Bosch PROFESSIONAL GWS 6-125 User manual

Robert Bosch GmbH
Power Tools Division
70745 Leinfelden-Echterdingen
Germany
www.bosch-pt.com
1 619 P08 849 (2010.03) O / 218 WEU
GWS Professional
660 | 6-100 | 6-100 E | 6-115 | 6-115 E | 6-125 | 6-125 E | 850 C |
850 CE
de Originalbetriebsanleitung
en Original instructions
fr Notice originale
es Manual original
pt Manual original
it Istruzioni originali
nl Oorspronkelijke
gebruiksaanwijzing
da Original brugsanvisning
sv Bruksanvisning i original
no Original driftsinstruks
fi Alkuperäiset ohjeet
el Πρωτότυπο οδηγιών χρήσης
tr Orijinal işletme talimat
ar
fa
ΕΎϤϴϠόΗϞϴϐθΘϟ΍ΔϴϠλϷ΍
Ϡλ΍ έΎ ίήσ ΎϤϨϫ΍έ
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GWS 6-100 E
GWS 6-115 E
GWS 6-125 E
GWS 850 CE
Professional
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Bosch Power Tools 1 619 P08 849 | (12.3.10)
en
Safety Notes
General Power Tool Safety Warnings
Read all safety warnings and all
instructions. Failure to follow
the warnings and instructions may result in elec-
tric shock, fire and/or serious injury.
Save all warnings and instructions for future
reference.
The term “power tool” in the warnings refers to
your mains-operated (corded) power tool or
battery-operated (cordless) power tool.
1) Work area safety
a) Keep work area clean and well lit. Clut-
tered or dark areas invite accidents.
b) Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power
tools create sparks which may ignite the
dust or fumes.
c) Keep children and bystanders away
while operating a power tool. Distrac-
tions can cause you to lose control.
2) Electrical safety
a) Power tool plugs must match the outlet.
Never modify the plug in any way. Do not
use any adapter plugs with earthed
(grounded) power tools. Unmodified
plugs and matching outlets will reduce
risk of electric shock.
b) Avoid body contact with earthed or
grounded surfaces, such as pipes, radia-
tors, ranges and refrigerators. There is
an increased risk of electric shock if your
body is earthed or grounded.
c) Do not expose power tools to rain or wet
conditions. Water entering a power tool
will increase the risk of electric shock.
d) Do not abuse the cord. Never use the
cord for carrying, pulling or unplugging
the power tool. Keep cord away from
heat, oil, sharp edges and moving parts.
Damaged or entangled cords increase the
risk of electric shock.
e) When operating a power tool outdoors,
use an extension cord suitable for out-
door use. Use of a cord suitable for out-
door use reduces the risk of electric
shock.
f) If operating a power tool in a damp loca-
tion is unavoidable, use a residual cur-
rent device (RCD) protected supply. Use
of an RCD reduces the risk of electric
shock.
3) Personal safety
a) Stay alert, watch what you are doing and
use common sense when operating a
power tool. Do not use a power tool
while you are tired or under the influ-
ence of drugs, alcohol or medication. A
moment of inattention while operating
power tools may result in serious person-
al injury.
b) Use personal protective equipment. Al-
ways wear eye protection. Protective
equipment such as dust mask, non-skid
safety shoes, hard hat, or hearing protec-
tion used for appropriate conditions will
reduce personal injuries.
c) Prevent unintentional starting. Ensure
the switch is in the off-position before
connecting to power source and/or bat-
tery pack, picking up or carrying the
tool. Carrying power tools with your fin-
ger on the switch or energising power
tools that have the switch on invites acci-
dents.
d) Remove any adjusting key or wrench be-
fore turning the power tool on. A wrench
or a key left attached to a rotating part of
the power tool may result in personal inju-
ry.
e) Do not overreach. Keep proper footing
and balance at all times. This enables
better control of the power tool in unex-
pected situations.
f) Dress properly. Do not wear loose cloth-
ing or jewellery. Keep your hair, clothing
and gloves away from moving parts.
Loose clothes, jewellery or long hair can
be caught in moving parts.
WARNING
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1 619 P08 849 | (12.3.10) Bosch Power Tools
g) If devices are provided for the connec-
tion of dust extraction and collection fa-
cilities, ensure these are connected and
properly used. Use of dust collection can
reduce dust-related hazards.
