Bosch Gws 21230 H Manual

							Deutsch - 7
Trennschleifen
Beim Trennschleifen nicht drücken,
nicht verkanten, nicht oszillieren. 
Mit m äßigem, dem zu bearbeiten-
den Material angepassten Vor-
schub arbeiten. 
Auslaufende Trennschleifscheiben 
nicht durch seitliches Gegendr ü-
cken abbremsen.
Wichtig ist die Rich-
tung, in die man
trennt. 
Das Gerät muss
stets im Gegenlauf 
arbeiten; deshalb mit
dem Ger ät nicht in
die andere Richtung
fahren! Es besteht
sonst die Gefahr,
dass es  unkontrol-
liert  aus dem Schnitt
gedr ückt wird.
Trennschleifständer
Mit dem Trennschleifst änder  29 (Zubeh ör) k ön-
nen Werkst ücke l ängengleich im Winkel von
0 bis 45 ° zugeschnitten werden.
Die Sicherheits- und Arbeitshinweise in der ent-
sprechenden Bedienungsanleitung des Trenn-
schleifst änders sind strikt zu beachten. Nur Origi-
nal Bosch Trennschleifst änder verwenden.
Trennen von Gestein
 Das Gerät darf nur für Trockenschnitt/Tro-
ckenschliff verwendet werden.
Am besten eine Dia-
mant-Trennscheibe
verwenden. Zur Si-
cherheit gegen Ver-
kanten den Füh-
rungsschlitten 26
mit spezieller Ab-
saugschutzhaube
benutzen.
Das Ger ät nur mit Staubabsaugung betreiben.
Zus ätzlich Staubschutzmaske tragen.
Der Staubsauger
muss zum Absaugen
von Gesteinsstaub
zugelassen sein. 
Bosch bietet geeig- 
nete Staubsauger an. 
Das Gerät einschalten
und mit dem vorderen 
Teil des F ührungs-
schlittens auf das
Werkst ück setzen.
Das Ger ät mit m äßigem, dem zu bearbeitenden
Material angepassten Vorschub schieben (Bild). 
Beim Trennen besonders harter Werkstoffe, z.  B. 
Beton mit hohem Kieselgehalt, kann die Dia-
mant-Trennscheibe  überhitzen und dadurch be-
sch ädigt werden. Ein mit der Diamant-Trenn-
scheibe umlaufender Funkenkranz weist deutlich
darauf hin. 
In diesem Fall den Trennvorgang unterbrechen 
und die Diamant-Trennscheibe kurze Zeit unbe-
lastet bei Leerlaufdrehzahl abk ühlen lassen.
Merklich nachlassender Arbeitsfortschritt und
umlaufender Funkenkranz sind Anzeichen f ür
eine stumpf gewordene Diamant-Trennscheibe.
Durch kurze Schnitte in abrasivem Material (z.  B.
Kalksandstein) kann diese wieder gesch ärft wer-
den.
 29
12 • 1 609 929 F55 • TMS • 18.12.03 
						

							Deutsch - 8
Vor allen Arbeiten am Gerät Netzstecker 
ziehen.
Der Gerätekopf l ässt
sich zum Ger ätege-
h äuse in 90 °-Schrit-
ten drehen. Dadurch
kann der Ein-/Aus-
schalter f ür beson-
dere Arbeitsf älle in
eine g ünstigere
Handhabungsposi-
tion gebracht wer-
den; z. B. f ür Trenn-
arbeiten mit F üh-
rungsschlitten  26/Trennschleifst änder  29
(Zubeh ör) oder f ür Linksh änder.
Die vier Schrauben ganz herausdrehen. 
Den Ger ätekopf vorsichtig und  ohne vom Ge-
häuse abzunehmen  in die neue Position dre-
hen.
Die Schrauben wieder eindrehen und festziehen. 
