BOSCH 1 609 92A 5RF Universal Circ 12 Instruction Manual

: June 1, 2024
: Bosch

1 609 92A 5RF Universal Circ 12

GWS 12V-76 Professional

Robert Bosch Power Tools GmbH
70538 Stuttgart
GERMANY
www.bosch-pt.com
1 609 92A 5RF (2023.06) O / 299

Original instructions

Safety Instructions

General Power Tool Safety Warnings

WARNING Read all safety warnings, instructions,
illustrations and specifications
provided with this power tool. Failure to follow all instructions
listed below may result in electric 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.

Work area safety

▸ Keep work area clean and well lit. Cluttered or dark
areas invite accidents.
▸ 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.
▸ Keep children and bystanders away while operating a
power tool. Distractions can cause you to lose control.
Electrical safety
▸ 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.
▸ Avoid body contact with earthed or grounded surfaces,
such as pipes, radiators, ranges and refrigerators.
There is an increased risk of electric shock if your
body is earthed or grounded.
▸ Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of electric
shock.
▸ 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 or moving parts.
Damaged or entangled cords increase the risk of electric
shock.
▸ When operating a power tool outdoors, use an extension
cord suitable for outdoor use. Use of a cord suitable
for outdoor use reduces the risk of electric shock.
▸ If operating a power tool in a damp location is unavoidable,
use a residual current device (RCD) protected
supply. Use of an RCD reduces the risk of electric
shock.

Personal safety

▸ 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 influence
of drugs, alcohol or medication. A moment of inattention
while operating power tools may result in serious personal
injury.
▸ Use personal protective equipment. Always wear eye
protection. Protective equipment such as a dust mask,
non-skid safety shoes, hard hat or hearing protection
used for appropriate conditions will reduce personal injuries.
▸ Prevent unintentional starting. Ensure the switch is in
the off-position before connecting to power source
and/or battery pack, picking up or carrying the tool.
Carrying power tools with your finger on the switch or energising
power tools that have the switch on invites accidents.
▸ Remove any adjusting key or wrench before turning
the power tool on. A wrench or a key left attached to a
rotating part of the power tool may result in personal injury.
▸ Do not overreach. Keep proper footing and balance at
all times. This enables better control of the power tool in
unexpected situations.
▸ Dress properly. Do not wear loose clothing or jewellery.
Keep your hair and clothing away from moving
parts. Loose clothes, jewellery or long hair can be caught
in moving parts.
▸ If devices are provided for the connection of dust extraction
and collection facilities, ensure these are connected
and properly used. Use of dust collection can reduce
dust-related hazards.
▸ Do not let familiarity gained from frequent use of tools
allow you to become complacent and ignore tool
safety principles. A careless action can cause severe injury
within a fraction of a second.

Power tool use and care

▸ Do not force the power tool. Use the correct power
tool for your application. The correct power tool will do
the job better and safer at the rate for which it was designed.
▸ 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 repaired.
▸ Disconnect the plug from the power source and/or remove
the battery pack, if detachable, from the power
tool before making any adjustments, changing accessories,
or storing power tools. Such preventive
safety measures reduce the risk of starting the power tool
accidentally.
▸ Store idle power tools out of the reach of children and
do not allow persons unfamiliar with the power tool or
these instructions to operate the power tool. Power
tools are dangerous in the hands of untrained users.
▸ Maintain power tools and accessories.

Check for misalignment
or binding of moving parts, breakage of
parts and any other condition that may affect the
power tool’s operation. If damaged, have the power
tool repaired before use. Many accidents are caused by
poorly maintained power tools.
▸ Keep cutting tools sharp and clean. Properly maintained
cutting tools with sharp cutting edges are less
likely to bind and are easier to control.
▸ Use the power tool, accessories and tool bits etc. in
accordance with these instructions, taking into account
the working conditions and the work to be performed.

Use of the power tool for operations different
from those intended could result in a hazardous situation.

▸ Keep handles and grasping surfaces dry, clean and
free from oil and grease. Slippery handles and grasping
surfaces do not allow for safe handling and control of the
tool in unexpected situations.
Battery tool use and care
▸ Recharge only with the charger specified by the manufacturer.

A charger that is suitable for one type of battery
pack may create a risk of fire when used with another
battery pack.
▸ Use power tools only with specifically designated battery
packs. Use of any other battery packs may create a
risk of injury and fire.
▸ When battery pack is not in use, keep it away from
other metal objects, like paper clips, coins, keys,
nails, screws or other small metal objects, that can
make a connection from one terminal to another.
Shorting the battery terminals together may cause burns
or a fire.
▸ Under abusive conditions, liquid may be ejected from
the battery; avoid contact. If contact accidentally occurs,
flush with water. If liquid contacts eyes, additionally
seek medical help. Liquid ejected from the battery
may cause irritation or burns.
▸ Do not use a battery pack or tool that is damaged or
modified. Damaged or modified batteries may exhibit
unpredictable behaviour resulting in fire, explosion or risk
of injury.
▸ Do not expose a battery pack or tool to fire or excessive
temperature. Exposure to fire or temperature above
130°C may cause explosion.
▸ Follow all charging instructions and do not charge the
battery pack or tool outside the temperature range
specified in the instructions. Charging improperly or at
temperatures outside the specified range may damage
the battery and increase the risk of fire.