4) Power tool use and care
a) Do not force the power tool. Use the cor-
rect power tool for your application. The
correct power tool will do the job better
and safer at the rate for which it was de-
signed.
b) Do not use the power tool if the switch
does not turn it on and off. Any power
tool that cannot be controlled with the
switch is dangerous and must be re-
paired.
c) Disconnect the plug from the power
source and/or the battery pack from the
power tool before making any adjust-
ments, changing accessories, or storing
power tools. Such preventive safety
measures reduce the risk of starting the
power tool accidentally.
d) Store idle power tools out of the reach of
children and do not allow persons unfa-
miliar with the power tool or these in-
structions to operate the power tool.
Power tools are dangerous in the hands of
untrained users.
e) Maintain power tools. Check for mis-
alignment or binding of moving parts,
breakage of parts and any other condi-
tion that may affect the power tool’s op-
eration. If damaged, have the power tool
repaired before use. Many accidents are
caused by poorly maintained power tools.
f) Keep cutting tools sharp and clean. Prop-
erly maintained cutting tools with sharp
cutting edges are less likely to bind and
are easier to control.
g) Use the power tool, accessories and tool
bits etc. in accordance with these in-
structions, taking into account the work-
ing conditions and the work to be per-
formed. Use of the power tool for
operations different from those intended
could result in a hazardous situation.
5) Service
a) Have your power tool serviced by a qual-
ified repair person using only identical
replacement parts. This will ensure that
the safety of the power tool is maintained.
Safety Warnings for Angle Grinder
Safety Warnings common for Grinding, Sand-
ing, Wire Brushing or Abrasive Cutting Off Op-
erations
fThis power tool is intended to function as a
grinder, sander, wire brush or cut-off tool.
Read all safety warnings, instructions, illus-
trations and specifications provided with
this power tool. Failure to follow all instruc-
tions listed below may result in electric
shock, fire and/or serious injury.
fThis power tool is not recommended for
polishing. Operations for which the power
tool was not designed may create a hazard
and cause personal injury.
fDo not use accessories which are not spe-
cifically designed and recommended by the
tool manufacturer. Just because the acces-
sory can be attached to your power tool, it
does not assure safe operation.
fThe rated speed of the accessory must be at
least equal to the maximum speed marked
on the power tool. Accessories running fast-
er than their rated speed can break and fly
apart.
fThe outside diameter and the thickness of
your accessory must be within the capacity
rating of your power tool. Incorrectly sized
accessories cannot be adequately guarded
or controlled.
fThe arbor size of wheels, flanges, backing
pads or any other accessory must properly
fit the spindle of the power tool. Accesso-
ries with arbor holes that do not match the
mounting hardware of the power tool will run
out of balance, vibrate excessively and may
cause loss of control.
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Bosch Power Tools 1 619 P08 849 | (12.3.10)
fDo not use a damaged accessory. Before
each use inspect the accessory such as
abrasive wheels for chips and cracks, back-
ing pad for cracks, tear or excess wear, wire
brush for loose or cracked wires. If power
tool or accessory is dropped, inspect for
damage or install an undamaged accessory.
After inspecting and installing an accesso-
ry, position yourself and bystanders away
from the plane of the rotating accessory
and run the power tool at maximum no-load
speed for one minute. Damaged accessories
will normally break apart during this test
time.
fWear personal protective equipment. De-
pending on application, use face shield,
safety goggles or safety glasses. As appro-
priate, wear dust mask, hearing protectors,
gloves and workshop apron capable of stop-
ping small abrasive or workpiece frag-
ments. The eye protection must be capable
of stopping flying debris generated by vari-
ous operations. The dust mask or respirator
must be capable of filtrating particles gener-
ated by your operation. Prolonged exposure
to high intensity noise may cause hearing
loss.
fKeep bystanders a safe distance away from
work area. Anyone entering the work area
must wear personal protective equipment.
Fragments of workpiece or of a broken ac-
cessory may fly away and cause injury be-
yond immediate area of operation.
fHold power tool by insulated gripping sur-
faces only, when performing an operation
where the cutting accessory may contact
hidden wiring or its own cord. Cutting ac-
cessory contacting a “live” wire may make ex-
posed metal parts of the power tool “live”
and shock the operator.
fPosition the cord clear of the spinning ac-
cessory. If you lose control of the power tool,
the cord may be cut or snagged and your
hand or arm may be pulled into the spinning
accessory.
fNever lay the power tool down until the ac-
cessory has come to a complete stop. The
spinning accessory may grab the surface and
pull the power tool out of your control.
fDo not run the power tool while carrying it
at your side. Accidental contact with the
spinning accessory could snag your clothing,
pulling the accessory into your body.
fRegularly clean the power tool’s air vents.