Der Griff  28 lä sst sich zum Motorgeh äuse jeweils
um 90 ° nach links und nach rechts drehen. Da-
durch kann der Ein-/Ausschalter f ür besondere
Arbeitsf älle in eine g ünstigere Handhabungspo-
sition gebracht werden; z. B. f ür Trennarbeiten
mit F ührungsschlitten/Trennschleifst änder (Zu-
beh ör) und f ür Linksh änder.
Die Griffentriegelung  27 kräftig in Pfeilrichtung
ziehen (
) und gleichzeitig den Griff  28 in die ge-
w ünschte Position drehen () bis er einrastet.
Die Abbildung zeigt den Griff  28 um 90 ° gedreht.
Die Griffentriegelung  27 und der Ein-/Aus-
schalter  3 haben eine Sicherheitsverriege-
lung. 
Das Ger ät kann nicht eingeschaltet wer-
den, solange der Griff  28 nicht in einer der
drei m öglichen Positionen eingerastet ist.
Der Griff  28 lässt sich nicht entriegeln,
wenn der Ein-/Ausschalter  3 arretiert ist.
 Vor allen Arbeiten am Gerät Netzstecker
ziehen.
Ger ät und L üftungsschlitze stets sauber
halten, um gut und sicher zu arbeiten. 
Bei extremen Einsatzbedingungen kann 
sich bei der Bearbeitung von Metallen leit-
f ä higer Staub im Innern des Ger ätes abset-
zen. Die Schutzisolierung des Ger ätes
kann beeintr ächtigt werden. Es empfiehlt
sich in solchen F ällen die Verwendung ei-
ner station ären Absauganlage, h äufiges
Ausblasen der L üftungsschlitze und das
Vorschalten eines Fehlerstrom-Schutz-
schalters (FI).
Wenn die schwingungsd ämpfenden Elemente an
der Vibrationsd ämpfung  4 besch ädigt sind, z. B.
eingerissen, muss das Ger ät zur Wartung an den
Kundendienst geschickt werden (Anschrift siehe
Abschnitt  „Service und Kundenberater “).
Sollte das Ger ät trotz sorgf ältiger Herstellungs-
und Pr üfverfahren einmal ausfallen, ist die Repa-
ratur von einer autorisierten Kundendienststelle
f ü r Bosch-Elektrowerkzeuge ausf ühren zu las-
sen. 
Bei allen R ückfragen und Ersatzteilbestellungen
bitte unbedingt die 10-stellige Bestellnummer laut 
Typenschild des Ger ätes angeben.
Gerätekopf drehen
Gerätegriff drehen 
(GWS 24 / 26-180 / 230 (J)BV)
 27


 28
Wartung und Reinigung
13 • 1 609 929 F55 • TMS • 18.12.03 
						

							Deutsch - 9
Rohstoffrückgewinnung statt Müllentsorgung 
Gerät, Zubeh ör und Verpackung sollten einer
umweltgerechten Wiederverwertung zugef ührt
werden.
Diese Anleitung ist aus chlorfrei gefertigtem Re- 
cycling-Papier hergestellt. 
Zum sortenreinen Recycling sind Kunststoffteile 
gekennzeichnet. 
