih električnih orodij - 2-4. del: Posebne zahteve za namizne brusilnike (IEC 61029-2-4:1993, spremenjen + A1:2001, spremenjen)
Ta mednarodni standard velja za premične namizne brusilnike s premerom kolesa, ki ne presega 200 mm, in s periferno hitrostjo, ki ne presega 50 m/s, kot je določeno v 2.101.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61029-2-4:2011
01-april-2011
1DGRPHãþD
SIST EN 61029-2-4:2003
SIST EN 61029-2-4:2003/A1:2004
9DUQRVWSUHPLþQLKHOHNWULþQLKRURGLMGHO 3RVHEQH]DKWHYH]DQDPL]QH
EUXVLOQLNH ,(& VSUHPHQMHQ$ VSUHPHQMHQ
Safety of transportable motor-operated electric tools - Part 2-4: Particular requirements
for bench grinders (IEC 61029-2-4:1993, modified + A1:2001, modified)
Sicherheit transportabler motorbetriebener Elektrowerkzeuge - Teil 2-4: Besondere
Anforderungen für Tischschleifmaschinen (IEC 61029-2-4:1993, modifiziert + A1:2001,
modifiziert)
Sécurité des machines-outils électriques semi-fixes - Partie 2-4: Règles particulières
pour les tourets à meuler (CEI 61029-2-4:1993, modifiée + A1:2001, modifiée)
Ta slovenski standard je istoveten z: EN 61029-2-4:2011
ICS:
25.080.50 Brusilni in polirni stroji Grinding and polishing
machines
25.140.20 (OHNWULþQDRURGMD Electric tools
SIST EN 61029-2-4:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 61029-2-4:2011
---------------------- Page: 2 ----------------------
SIST EN 61029-2-4:2011
EUROPEAN STANDARD
EN 61029-2-4
NORME EUROPÉENNE
January 2011
EUROPÄISCHE NORM
ICS 25.140.20; 25.080.50 Supersedes EN 61029-2-4:2003 + corr. Apr.2003 + A1:2003
English version
Safety of transportable motor-operated electric tools -
Part 2-4: Particular requirements for bench grinders
(IEC 61029-2-4:1993, modified + A1:2001, modified)
Sécurité des machines-outils Sicherheit transportabler
électriques semi-fixes - motorbetriebener Elektrowerkzeuge -
Partie 2-4: Règles particulières pour les Teil 2-4: Besondere Anforderungen für
tourets à meuler Tischschleifmaschinen
(CEI 61029-2-4:1993, modifiée + (IEC 61029-2-4:1993, modifiziert +
A1:2001, modifiée) A1:2001, modifiziert)
This European Standard was approved by CENELEC on 2011-01-10. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia,
Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61029-2-4:2011 E
---------------------- Page: 3 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 2 –
Foreword
The text of the International Standard IEC 61029-2-4:1993 + A1:2001, prepared by
IEC TC 116, Safety of hand-held motor-operated electric tools, together with the common
modifications prepared by the Technical Committee CENELEC TC 116, Safety of motor-
operated electric tools, was submitted to the formal vote and was approved by CENELEC as
EN 61029-2-4 on 2011-01-10.
This document supersedes EN 61029-2-4:2003 + corrigendum April 2003 + A1:2003.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop) 2012-01-10
– latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2014-01-10
In this document, the common modifications to the International Standard are indicated by a
vertical line in the left margin of the text.
This European Standard is divided into two parts:
Part 1 General requirements which are common to most transportable electric motor operated
tools (for the purpose of this standard referred to simply as tools) which could come
within the scope of this standard;
Part 2 Requirements for particular types of tool which either supplement or modify the
requirements given in part 1 to account for the particular hazards and characteristics of
these specific tools.
This European Standard has been prepared under a mandate given to CENELEC by the
European Commission and the European Free Trade Association and covers essential
requirements of the Machinery Directive 2006/42/EC. See Annex ZZ.
Compliance with the relevant clauses of Part 1 together with this Part 2 provides one means of
conforming with the specified essential health and safety requirements of the Directive.
For noise and vibration this standard covers the requirements for their measurement, the
provision of information arising from these measurements and the provision of information
about the personal protective equipment required. Specific requirements for the reduction of
the risk arising from noise and vibration through the design of the tool are not given as this
reflects the current state of the art.
As with any standard, technical progress will be kept under review so that any developments
can be taken into account.
Warning: Other requirements and other EC Directives can be applicable to the products
falling within the scope of this standard.