The motor’s fan will draw the dust inside the
housing and excessive accumulation of pow-
dered metal may cause electrical hazards.
fDo not operate the power tool near flamma-
ble materials. Sparks could ignite these ma-
terials.
fDo not use accessories that require liquid
coolants. Using water or other liquid cool-
ants may result in electrocution or shock.
Kickback and related warnings
fKickback is a sudden reaction to a pinched or
snagged rotating wheel, backing pad, brush
or any other accessory. Pinching or snagging
causes rapid stalling of the rotating accesso-
ry which in turn causes the uncontrolled
power tool to be forced in the direction op-
posite of the accessory’s rotation at the
point of the binding.
For example, if an abrasive wheel is snagged
or pinched by the workpiece, the edge of the
wheel that is entering into the pinch point
can dig into the surface of the material caus-
ing the wheel to climb out or kick out. The
wheel may either jump toward or away from
the operator, depending on direction of the
wheel’s movement at the point of pinching.
Abrasive wheels may also break under these
conditions.
Kickback is the result of power tool misuse
and/or incorrect operating procedures or
conditions and can be avoided by taking
proper precautions as given below.
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1 619 P08 849 | (12.3.10) Bosch Power Tools
fMaintain a firm grip on the power tool and
position your body and arm to allow you to
resist kickback forces. Always use auxiliary
handle, if provided, for maximum control
over kickback or torque reaction during
start-up. The operator can control torque re-
actions or kickback forces, if proper precau-
tions are taken.
fNever place your hand near the rotating ac-
cessory. Accessory may kickback over your
hand.
fDo not position your body in the area where
power tool will move if kickback occurs.
Kickback will propel the tool in direction op-
posite to the wheel’s movement at the point
of snagging.
fUse special care when working corners,
sharp edges, etc. Avoid bouncing and snag-
ging the accessory. Corners, sharp edges or
bouncing have a tendency to snag the rotat-
ing accessory and cause loss of control or
kickback.
fDo not attach a saw chain woodcarving
blade or toothed saw blade. Such blades
create frequent kickback and loss of control
over the power tool.
Additional safety instructions for grinding and
cutting off operations
fUse only wheel types that are recommend-
ed for your power tool and the specific
guard designed for the selected wheel.
Wheels for which the power tool was not de-
signed cannot be adequately guarded and
are unsafe.
fThe guard must be securely attached to the
power tool and positioned for maximum
safety, so the least amount of wheel is ex-
posed towards the operator. The guard
helps to protect operator from broken wheel
fragments and accidental contact with
wheel.
fWheels must be used only for recommend-
ed applications. For example: do not grind
with the side of the cut-off wheel. Abrasive
cut-off wheels are intended for peripheral
grinding; side forces applied to these wheels
may cause them to shatter.
fAlways use undamaged wheel flanges that
are of correct size and shape for your se-
lected wheel. Proper wheel flanges support
the wheel thus reducing the possibility of
wheel breakage. Flanges for cut-off wheels
may be different from grinding wheel flanges.
fDo not use worn down wheels from larger
power tools. Wheels intended for larger
power tools are not suitable for the higher
speed of a smaller tool and may burst.
Additional safety warnings specific for abra-
sive cutting off operations
fDo not “jam” the cut-off wheel or apply ex-
cessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibili-
ty to twisting or binding of the wheel in the
cut and the possibility of kickback or wheel
breakage.
fDo not position your body in line with and
behind the rotating wheel. When the wheel,
at the point of operation, is moving away
from your body, the possible kickback may
propel the spinning wheel and the power
tool directly at you.
fWhen wheel is binding or when interrupting
a cut for any reason, switch off the power
tool and hold the power tool motionless un-
til the wheel comes to a complete stop. Nev-
er attempt to remove the cut-off wheel from
the cut while the wheel is in motion other-
wise kickback may occur. Investigate and
take corrective action to eliminate the cause
of wheel binding.
fDo not restart the cutting operation in the
workpiece. Let the wheel reach full speed
and carefully reenter the cut. The wheel may
bind, walk up or kickback if the power tool is
restarted in the workpiece.
fSupport panels or any oversized workpiece
to minimize the risk of wheel pinching and
kickback. Large workpieces tend to sag un-
der their own weight. Supports must be
placed under the workpiece near the line of
cut and near the edge of the workpiece on
both sides of the wheel.