In Deutschland sind nicht mehr gebrauchsf ähige
Ger äte zum Recycling beim Handel abzugeben
oder (ausreichend frankiert) direkt einzuschicken 
an: 
Recyclingzentrum Elektrowerkzeuge 
Osteroder Landstra ße 3
37589 Kalefeld Explosionszeichnungen und Informationen
zu Ersatzteilen finden Sie unter:
www.bosch-pt.com 
www.powertool-portal.de
, das Internetportal
f ü r Handwerker und Heimwerker
www.ewbc.de , der Informations-Pool f ür Hand-
werk und Ausbildung
Deutschland
Robert Bosch GmbH 
Servicezentrum Elektrowerkzeuge
Zur Luhne 2
37589 Kalefeld
✆Service:.......................................  01 80 - 3 35 54 99
Fax:
........................................... +49 (0) 55 53 / 20 22 37
✆Kundenberater:......................  01 80 - 3 33 57 99
Österreich 
ABE Service GmbH 
Jochen-Rindt-Stra ße 1
1232 Wien
✆Service:.....................................  +43 (0)1 / 61 03 80
Fax:
...............................................  +43 (0)1 / 61 03 84 91
✆Kundenberater:............  +43 (0)1 / 797 22 3066
E-Mail: [email protected] 
Schweiz
✆Service:.................................  +41 (0)1 / 8 47 16 16
Fax:
..................................................  +41 (0)1 / 8 47 16 57
✆Kundenberater...............................  0 800 55 11 55
Wir erkl ären in alleiniger Verantwortung, dass
dieses Produkt mit den folgenden Normen oder 
normativen Dokumenten  übereinstimmt:
EN 50 144 gem äß den Bestimmungen der Richt-
linien 89/336/EWG, 98/37/EG.
Dr. Egbert Schneider Dr. Eckerhard Str ötgen
Senior Vice President  Head of Product 
Engineering Certification 
Robert Bosch GmbH, Gesch äftsbereich Elektrowerkzeuge
Änderungen vorbehalten
UmweltschutzService und Kundenberater
Konformitätserklärung
14 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 1
The machine is intended for cutting, roughing and 
brushing metal and stone materials without using
water. For cutting stone, a cutting guide is re-
quired. 
Slots in structural walls are subject to the Stand- 
ard DIN 1053, Part 1 or country-specific regula-
tions. 
These regulations are to be observed under all 
circumstances. Before beginning work, consult
the responsible structural engineer, architects or
the construction supervisor.Measured values determined according to
EN 50 144. 
Typically the A-weighted noise levels of the ma- 
chine are: Sound pressure level: 90 dB (A);
sound power level: 103 dB (A).
Wear hearing protection! 
The typical hand / arm vibration is below 2.5 m/s
2
(1.7 m/s2).
Tool Specifications
Angle GrinderGWS 21-180 HV  
PROFESSIONALGWS 21-230 HV  
PROFESSIONALGWS 24-180 BV  
PROFESSIONAL
Order number0 601 851 B..0 601 852 B..0 601 853 B..
With residual current-limit controlGWS 21-180 JHV  
PROFESSIONALGWS 21-230 JHV  
PROFESSIONALGWS 24-180 JBV  
PROFESSIONAL
Order number0 601 851 G..0 601 852 G..0 601 853 G..
Rated input power *[W]2 1002 1002 400
Output power[W]1 3501 3501 700
No-load speed[rpm]8 5006 5008 500
Grinding disc dia., max.[mm]180230180
Grinder spindle threadM 14M 14M 14
Weight without cable, approx.[kg]4.44.45.2
Protection class / II / II / II
Angle GrinderGWS 24-230 BV  
PROFESSIONALGWS 26-180 BV  
PROFESSIONALGWS 26-230 BV  
PROFESSIONAL
Order number0 601 854 B..0 601 855 B..0 601 856 B..
With residual current-limit controlGWS 24-230 JBV  
PROFESSIONALGWS 26-180 JBV  
PROFESSIONALGWS 26-230 JBV  
PROFESSIONAL
Order number0 601 854 G..0 601 855 G..0 601 856 G..
Rated input power *[W]2 4002 6002 600
Output power[W]1 7001 8001 800
No-load speed[rpm]6 5008 5006 500
Grinding disc dia., max.[mm]230180230
Grinder spindle threadM 14M 14M 14
Weight without cable, approx.[kg]5.25.25.2
Protection class / II / II / IIPlease observe the order number of your machine. The trade names of the \
individual machines may vary. 
Inrush currents cause short-time voltage drops. Under unfavourable power\
 supply conditions, other equipment may be 
affected. If the system impedance of the power supply is lower than 0.25\
 Ohm, disturbances are unlikely to occur. 