Service

▸ Have your power tool serviced by a qualified repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is maintained.
▸ Never service damaged battery packs. Service of battery
packs should only be performed by the manufacturer
or authorized service providers.

Safety information for the angle grinder

Safety warnings common for grinding or cutting-off
operations:

▸ This power tool is intended to function as a grinder or
cut-off tool. Read all safety warnings, instructions, illustrations
and specifications provided with this
power tool. Failure to follow all instructions listed below
may result in electric shock, fire and/or serious injury.
▸ Operations such as sanding, wire brushing, polishing
or hole cutting are not to be performed with this
power tool. Operations for which the power tool was not
designed may create a hazard and cause personal injury.
▸ Do not convert this power tool to operate in a way
which is not specifically designed and specified by the
tool manufacturer. Such a conversion may result in a
loss of control and cause serious personal injury.
▸ Do not use accessories which are not specifically designed
and specified by the tool manufacturer. Just
because the accessory can be attached to your power
tool, it does not assure safe operation.
▸ The rated speed of the accessory must be at least
equal to the maximum speed marked on the power
tool. Accessories running faster than their rated speed
can break and fly apart.
▸ The 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.
▸ The dimensions of the accessory mounting must fit
the dimensions of the mounting hardware of the
power tool. Accessories that do not match the mounting
hardware of the power tool will run out of balance, vibrate
excessively and may cause loss of control.
▸ Do not use a damaged accessory. Before each use inspect
the accessory such as abrasive wheels for chips
and cracks, backing 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 accessory, 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.
▸ Wear personal protective equipment. Depending on
application, use face shield, safety goggles or safety
glasses. As appropriate, wear dust mask, hearing protectors,
gloves and workshop apron capable of stopping
small abrasive or workpiece fragments. The eye
protection must be capable of stopping flying debris generated
by various applications. The dust mask or respirator
must be capable of filtrating particles generated by
the particular application. Prolonged exposure to high intensity
noise may cause hearing loss.
▸ Keep 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 accessory may fly away and cause injury beyond
immediate area of operation.
▸ Hold the power tool by insulated gripping surfaces
only, when performing an operation where the cutting
tool may contact hidden wiring. Contact with a “live”
wire will also make exposed metal parts of the power tool
“live” and could give the operator an electric shock.
▸ Never lay the power tool down until the accessory has
come to a complete stop. The spinning accessory may
grab the surface and pull the power tool out of your control.
▸ Do 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.
▸ Regularly clean the power tool’s air vents. The motor’s
fan will draw the dust inside the housing and excessive
accumulation of powdered metal may cause electrical
hazards.
▸ Do not operate the power tool near flammable materials.
Sparks could ignite these materials.
▸ Do not use accessories that require liquid coolants.
Using water or other liquid coolants may result in electrocution
or shock.

Kickback 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 accessory
which in turn causes the uncontrolled power tool to be
forced in the direction opposite 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 causing
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.
▸ Maintain a firm grip with both hands on the power tool
and position your body and arms 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 reactions or kickback forces, if proper precautions
are taken.
▸ Never place your hand near the rotating accessory.
Accessory may kickback over your hand.
▸ Do not position your body in the area where power
tool will move if kickback occurs. Kickback will propel
the tool in direction opposite to the wheel’s movement at
the point of snagging.
▸ Use special care when working corners, sharp edges,
etc. Avoid bouncing and snagging the accessory.
Corners, sharp edges or bouncing have a tendency to
snag the rotating accessory and cause loss of control or
kickback.
▸ Do not attach a saw chain woodcarving blade, segmented
diamond wheel with a peripheral gap greater
than 10 mm or toothed saw blade. Such blades create
frequent kickback and loss of control.
Safety warnings specific for grinding and cutting-off
operations:
▸ Use only wheel types that are specified for your power
tool and the specific guard designed for the selected
wheel. Wheels for which the power tool was not designed
cannot be adequately guarded and are unsafe.
▸ The grinding surface of centre depressed wheels must
be mounted below the plane of the guard lip. An improperly
mounted wheel that projects through the plane
of the guard lip cannot be adequately protected.
▸ The guard must be securely attached to the power tool
and positioned for maximum safety, so the least
amount of wheel is exposed towards the operator.
The guard helps to protect the operator from broken
wheel fragments, accidental contact with wheel and
sparks that could ignite clothing.
▸ Wheels must be used only for specified applications.
For example: do not grind with the side of cut-off
wheel. Abrasive cut-off wheels are intended for peripheral
grinding, side forces applied to these wheels may
cause them to shatter.
▸ Always use undamaged wheel flanges that are of correct
size and shape for your selected 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.
▸ Do not use worn down wheels from larger power tools.
A wheel intended for larger power tool is not suitable for
the higher speed of a smaller tool and may burst.
▸ When using dual purpose wheels always use the correct
guard for the application being performed. Failure
to use the correct guard may not provide the desired level
of guarding, which could lead to serious injury.