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Bosch Power Tools 1 619 P08 849 | (12.3.10)
fUse extra caution when making a “pocket
cut” into existing walls or other blind areas.
The protruding wheel may cut gas or water
pipes, electrical wiring or objects that can
cause kickback.
Safety warnings specific for sanding opera-
tions
fDo not use excessively oversized sanding
disc paper. Follow manufacturers recom-
mendations, when selecting sanding paper.
Larger sanding paper extending beyond the
sanding pad presents a laceration hazard and
may cause snagging, tearing of the disc, or
kickback.
Safety warnings specific for wire brushing
operations
fBe aware that wire bristles are thrown by
the brush even during ordinary operation.
Do not overstress the wires by applying ex-
cessive load to the brush. The wire bristles
can easily penetrate light clothing and/or
skin.
fIf the use of a guard is recommended for
wire brushing, do not allow any interfer-
ence of the wire wheel or brush with the
guard. Wire wheel or brush may expand in
diameter due to work load and centrifugal
forces.
Additional safety warnings
Wear safety goggles.
fUse suitable detectors to determine if utili-
ty lines are hidden in the work area or call
the local utility company for assistance.
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.
fRelease the On/Off switch and set it to the
off position when the power supply is inter-
rupted, e. g., in case of a power failure or
when the mains plug is pulled. This prevents
uncontrolled restarting.
fWhen working stone, use dust extraction.
The vacuum cleaner must be approved for
the extraction of stone dust. Using this
equipment reduces dust-related hazards.
fWhen working with the machine, always
hold it firmly with both hands and provide
for a secure stance. The power tool is guided
more secure with both hands.
fSecure the workpiece. A workpiece clamped
with clamping devices or in a vice is held
more secure than by hand.
fKeep your workplace clean. Blends of mate-
rials are particularly dangerous. Dust from
light alloys can burn or explode.
fNever use the machine with a damaged ca-
ble. Do not touch the damaged cable and
pull the mains plug when the cable is dam-
aged while working. Damaged cables in-
crease the risk of an electric shock.
Products sold in GB only: Your product is fitted
with an BS 1363/A approved electric plug with
internal fuse (ASTA approved to BS 1362).
If the plug is not suitable for your socket outlets,
it should be cut off and an appropriate plug fit-
ted in its place by an authorised customer serv-
ice agent. The replacement plug should have the
same fuse rating as the original plug.
The severed plug must be disposed of to avoid a
possible shock hazard and should never be in-
serted into a mains socket elsewhere.
Products sold in AUS and NZ only: Use a resid-
ual current device (RCD) with a rated residual
current of 30 mA or less.
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26 | English
1 619 P08 849 | (12.3.10) Bosch Power Tools
Functional Description
Read all safety warnings and all in-
structions. Failure to follow the
warnings and instructions may re-
sult in electric shock, fire and/or se-
rious injury.
While reading the operating instructions, unfold
the graphics page for the machine and leave it
open.
Intended Use
The machine is intended for cutting, roughing
and brushing of metal and stone materials with-
out the use of water.
For cutting with bonded abrasives, a special cut-
ting guide (accessory) must be used.
When cutting in stone, provide for sufficient
dust extraction.
With approved sanding tools, the machine can
be used for sanding with sanding discs.
Product Features
The numbering of the product features refers to
the illustration of the machine on the graphics
page.
1Spindle lock button
2On/Off switch
3Allen key
4Thumbwheel for speed preselection
(GWS 6-100 E/GWS 6-115 E/
GWS 6-125 E/GWS 850 CE)
5Auxiliary handle (insulated gripping surface)
6Grinder spindle
7Protection guard for grinding
8Locking screw for protection guard
9Mounting flange with O-ring
10 Grinding disc*
11 Clamping nut
12 Quick-clamping nut *
13 Carbide grinding head*
14 Protection guard for cutting*
15 Cutting disc*
16 Hand guard*
17 Rubber sanding plate*
18 Sanding sheet*
19 Round nut*
20 Cup brush*
21 Cutting guide with dust extraction protec-
tion guard *
22 Diamond cutting disc*
23 Handle (insulated gripping surface)
*Accessories shown or described are not part of the
standard delivery scope of the product. A complete
overview of accessories can be found in our acces-
sories program.