* The values given are valid for nominal voltages [U] of 230/240 V. For \
lower voltages and models for specific countries,  
these values can vary.
Intended Use
Information on Structures
Noise / Vibration Information
15 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 2
The numbering of the device elements refers to 
the illustration of the machine on the graphics
page. 
While reading the operating instructions, unfold 
the graphics page for the device and leave it
open. 1 Thread for auxiliary handle (3x)
 2 Spindle lock button
 3 On / Off switch
 4 Vibration damper
 5 Auxiliary handle
 6 Grinder spindle
 7 Protection guard
 8 Adjustment screw
 9 Clamping lever
 10 Mounting flange with O-ring
 11 Grinding / cutting disc *
 12 Clamping nut
 13 quick-clamping nut *  14
Clamping screw
 15 Coded projection
 16 Guard, grinding cup *
 17 Grinding cup *
 18 Two-pin spanner for clamping nut*
 19 Hand guard *
 20 Spacer discs *
 21 Rubber sanding plate *
 22 Sanding sheet *
 23 Round nut *
 24 Cup brush *
 25 Diamond cutting disc *
 26 Cutting guide with dust extraction protection 
guard *
 27 Handle unlocking button
 28 Handle
 29 Cutting grinder stand *
*Not all of the accessories illustrated or described are  
included as standard delivery.
Working safely with this ma- 
chine is possible only when the
operating and safety information
are read completely and the in-
structions contained therein are
strictly followed. In addition, the
general safety notes in the enclosed booklet
must be observed. Before using for the first
time, ask for a practical demonstration. 
 Wear protective glasses and hearing protec- 
tion.
 Wear additional protection equipment for your
safety, such as protective gloves, sturdy
shoes, hard hat and apron.
 The dust that is produced while working can be
detrimental to health, inflammable or explo-
sive. Suitable safety measures are required.
Examples: Some dusts are regarded as carci-
nogenic. Use suitable dust / chip extraction and
wear a dust respirator.
 Dust from light alloys can burn or explode. Al-
ways keep the workplace clean, as blends of
materials are particularly dangerous. 
If the mains cable is damaged or cut through
while working, do not touch the cable but im-
mediately pull the mains plug. Never use the
machine with a damaged cable.
 Connect machines that are used in the open
via a residual current device (RCD) with an ac-
tuating current of 30 mA maximum. Do not op-
erate the machine in rain or moisture.
 When working with the machine, always hold it
firmly with both hands and provide for a secure
stance.
 Secure the workpiece.  A workpiece clamped
with clamping devices or in a vice is held more
secure than by hand.
 Always direct the cable to the rear away from
the machine.
 Always switch the machine off and wait until it
has come to a standstill before placing it down.
 For power outage or when the mains plug is
pulled, unlock the On / Off switch immediately
and turn it to the off position. This prevents un-
controlled restarting.
 The machine must be used only for dry cutting /
grinding.
Machine Elements
For Your Safety
16 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 3
For all work with the machine, the auxiliary 
handle must be mounted.
 Hold the power tool only by the insulated
gripping surfaces, when performing an op-
eration where the cutting tool may run into
hidden wiring or its own cord.
Contact with a  “live ” wire will make exposed
metal parts of the tool  “live ” and shock the op-
erator.
 Use appropriate detectors to determine if
utility lines are hidden in the work area or
call the local utility company for assist-
ance.
Contact with electric lines can lead to fire and
electric shock. Damaging a gas line can lead
to explosion. Penetrating a water line causes
property damage or may cause an electric
shock.
 For work with grinding or cutting discs, the pro-
tection guard  7 must be mounted. For work
with the rubber sanding plate  21 or with the
cup brush  24/disc brush/flap disc, the hand
guard  19 (accessory) is to be mounted.
 Use dust extraction when working with stone.