Part 2-4 is to be used in conjunction with EN 61029-1:2009.
Part 2-4 supplements or modifies the corresponding clauses of EN 61029-1, so as to convert it
into the European Standard: Safety requirements for transportable bench grinders.
---------------------- Page: 4 ----------------------
SIST EN 61029-2-4:2011
– 3 – EN 61029-2-4:2011
Where a particular subclause of Part 1 is not mentioned in this Part 2-4, that subclause applies
as far as is reasonable. Where this Part 2-4 states "addition", "modification" or "replacement",
the relevant text of Part 1 is to be adapted accordingly.
Subclauses, tables and figures which are additional to those in Part 1 are numbered starting
from 101. Subclauses, tables and figures which are additional to those in IEC 61029-2-4 are
prefixed "Z".
NOTE In this European Standard the following print types are used:
- Requirements proper;
- Test specifications;
- Explanatory matter.
---------------------- Page: 5 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 4 –
Contents
1 Scope . 6
2 Terms and definitions . 6
3 General requirement . 7
4 General notes on tests . 7
5 Rating . 7
6 Classification . 7
7 Marking . 7
8 Protection against electric shock . 8
9 Starting . 8
10 Input and current . 8
11 Heating . 8
12 Leakage current . 8
13 Environmental requirements . 9
14 Protection against ingress of foreign bodies and moisture resistance . 9
15 Insulation resistance and electric strength . 9
16 Endurance . 9
17 Abnormal operation. 9
18 Stability and mechanical hazards . 9
19 Mechanical strength . 15
20 Construction . 15
21 Internal wiring . 15
22 Components . 15
23 Supply connection and external flexible cables and cords . 15
24 Terminals for external conductors . 15
25 Provision for earthing . 16
26 Screws and connections . 16
27 Creepage distances, clearances and distance through insulation . 16
28 Resistance to heat, fire and tracking . 16
29 Resistance to rusting . 16
30 Radiation . 16
Figures
Figure 101 – Bench grinder . 17
Figure 102 − Schema . 18
Figure 103 – Guard . 19
Figure 104 – Bench grinder equipped with straight-sided cup wheels . 20
Figure 105 − Bench grinder with inclinable work rest . 21
Figure 106 – Transparent screen . 21
Figure 107 – Combined bench grinder . 22
Figure 108 – Flange dimensions . 23
Figure 109 – Protection of the rotating shaft . 23
---------------------- Page: 6 ----------------------
SIST EN 61029-2-4:2011
– 5 – EN 61029-2-4:2011
Figure Z101 – Mechanical strength . 24
Figure Z102 – Guard for brush . 24
Tables
Table Z101 − Guard thickness for steel . 10
Table Z102 − Guard thickness for aluminium . 10
Table Z103 − Material specifications . 11
Table 101 – Flange dimensions (see Figure 108) . 13
Table Z104 − Test torque for flanges . 13
---------------------- Page: 7 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 6 –
Text of EN 61029-2-4
The text of this European Standard consists of the text of the International Standard
IEC 61029-2-4:1993 + A1:2001 with the following common modifications.
COMMON MODIFICATIONS
1 Scope
This clause of Part 1 is applicable except as follows:
1.1 Addition:
This standard applies to transportable bench grinders (see Figure 101) and combined bench
grinders (see Figure 107) with a wheel diameter and brush diameter not exceeding 200 mm, a
thickness not exceeding 30 mm and a peripheral speed not exceeding 50 m/s, as defined in
2.101 and 2.107.
The requirements for bonded abrasive products (wheel) are given in EN 12413. The
requirements for brushes are given in EN 1083-2.
Stationary grinding machines are covered by EN 13218.
Bench grinders where the wheel partly runs in a water reservoir are not considered as tools
with water supply.
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
2.21
normal load
the load to obtain rated input
2.101
bench grinder
tool designed to grind metal or similar materials by means of one or two rotating abrasive
wheels fixed on the tool spindle, the work piece being held by hand (see Figure 101)
2.102
accessory
device or piece other than a grinding wheel intended to be mounted on the bench grinder
spindle
2.103
tool spindle
motor spindle of the bench grinder or of the combined bench grinder which supports the brush
and/or grinding wheels and transports the rotation to them
2.104
guard for wheel
device which partially encloses the abrasive wheel in order to protect the user against
accidental contact with the wheel in normal use and against ejection of fragments of the wheel
in the protected area in case of breakage of the wheel
---------------------- Page: 8 ----------------------
SIST EN 61029-2-4:2011
– 7 – EN 61029-2-4:2011
2.105
flange assembly
means provided to clamp an abrasive wheel to the tool spindle
2.106
work rest
surface or device intended to support or guide the piece to be worked
2.107
combined bench grinder
tool designed to grind metal or similar materials or to clean, polish or deburr metal or similar
materials by means of an abrasive wheel and a brush fixed on opposite ends of the tool
spindle, and which is located in a proper workplace and where pieces are held by hand
3 General requirement
This clause of Part 1 is applicable.