Noise/Vibration Information
Measured sound values determined according
to EN 60745.
Typically the A-weighted noise levels of the
product are: Sound pressure level 86 dB(A);
Sound power level 97 dB(A). Uncertainty
K=3dB.
Wear hearing protection!
Vibration total values (triax vector sum) deter-
mined according to EN 60745:
Surface grinding: Vibration emission value
ah=7.0 m/s2, Uncertainty K=1.5 m/s2,
Disk sanding: Vibration emission value
ah=4.0 m/s2, Uncertainty K=1.5 m/s2.
The vibration emission level given in this infor-
mation sheet has been measured in accordance
with a standardised test given in EN 60745 and
may be used to compare one tool with another.
It may be used for a preliminary assessment of
exposure.
The declared vibration emission level repre-
sents the main applications of the tool. However
if the tool is used for different applications, with
different accessories or poorly maintained, the
vibration emission may differ. This may signifi-
cantly increase the exposure level over the total
working period.
An estimation of the level of exposure to vibra-
tion should also take into account the times
when the tool is switched off or when it is run-
ning but not actually doing the job. This may sig-
nificantly reduce the exposure level over the to-
tal working period.
Identify additional safety measures to protect
the operator from the effects of vibration such
as: maintain the tool and the accessories, keep
the hands warm, organisation of work patterns.
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Bosch Power Tools 1 619 P08 849 | (12.3.10)
Declaration of Conformity
We declare under our sole responsibility that
the product described under “Technical Data” is
in conformity with the following standards or
standardization documents: EN 60745 accord-
ing to the provisions of the directives
2004/108/EC, 2006/42/EC.
Technical file at:
Robert Bosch GmbH, PT/ESC,
D-70745 Leinfelden-Echterdingen
Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
01.03.2010
Technical Data
Dr. Egbert Schneider
Senior Vice President
Engineering
Dr. Eckerhard Strötgen
Head of Product
Certification
Angle Grinder GWS...
Professional
660 6-100 6-100 E 6-115 6-115 E
Article number 0 601 ... 375 0.. 375 0.. 375 7.. 375 0.. 375 7..
375 9..
Rated power input W660670 670 670 670
Output power W390400 400 400 400
Rated speed min-1 11000 11000 11000 11000 11000
Speed control adjustment min-1 –– 2800
– 11000
– 2800
– 11000
Grinding disc diameter, max. mm 115 100 100 115 115
Thread of grinder spindle M 14 M 10 M 10 M 14 M 14
Thread length (max.) of
grinder spindle mm 22 17 17 22 22
Reduced starting current –––––
Constant electronic control –––––
Speed preselection – – z–z
Weight according to
EPTA-Procedure 01/2003 kg 1.9 1.8 1.8 1.9 1.9
Protection class /II /II /II /II /II
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28 | English
1 619 P08 849 | (12.3.10) Bosch Power Tools
Assembly
Mounting the Protective Devices
fBefore any work on the machine itself, pull
the mains plug.
Note: After breakage of the grinding disc during
operation or damage to the holding fixtures on
the protection guard/power tool, the machine
must promptly be sent to an after-sales service
agent for maintenance (for addresses, see sec-
tion „After-sales Service and Customer
Assistance“.
Protection Guard for Grinding
Place the protection guard 7on the spindle col-
lar. Adjust the position of the protection guard 7
to the requirements of the operation. Lock the
protection guard 7tightening the locking screw
8with an allen key 3.
fAdjust the protection guard 7 in such a man-
ner that sparking is prevented in the direc-
tion of the operator.
Note: The encoding keys on the protection
guard 7ensure that only a protection guard that
fits the machine type can be mounted.
Protection Guard for Cutting
fFor cutting with bonded abrasives, always
use the protection guard for cutting 14.
Angle Grinder GWS...
Professional
6-125 6-125 E 850 C 850 C 850 CE
Article number 0 601 ... 375 1.. 375 9.. 377 5.. 377 7..
377 9..
378 7..
378 9..