The vacuum cleaner must be approved for ma-
sonry dust. When cutting stone, use the cutting
guide.
 Do not work with materials containing asbes-
tos.
 Use only grinding tools with a permissible
speed at least as high as the no-load speed of
the machine.
 Check grinding tools before use. The grinding
tool must be properly mounted and turn freely.
Perform a test run for at least 30  seconds with-
out load. Do not use damaged, out-of-round or
vibrating grinding tools.
 Protect the grinding tool from impact, shock
and grease.
 Apply the machine to the workpiece only when
switched on.
 Keep hands away from rotating grinding tools.
 Pay attention to the direction of rotation. Al-
ways hold the machine so that sparks and
grinding dust fly away from the body.
 When grinding metal, flying sparks are pro-
duced. Take care that no persons are endan-
gered. Due to danger of fire, no combustible
materials should be located in the vicinity
(spark flight zone). 
Be careful when cutting grooves, e.  g. in struc-
tural walls: See Information on Structures.
 Blocking the cutting disc leads to jerking reac-
tion forces on the machine. In this case switch
off the machine immediately.
 Pay attention to the dimensions of the grinding
disc. The mounting hole diameter must fit the
mounting flange  10 without play. Do not use
reducers or adapters.
 Never use cutting discs for rough grinding. Do
not exert any lateral pressure on the cutting
discs.
 Observe the manufacturer ’s instructions for
mounting and using grinding tools.
 Caution! The grinding tool runs on after the
machine is switched off.
 Do not clamp the machine in a vice.
 Never allow children to use the machine.
 Bosch is only able to ensure perfect operation
of the machine if the original accessories in-
tended for it are used.
 Before any work on the machine itself, pull
the mains plug.
 For work with grinding or cutting discs, the
protection guard 7 must be mounted.
Protection Guard with Locking Screw
The coded projection  15 on the protection
guard  7 ensures that only a guard that fits the
machine type can be mounted. 
Loosen the clamping screw  14, if necessary.
Place the protection guard  7 with coded projec-
tion  15 into the coded groove on the spindle col-
lar of the machine head  and rotate to the required 
position (working position). 
The closed side of the protection guard 7 
must always point to the operator. 
Tighten clamping screw  14.
Mounting the  
Protective Devices
17 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 4
Protection Guard with Quick Clamp
The protection guard is preadjusted to the 
diameter of the spindle collar. If required,
the tightening tension of the clamping
bracket can be changed by tightening or
loosening the adjustment screw 8. Always
ensure that the protection guard  7 is
seated tightly on the spindle collar.
Open the clamping lever  9.
Place the protection guard  7 on the spindle collar
of the machine head and turn to the required po-
sition (working position). 
To fasten the protection guard  7, close the
clamping lever  9.
The closed side of the protection guard 7 
must always point to the operator.
Auxiliary Handle
 For all work with the machine, the auxiliary
handle must be mounted.
Screw the auxiliary handle  5 into the head of the
machine according to the working method.
Vibration Damping
The integrated vibration damper  4 and the vibra-
tion-dampening auxiliary handle reduce occur-
ring vibrations to below 2.5 m/s
2 according to
EN 50 144, and enable vibrational-reduced and
thus more agreeable and secure working.
Do not make any alterations to the vi-
bration damper 4 and the auxiliary han-
dle. Do not continue to use damaged
parts.
Hand Guard
For work with the rubber sanding plate  21 or with
the cup brush  24/disc brush/flap disc, the hand
guard  19 (accessory) is to be mounted. The hand
guard  19 is fastened with the auxiliary handle  5. 
Before any work on the machine itself, pull
the mains plug.
Use only grinding tools with a permissi-
ble speed at least as high as the no-load
speed of the machine. 
Grinding and cutting discs become very 
hot while working; do not touch until
they have cooled.