4 General notes on tests
This clause of Part 1 is applicable.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable.
7 Marking
This clause of Part 1 is applicable except as follows:
7.1 Addition:
-1
– the rated no-load speed in …/min or min ;
– the minimum and maximum diameter D of the wheel to be used;
– indication of the direction of rotation of the grinding wheel;
– for combined bench grinders, the minimum and maximum diameter D of the brush to be
used;
– for combined bench grinders, a warning near to the brush spindle never to use a grinding
wheel on the brush side of the machine;
– a warning to wear safety glasses or the relevant symbol.
7.6 Addition:
The direction of rotation of the wheel shall be indicated on the tool by an arrow raised or sunk
or by any other means not less visible and indelible.
---------------------- Page: 9 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 8 –
7.13 Addition:
The handbook or information sheet shall include all the necessary information for safe working
with the bench grinder or combined bench grinder, such as method of operation, wheel and
brush changing, maintenance, assembly, transportation, etc.
The substance of the following instructions shall also be given:
– warning not to use damaged or misshapen wheels or brushes;
– instruction to use only grinding wheels and brushes which have a marked speed equal to or
greater than the speed marked on the nameplate of the tool;
– instruction to adjust the spark arrestor frequently so as to compensate for wear of the
wheel, keep the distance between the spark arrestor and the wheel as small as possible
and in any case not greater than 2 mm;
– instructions for the safe use, handling and storage of abrasive wheels and brushes;
– if the grinder is intended to be bolted down, an instruction requesting it to be secured to a
suitable work surface;
– for combined bench grinders, instruction to always keep the brush assembled on the
spindle in order to limit the risk of contact with the rotating spindle;
– details of the grinding wheel(s) recommended, the maximum thickness of the wheel and the
diameter of the hole in the wheel;
– for combined bench grinders, details of the brushes recommended, the maximum thickness
of the brush and the diameter of the hole in the brush;
– the maximum wear of the wheel allowed before replacement;
NOTE Sketches may be used to illustrate the modes of operation.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Starting
This clause of Part 1 is applicable.
10 Input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable.
12 Leakage current
This clause of Part 1 is applicable.
---------------------- Page: 10 ----------------------
SIST EN 61029-2-4:2011
– 9 – EN 61029-2-4:2011
13 Environmental requirements
This clause of Part 1 is applicable except as follows:
13.1 This subclause is not applicable.
13.2.4 Replacement of paragraphs 1 and 2:
Bench grinders and combined bench grinders are tested at no-load.
NOTE The most important sources of noise for bench grinders are the workpiece and the wheel or brush. As these
sources of noise cannot be influenced by the design of the tool, the noise is measured at no-load.
13.3 This subclause is not applicable.
14 Protection against ingress of foreign bodies and moisture resistance
This clause of Part 1 is applicable except as follows:
14.4 If the tool is constructed to IPX4 or above, this subclause is not applicable.
14.5 If the tool is constructed to IPX4 or above, this subclause is not applicable.
15 Insulation resistance and electric strength
This clause of Part 1 is applicable.
16 Endurance
This clause of Part 1 is applicable.
17 Abnormal operation
This clause of Part 1 is applicable.
18 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows:
18.1 Addition:
Bench grinders and combined bench grinders shall be equipped with an adequate guarding
system which cannot be removed without the aid of a tool.
The guarding system shall comply with the requirements of 18.1.101.
18.1.101 Guard for wheel
Bench grinders and combined bench grinders shall be equipped with guards which leave
uncovered only a portion of the wheel as allowed in 18.1.101.2 and indicated in Figure 103.
On straight-sided wheels the side guard shall cover the flanges and the end of the tool spindle.
---------------------- Page: 11 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 10 –
The guard shall be designed so that the tool cannot be fitted with a wheel greater than 1,07
times the maximum diameter marked on the tool.
18.1.101.1 Strength of guards
Guards for straight sided wheels shall either:
a) have a thickness as given in Table Z101 or Table Z102, provided the guard is made of
material in accordance with Table Z103; or
b) meet the requirements of 18.1.101.1.Z1.