Rated power input W670670 850 850 850
Output power W400400 490 490 490
Rated speed min-1 11000 11000 11000 11000 11000
Speed control adjustment min-1 –2800
–11000
–– 2800
– 11000
Grinding disc diameter, max. mm 125 125 115 125 125
Thread of grinder spindle M 14 M 14 M 14 M 14 M 14
Thread length (max.) of grind-
er spindle mm 22 22 22 22 22
Reduced starting current – – zzz
Constant electronic control – – zzz
Speed preselection –z– – z
Weight according to
EPTA-Procedure 01/2003 kg 1.9 1.9 1.9 1.9 1.9
Protection class /II /II /II /II /II
The values given are valid for nominal voltages [U] of 230/240 V. For lower voltage and models for specific countries,
these values can vary.
Please observe the article number on the type plate of your machine. The trade names of the individual machines
may vary.
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Bosch Power Tools 1 619 P08 849 | (12.3.10)
fProvide for sufficient dust extraction when
cutting stone.
The protection guard for cutting 14 is mounted
in the same manner as the protection guard for
grinding 7.
Cutting Guide with Dust Extraction Protection
Guard
The cutting guide with dust extraction protec-
tion guard 21 is mounted in the same manner as
the protection guard for grinding 7.
Auxiliary Handle
fOperate your machine only with the auxilia-
ry handle 5.
Screw the auxiliary handle 5on the right or left
of the machine head depending on the working
method.
Hand Guard
fFor operations with the rubber sanding
plate 17 or with the cup brush/wheel
brush/flap disc, always mount the hand
guard 16.
The hand guard 16 is fastened with the auxiliary
handle 5.
Mounting the Grinding Tools
fBefore any work on the machine itself, pull
the mains plug.
fGrinding and cutting discs become very hot
while working; do not touch until they have
cooled.
Clean the grinder spindle 6and all parts to be
mounted.
For clamping and loosening the grinding tools,
lock the grinder spindle with the spindle lock
button 1.
fActuate the spindle lock button only when
the grinder spindle is at a standstill. Other-
wise, the machine may become damaged.
Grinding/Cutting Disc
Pay attention to the dimensions of the grinding
tools. The mounting hole diameter must fit the
mounting flange without play. Do not use reduc-
ers or adapters.
When using diamond cutting discs, pay atten-
tion that the direction-of-rotation arrow on the
diamond cutting disc and the direction of rota-
tion of the machine (see direction-of-rotation ar-
row on the machine head) agree.
See graphics page for the mounting sequence.
To fasten the grinding/cutting disc, screw on
the clamping nut 11 and tighten with the two-
pin spanner; see Section “Quick-clamping Nut”.
fAfter mounting the grinding tool and before
switching on, check that the grinding tool is
correctly mounted and that it can turn free-
ly. Make sure that the grinding tool does
not graze against the protection guard or
other parts.
Mounting flange for grinding
spindle M 14: An O-ring (plas-
tic part) is inserted in the
mounting flange 9around the
centring collar. If the O-ring is
missing or is damaged, it must
in all cases be replaced (article
number 1 600 210 039) before
the mounting flange 9is mounted.
Flap Disc
fFor operations with the flap disc, always
mount the hand guard 16.
Rubber Sanding Plate
fFor operations with the rubber sanding
plate 17, always mount the hand guard 16.
See graphics page for the mounting sequence.
Screw on the round nut 19 and tighten with the
two-pin spanner.
Cup Brush/Disc Brush
fFor operations with the cup brush/wheel
brush, always mount the hand guard 16.
See graphics page for the mounting sequence.
The cup brush/disc brush must be able to be
screwed onto the grinder spindle until it rests
firmly against the grinder spindle flange at the
end of the grinder spindle threads. Tighten the
cup brush/disc brush with an open-end span-
ner.
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30 | English
1 619 P08 849 | (12.3.10) Bosch Power Tools
Quick-clamping Nut
For convenient changing of grinding tools with-
out the use of additional tools, you can use the
quick-clamping nut 12 instead of the clamping
nut 11.
fThe quick-clamping nut 12 may be used only
for grinding or cutting discs.
Use only a flawless, undamaged quick-clamp-
ing nut 12.
When screwing on, pay attention that the side
of the quick-clamping nut 12 with printing
does not face the grinding disc; the arrow must
point to the index mark 24.