 Clean the grinder spindle and all parts to be
mounted. For clamping and loosening the
grinding tools, lock the grinder spindle  6 with
the spindle lock button  2.
Actuate the spindle lock button 2 only when
the grinder spindle is at a standstill!
Grinding / Cutting Disc
Pay attention to the dimensions of the grinding
disc. The mounting hole diameter must fit the
mounting flange  10 without play. Do not use re-
ducers or adapters. 
When using a diamond cutting disc, take care 
that the direction-of-rotation arrow on the dia-
mond cutting disc and the direction of rotation of
the machine (direction-of-rotation arrow on the
machine head) agree. 
For mounting, see the illustration page.
Screw on the clamping nut  12 and tighten with
the two-pin spanner (see Section  “Quick-clamp-
ing Nut ”).
An O-ring (plastic 
part) is inserted in
the mounting
flange 10 around the
spigot.
If the O-ring is missing or is damaged,  it must
in all cases be replaced (Order No.
1 600 210 039) before the mounting flange  10 is
mounted.
After mounting the grinding tool and be-
fore switching on, check that the grind-
ing tool is correctly mounted and that it
can turn freely.
Mounting the Grinding Tools
 10
18 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 5
Flap Disc
Depending on the application, remove the protec- 
tion guard 7 and mount the hand guard  19. Place
the special mounting flange  10 (accessory, Order
No. 2 605 703 028) and the flap disc on the
grinder spindle  6. Screw on the clamping nut  12
and tighten with the two-pin spanner.
Rubber Sanding Plate 21
Depending on the application, remove the protec-
tion guard  7 and mount the hand guard  19.
Before mounting the rubber sanding pad  21,
place the 2 spacers  20 onto the grinding spindle.
For mounting, see the illustration page. 
Screw on the round nut  23 and tighten with the
two-pin spanner.
Cup Brush 24 / Disc Brush
Depending on the application, remove the protec- 
tion guard  7 and mount the hand guard  19.
The grinding tool must be able to be screwed
onto the grinding spindle  6 until it rests firmly
against the grinder spindle flange at the end of
the grinder spindle threads. Tighten with an
open-end spanner.
Grinding Cup
When working with grinding cups, use
the special guard 16.
The grinding cup  17 should always protrude
from the  guard  16 only as far as absolutely nec-
essary for the work to be performed in each case. 
Adjust the guard  16 to this distance.
For mounting, see the illustration page.
Screw on the clamping nut  12 and tighten with
the fitting offset two-pin spanner  18. Instead of the clamping nut
 12, the quick-clamp-
ing nut  13 (accessory) can be used. Grinding
tools can then be mounted without using tools.
The quick-clamping nut 13 may be used only 
for grinding and cutting discs. 
Use only a flawless, undamaged quick-clamp- 
ing nut 13. 
When screwing on, take care that the side 
with printing does not point to the grinding
disc. The arrow must point to the index
mark 30.
Lock the grinder
spindle with the spin-
dle lock button 2.
Tighten the quick-
clamping nut by
forcefully turning the
grinding disc in the
clockwise direction. 
A properly tightened 
undamaged, quick-
clamping nut can be
loosened by hand
turning the knurled
ring in anticlockwise
direction. 
Never loosen a tight 
quick-clamping nut
with pliers but use a
two-pin spanner.  In-
sert the two-pin
spanner as shown in
the illustration.
Quick Clamping Nut 
 2  30
 13
 2
19 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 6
All grinding tools mentioned in this operating 
manual instruction can be used. 
The permissible speed [rpm] or the circumferen- 
tial speed [m/s] of the grinding tools used must at
least match the values given in the table. 
Therefore, always observe the permissible
rotational / circumferential speed  on the label
of the grinding tool. 
Observe correct mains voltage:  The voltage of
the power source must agree with the voltage 
specified on the nameplate of the machine.
Equipment marked with 230 V can also be con-
nected to 220 V.