Guards for cup wheels shall either:
a) have a thickness as given in Table Z101 or Table Z102, provided the guard is made of
material in accordance with Table Z103; or
b) if the bench grinder is also fitted with a straight sided wheel and that guard meets the
requirements of 18.1.101.1.Z1, be of the same material and thickness as the guard for the
straight sided wheel.
Table Z101 − Guard thickness for steel
Material Peripheral Wheel Wheel diameter in mm
speed thickness
(see
≤ 125 ≤ 200 ≤ 250
Table m/s mm
P J P J P J
Z103)
1, 2 & 3 32 50 1,5 1,5 2 1,5 3 2
1, 2 & 3 40 25 1,5 1,5 2 1,5 2,5 2
50 1,5 1,5 2 1,5 3,5 2
1, 2 & 3 50 25 1,5 1,5 2 1,5 3 2
50 2 1,5 3 2 4,5 3
Table Z102 − Guard thickness for aluminium
Material Peripheral Wheel Wheel diameter in mm
speed thickness
(See
≤ 125 ≤ 200 ≤ 250
Table
m/s mm
P J P J P J
Z103)
10 5,5 5 6,5 5 8 6
32 20 6 5 8 6 10 8
7 32 6,5 5 9 7 12 10
50 10 6 5 8,5 7 10,5 9
20 7 6 10 8 13 11
10 2,5 2,5 3,5 3,5 4 4
40 20 3 3 4 4 5 5
6 32 3,5 3,5 4,5 4,5 6 5
10 3 3 4 4 5 5
50 20 3,5 3,5 4,5 4,5 6 5
32 4 4 5 5 7 6
---------------------- Page: 12 ----------------------
SIST EN 61029-2-4:2011
– 11 – EN 61029-2-4:2011
Table Z103 − Material specifications
Reference No. Material ISO or EN Ultimate tensile Elastic Elongation
strength strength
2 2
N/mm N/mm %
1 Steel ISO 3574 270 140 28
EN 10130
2 Steel ISO 4997 300 220 18
ISO 6316
3 Steel ISO 1052 340 215 17
EN 10025-2
4 Steel ISO 3755 450 230 22
6 Aluminium ISO 6361 310 260 10
7 Aluminium ISO 3522 200 - 3
18.1.101.1.Z1 Strength test
The tool shall be assembled as for normal use, the guard shall be equipped with any
attachments for which it is designed.
The tool shall be fitted with a grinding wheel of the same dimensions as recommended for
normal use and shall be rotating at maximum speed. A projectile shall be made to impact the
wheel as close as possible to the flange so as to cause a complete breakage of the wheel, care
being taken that the projectile does not itself affect the outcome of the test (see Figure 102).
This test is dangerous and must only be carried out in a properly constructed and equipped test
facility. The test must be carried out in a fully protected enclosure which can contain all the
wheel fragments and other debris.
Compliance is checked by test and inspection. After the test the wheel guard shall remain
attached to the tool, remain effective and shall show no visible crack when examined by a
recognised method of crack detection. Minor deformations and superficial damage are
acceptable. Any fixing devices such as guard clamps, bolts etc. shall remain effective.
18.1.101.2 Openings in the guard
18.1.101.2.1 For straight-sided wheels the opening angle in the guard shall not exceed 65°
above the horizontal plane passing through the centre of the wheel.
Under this plane the opening height H shall be smaller than 0,2 D (see Figure 103) but in any
case the total opening angle shall not exceed 90°.
18.1.101.2.2 For straight-sided cup wheels the height of the opening in the guard shall not be
greater than 0,4 D above the horizontal plane passing through the axis of the wheel (see
Figure 104a)).
The opening in the guard H, below the horizontal plane passing through the axis of the wheel,
shall not be greater than 0,2 D (see Figure 104b)).
The width of the opening in the guard periphery shall not be more than is sufficient to allow the
use of the wheel until it is worn out.
---------------------- Page: 13 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 12 –
18.1.101.2.3 The side clearance between the wheel and the guard shall be as small as
possible.
Compliance with 18.1.101.2 is checked by inspection and measurement.
18.1.101.3 Spark arrestor
Bench grinders and combined bench grinders equipped with straight-sided wheels shall have a
spark arrestor to limit the ejection of sparks and pieces of wheel from the wheel guard.
The spark arrestor shall be situated at the upper part of the wheel guard in line with the
periphery of the wheel and cover all the width of the wheel guard.
The spark arrestor shall be adjustable to within 2 mm of the surface of the wheel for all
diameters of wheel from the maximum wheel diameter to the minimum in accordance with 7.1.