Lock the grinder spin-
dle with the spindle
lock button 1. To tight-
en the quick-clamping
nut, firmly turn the
grinding disc in clock-
wise direction.
A properly attached,
undamaged quick-
clamping nut can be
loosened by hand
when turning the
knurled ring in anti-
clockwise direction.
Never loosen a tight
quick-clamping nut
with pliers. Always
use the two-pin span-
ner. Insert the two-pin spanner as shown in the
illustration.
Approved Grinding Tools
All grinding tools mentioned in these operating
instructions can be used.
The permissible speed [min-1] or the circumfer-
ential speed [m/s] of the grinding tools used
must at least match the values given in the table.
Therefore, observe the permissible rotation-
al/circumferential speed on the label of the
grinding tool.
Rotating the Machine Head
fBefore any work on the machine itself, pull
the mains plug.
The machine head
can be rotated with
respect to the ma-
chine housing in
90° steps. In this
manner, the On/Off
switch can be
brought into a more
convenient posi-
tion for special
working situations,
e.g. for left-handed
persons.
Completely unscrew the four screws. Rotate the
machine head carefully, without removing it
from the housing, to the new position. Screw in
and tighten the four screws again.
24
max.
[mm] [mm]
D b d [min-1][m/s]
100
115
125
6
6
6
16.0
22.2
22.2
11000
11000
11000
80
80
80
100
115
125
–
–
–
–
–
–
11000
11000
11000
80
80
80
70
75
30
30
M 10
M14
11000
11000
45
45
b
d
D
D
D
b
d
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English | 31
Bosch Power Tools 1 619 P08 849 | (12.3.10)
Dust/Chip Extraction
fDusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one’s health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in
connection with wood-treatment additives
(chromate, wood preservative). Materials
containing asbestos may only be worked by
specialists.
– Use dust extraction whenever possible.
– Provide for good ventilation of the work-
ing place.
– It is recommended to wear a P2 filter-
class respirator.
Observe the relevant regulations in your
country for the materials to be worked.
Operation
Starting Operation
fObserve correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
When operating the machine with power from
mobile generators that do not have sufficient re-
serve capacity or are not equipped with suitable
voltage control with starting current amplifica-
tion, loss of performance or untypical behavior
can occur upon switching on.
Please observe the suitability of the power gen-
erator being used, particularly with regard to
the mains voltage and frequency.
Switching On and Off
To start the power tool, push the On/Off switch
2forwards.
To lock the On/Off switch 2, press the On/Off
switch 2down at the front until it latches.
To switch off the power tool, release the On/Off
switch 2or, if it is locked, briefly push down the
back of the On/Off switch 2and then release it.
fCheck grinding tools before using. The
grinding tool must be mounted properly
and be able to move freely. Carry out a test
run for at least one minute with no load. Do
not use damaged, out-of-centre or vibrating
grinding tools. Damaged grinding tools can
burst and cause injuries.
Reduced starting current
(GWS 850 C/GWS 850 CE)
The electronic reduced starting current limits
the power consumption when switching the tool
on and enables operation from a 13 ampere
fuse.
Constant Electronic Control
(GWS 850 C/GWS 850 CE)
Constant electronic control holds the speed
constant at no-load and under load, and ensures
uniform working performance.
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32 | English
1 619 P08 849 | (12.3.10) Bosch Power Tools
Speed preselection (GWS 6-100 E/GWS 6-115 E/ GWS 6-125 E/GWS 850 CE)
The required speed can be preselected with the thumbwheel 4(also while running).
The data in the following table are recommended values.
Working Advice
fExercise caution when cutting slots in
structural walls; see Section “Information
on Structures ”.
fClamp the workpiece if it does not remain
stationary due to its own weight.
fDo not strain the machine so heavily that it
comes to a standstill.
fAfter heavily straining the power tool, con-
tinue to run it at no-load for several minutes
to cool down the accessory.
fGrinding and cutting discs become very hot
while working; do not touch until they have
cooled.
fDo not use the power tool with a cut-off
stand.
Rough Grinding
fNever use a cutting disc for roughing.
The best roughing results are achieved when
setting the machine at an angle of 30° to 40°.
Move the machine back and forth with moderate
pressure. In this manner, the workpiece will not
become too hot, does not discolour and no
grooves are formed.
Flap Disc
With the flap disc (accessory), curved surfaces
and profiles can be worked.