Switching On and Off
To  start  the machine, press the On / Off switch  3
forward and then down. 
To  lock-on , push the pressed On/Off switch  3
further forwards.
To  switch off  the machine, release the On / Off
switch  3 or push and release it then.
Switch version without lock 
(country-specific): 
To  start  the machine, press the On / Off switch  3
forward and then down.
To  switch off  the machine, release the On / Off
switch  3.
Test run! 
Check the grinding tool before use. The
grinding tool must be properly mounted
and rotate freely. Perform a test run of at
least 30 seconds without load. Do not use
damaged, out-of-round or vibrating grind-
ing tools.
Reduced Starting Current 
(Type J)
As a result of soft starting, a 13 A fuse is 
adequate.
A machine without reduced starting current
requires higher fuse protection (use at least
a 13 A time-delay fuse).
 Clamp the workpiece if it does not remain
stationary due to its own weight.
 Do not strain the machine so heavily that it
comes to a standstill.
 Grinding and cutting discs become very
hot while working; do not touch until they
have cooled.
Rough Grinding
The best roughing results are
achieved when setting the machine
at an angle of 30 ° to 40 °. Move the
machine back and forth with mod-
erate pressure. In this manner, the
workpiece will not become too hot,
does not discolour and no grooves
are formed.
Never use a cutting disc for roughing.
Flap Disc
With the flap disc (accessory), curved surfaces
and profiles (contour sanding) can be worked. 
Flap discs have a considerably higher service life 
than sanding sheets, lower noise level and lower
sanding temperatures.
Approved Grinding Tools
max.
[mm] [mm]
Db d [rpm] [m/s]
180 
230 8
822.2
22.2 8 500
6 500 80
80
180
230 –
––
–8 500
6 500 80
80
100 30 M 14 8 500 45
Starting Operation
b d
D
D
D
b d
Operating Instructions
20 • 1 609 929 F55 • TMS • 18.12.03 
						

							English - 7
Cutting
When cutting, do not press, jam or 
oscillate the machine. Work with
moderate feed, adapted to the ma-
terial being machined. 
Do not reduce the speed of running 
down cutting discs by applying
sideward pressure.The direction in
which the cutting is
performed is impor-
tant. 
The machine must 
always work in an
up-grinding motion.
Therefore, never
move the machine in
the other direction!
Otherwise, the dan-
ger exists of it being
pushed uncon-
trolled  out of the cut.
Grinder Stand
With the grinder stand  29 (accessory), work-
pieces can be cut at angles of 0 to 45 ° at the
same lengths. 
The safety notes and operating instructions in the 
respective operating instructions manual of the
angle grinder are to be strictly observed. Use only
original Bosch grinder stands.
Cutting Stone
 The machine must be used only for dry
cutting / grinding.
It is best to use a dia-
mond cutting disc. As
a safety measure
against jamming, use
the cutting guide 26
with the special dust
extraction protection
guard.
Operate the machine with dust extraction only. In
addition, wear a dust mask. The vacuum cleaner
must be approved for
the extraction of ma-
sonry dust. 
Bosch provides suit- 
able vacuum clean-
ers. 
Switch on the ma- 
chine and place the
front part of the cut-
ting guide on the
workpiece.
Slide the machine with moderate feed, adapted
to the material to be worked (Figure). 
For cutting especially hard material, e. g., con- 
crete with high pebble content, the diamond cut-
ting disc can overheat and become damaged as
a result. This is clearly indicated by circular
sparking, rotating with the diamond cutting disc. 
In this case, interrupt the cutting process and al- 
low the diamond cutting disc to cool by running
freely at no-load speed for a short time. 
Noticeable decreasing work progress and circu- 
lar sparking are indications of a diamond cutting
disc that has become dull. Briefly cutting into
abrasive material (e. g., lime-sand brick) can re-
sharpen the disc.
 29
21 • 1 609 929 F55 • TMS • 18.12.03