Compliance is checked by inspection.
18.1.101.4 Work rest
Bench grinders and combined bench grinders shall be equipped with work rests. This
requirement does not apply to the brush side of the combined bench grinder.
The work rest shall be adjustable to within 2 mm of the surface of the wheel for all diameters of
wheel from the maximum wheel diameter to the minimum recommended by the manufacturer.
The work rest shall be adjustable without the aid of a tool, shall cover at least the width of the
wheel guard and the fixings shall ensure a firm position of the rest.
When the bench grinder and/or the grinder side of the combined bench grinder is fitted with an
inclinable work rest, the inclination shall only be possible downwards and the tilting upwards of
the work rest shall be made impossible (Figure 105).
Compliance is checked by inspection.
18.1.101.Z1 Guard for brush
Combined bench grinders shall be equipped with guards at the brush side to prevent accidental
contact with the rotating brushes and hazards caused by ejected fragments of the brush and
sparks.
The guard shall cover an area of ≥ 180° of the periphery of the brush. The opening angle shall
not exceed 65° above the horizontal plane passing through the centre of the brush. The width
of the guard shall at least cover the length of the spindle. The guard may be open laterally, see
Figure Z102.
The guard shall be mounted so that the tool cannot be fitted with a brush greater than
1,07 times the maximum diameter marked on the tool.
Compliance is checked by inspection and measurement.
---------------------- Page: 14 ----------------------
SIST EN 61029-2-4:2011
– 13 – EN 61029-2-4:2011
18.1.102 Flange
18.1.102.1 Dimensional requirements
Table 101 gives minimal dimensions of flanges made from steel or other material of adequate
2
strength with a minimal tensile strength of 430 N/mm or from sintered powder metal with a
2
minimal tensile strength of 500 N/mm in relation to the diameter of the wheel or brush D.
Table 101 – Flange dimensions (see Figure 108)
D d r E F T
f
mm mm mm mm mm
mm
34 6 5 3,2 1,5
D ≤ 100
100 < D ≤ 125 42 8 6 3,2 1,5
52 9 10 5 1,5
125 < D ≤ 150
150 < D ≤ 200 68 12 10 5 1,5
Cast iron flanges shall not be used.
18.1.102.2 Torque test for flanges
Flanges which do not fulfil the minimal dimensions or the minimal tensile strength specified in
18.1.102.1 shall be checked by the following test.
The abrasive wheel shall be replaced by a steel disc having the same dimensions.
The clamping nut shall be tightened with a first test torque according to Table Z104. A feeler
gauge of thickness 0,05 mm shall be used to check whether the flanges are in contact with the
disc all around the circumference. It shall not be possible to push the feeler gauge between the
flange and the surface of the disc.
The clamping nut shall then be tightened to the second test torque according to Table Z104. It
shall not be possible to push the feeler gauge between the flange and the surface of the disc
by more than 1 mm at any point around the circumference of the flange.
Table Z104 − Test torque for flanges
Thread First test torque Second test torque
Metric UNC Nm Nm
8 2 8
10 3/8 4 15
12 ½ 7,5 30
14 11 45
16 5/8 17,5 70
¾ 35 140
---------------------- Page: 15 ----------------------
SIST EN 61029-2-4:2011
EN 61029-2-4:2011 – 14 –
18.1.103 Transparent screens
18.1.103.1 Transparent screen characteristics
The bench grinders and combined bench grinders shall be fitted with transparent screens
designed to prevent projection of particles towards the eyes and the face of the operator.
The transparent screens shall be adjustable and of such dimensions that in normal positions of
grinding and polishing, including in a vertical plane above the wheel or the brush, the operator
shall see the working part of the wheel or of the brush only through the screen.
The operation of adjusting the screen shall not modify the adjustment of other parts of the
bench grinder or combined bench grinder.
The screen shall be made of transparent material having an appropriate resistance against
shocks and abrasion. Ply glass and polycarbonate are recommended. Other plastic materials
used must have an impact and resistance similar to ply glass and polycarbonate.
18.1.103.2 Minimal dimension of the transparent part of rectangular or trapezoidal
transparent screens
The minimal dimensions of the transparent part of screens for bench grinders equipped with
straight-sided cup wheels are identical to those of screens for bench grinders or combined
bench grinders equipped with straight-sided wheels. However, for bench grinders and for the
grinder side of the combined bench grinders, the thickness of straight-sided wheels shall be
replaced by the width of the working part of the s
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.