Flap discs have a considerably higher service
life, lower noise levels and lower sanding tem-
peratures than conventional sanding sheets.
Cutting Metal
fFor cutting with bonded abrasives, always
use the protection guard for cutting 14.
When cutting, work with moderate feed, adapt-
ed to the material being cut. Do not exert pres-
sure onto the cutting disc, tilt or oscillate the
machine.
Do not reduce the speed of running down cut-
ting discs by applying sideward pressure.
The machine must
always work in an
up-grinding mo-
tion. Otherwise,
the danger exists
of it being pushed
uncontrolled out
of the cut.
When cutting pro-
files and square
bar, it is best to
start at the small-
est cross section.
Material Application Accessory Thumbwheel
Position
Metal Removing paint Sanding disc 2 – 3
Wood, metal Brushing, rust removal Cup brush, sanding disc 3
Metal, masonry Grinding Grinding disc 4 – 6
Metal Rough grinding Grinding disc 6
Masonry, stone Cutting Cutting disc and cutting guide
(Cutting masonry/stone is permitted
only with use of the cutting guide)
6
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English | 33
Bosch Power Tools 1 619 P08 849 | (12.3.10)
Cutting Stone
fProvide for sufficient dust extraction when
cutting stone.
fWear a dust respirator.
fThe machine may be used only for dry cut-
ting/grinding.
For cutting stone, it is best to use a diamond
cutting disc.
When using the cutting guide with dust extrac-
tion protection guard 21, the vacuum cleaner
must be approved for vacuuming masonry dust.
Suitable vacuum cleaners are available from
Bosch.
Switch on the ma-
chine and place
the front part of
the cutting guide
on the workpiece.
Slide the machine
with moderate
feed, adapted to
the material to be
worked.
For cutting expecially hard material, e. g., con-
crete with high pebble content, the diamond
cutting 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
the machine for a short time at maximum speed
with no load.
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 again.
Information on Structures
Slots in structural walls are subject to the
Standard DIN 1053 Part 1, or country-specific
regulations.
These regulations are to be observed under all
circumstances. Before beginning work, consult
the responsible structural engineer, architect or
the construction supervisor.
Maintenance and Service
Maintenance and Cleaning
fBefore any work on the machine itself, pull
the mains plug.
fFor safe and proper working, always keep
the machine and ventilation slots clean.
fIn extreme conditions, always use dust ex-
traction as far as possible. Blow out ventila-
tion slots frequently and install a residual
current device (RCD). When working metals,
conductive dust can settle in the interior of
the power tool. The total insulation of the
power tool can be impaired.
Please store and handle the accessory(-ies)
carefully.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
After-sales Service and Customer
Assistance
Our after-sales service responds to your ques-
tions concerning maintenance and repair of your
product as well as spare parts. Exploded views
and information on spare parts can also be
found under:
www.bosch-pt.com
Our customer service representatives can an-
swer your questions concerning possible appli-
cations and adjustment of products and acces-
sories.
OBJ_BUCH-161-005.book Page 33 Friday, March 12, 2010 9:17 AM

34 | English
1 619 P08 849 | (12.3.10) Bosch Power Tools
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: [phone]
Fax: [phone]
E-Mail: [email protected]
Ireland
Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: [phone]
Fax: [phone]
Australia, New Zealand and Pacific Islands
Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: [phone]
Fax: [phone]
Inside New Zealand:
Phone: [phone]
Fax: [phone]
Outside AU and NZ:
Phone: [phone]
www.bosch.com.au
Republic of South Africa
Customer service
Hotline: [phone]
Gauteng – BSC Service Centre
35 Roper Street, New Centre
Johannesburg
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected].za
KZN – BSC Service Centre
Unit E, Almar Centre
143 Crompton Street
Pinetown
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Western Cape – BSC Service Centre
Democracy Way, Prosperity Park
Milnerton
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected].za
Bosch Headquarters
Midrand, Gauteng
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]
Disposal
The machine, accessories and packaging should
be sorted for environmental-friendly recycling.
Only for EC countries:
Do not dispose of power tools in-
to household waste!
According the European Guideline
2002/96/EC for Waste Electrical
and Electronic Equipment and its
implementation into national
right, power tools that are no longer usable
must be collected separately and disposed of in
an environmentally correct manner.
Subject to change without notice.
OBJ_BUCH-161-005.book Page 34 Friday, March 12, 2010 9:17 AM