Additional safety warnings specific for cutting-off
operations:

▸ Do not “jam” the cut-off wheel or apply excessive
pressure. Do not attempt to make an excessive depth
of cut. Overstressing the wheel increases the loading
and susceptibility to twisting or binding of the wheel in
the cut and the possibility of kickback or wheel breakage.
▸ Do 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.
▸ When the wheel is binding or when interrupting a cut
for any reason, switch off the power tool and hold it
motionless until the wheel comes to a complete stop.
Never attempt to remove the cut-off wheel from the
cut while the wheel is in motion otherwise kickback
may occur. Investigate and take corrective action to eliminate
the cause of wheel binding.
▸ Do not restart the cutting operation in the workpiece.
Let the wheel reach full speed and carefully re-enter
the cut. The wheel may bind, walk up or kickback if the
power tool is restarted in the workpiece.
▸ Support panels or any oversized workpiece to minimize
the risk of wheel pinching and kickback. Large
workpieces tend to sag under 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.
▸ Use 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.
▸ Do not attempt to do curved cutting. Overstressing the
wheel increases the loading and susceptibility to twisting
or binding of the wheel in the cut and the possibility of
kickback or wheel breakage, which can lead to serious injury.

Additional safety information

Wear safety goggles.
The protective guard must not be used for
cutting. With a suitable adapter, the protective
guard can also be used for cutting.
▸ Use suitable detectors to determine if there are hidden
supply lines or contact the local utility company
for assistance. Contact with electric cables can cause
fire and electric shock. Damaging gas lines can lead to explosion.
Breaking water pipes causes property damage.
▸ Do not touch grinding and cutting discs until they have
cooled down. The discs can become very hot while working.
▸ Release the On/Off switch and set it to the Off position
when the power supply is interrupted, e.g. when
the battery pack is removed. This prevents uncontrolled
restarting.
▸ Secure the workpiece. A workpiece clamped with
clamping devices or in a vice is held more secure than by
hand.
▸ Remove the application tools before transporting the
power tool. This will allow you to avoid damage.
▸ Bonded cutting and grinding discs have an expiration
date, after which the discs must no longer be used.
▸ Store the application tools inside buildings, in a dry,
frost-free room at a uniform temperature.
▸ In case of damage and improper use of the battery, vapours
may be emitted. The battery can set alight or explode.
Ensure the area is well ventilated and seek medical
attention should you experience any adverse effects. The
vapours may irritate the respiratory system.
▸ Do not open the battery. There is a risk of short-circuiting.
▸ The battery can be damaged by pointed objects such
as nails or screwdrivers or by force applied externally.
An internal short circuit may occur, causing the battery to
burn, smoke, explode or overheat.
▸ Only use the battery with products from the manufacturer.
This is the only way in which you can protect the
battery against dangerous overload.
Protect the battery against heat, e.g. against
continuous intense sunlight, fire, dirt, water
and moisture. There is a risk of explosion and
short-circuiting.

Product Description and

Specifications

Read all the safety and general instructions.
Failure to observe the safety and general instructions
may result in electric shock, fire
and/or serious injury.
Please observe the illustrations at the beginning of this operating
manual.

Intended use

The power tool is intended for cutting metal, stone, plastics,
composite materials and wood, as well as for roughing metal
without the use of water. Make sure that the correct protective
guard is used (see “Operation”, page 21).

Product Features

The numbering of the product features refers to the diagram
of the power tool on the graphics page.
(1) Direction of rotation arrow on housing
(2) Spindle lock button
(3) On/off switch
(4) Rechargeable batterya)
(5) Rechargeable battery release buttona)
(6) Battery charge indicator
(7) Protective guard for grinding
(8) Grinding spindle
(9) Handle (insulated gripping surface)
(10) Protective guard for cutting
(11) Clamping bolt with washer
(12) Cutting disca)
(13) Hex key
a) Accessories shown or described are not included with the
product as standard. You can find the complete selection of
accessories in our accessories range.

Technical Data

Grinder GWS 12V-76
Article number 3 601 JF2 0..
Rated voltage V= 12
Rated no-load speedA) min–1 19,500
Max. grinding disc diameter mm 76
Mounting diameter mm 10
Weight according to EPTA-Procedure
01:2014B)
kg 0.70–0.90
Recommended ambient temperature
during charging
°C 0 to +35
Permitted ambient temperature
during operationC) and during storage
°C –20 to +50
Recommended rechargeable batteries
GBA 12V…
Recommended chargers GAL 12…
GAX 18…
A) Rated no-load speed for the selection of appropriate application
tools in accordance with EN IEC 62841-2-3. The actual no-load
speed must not exceed the rated no-load speed and is therefore
lower.
B) Depends on rechargeable battery (4) and protective guard ((7),
(10)) in use
C) Limited performance at temperatures < 0 °C
Values can vary depending upon the product and are subject to application
and environmental conditions. For further information
www.bosch-professional.com/wac.
Noise/Vibration Information
Noise emission values determined according to

EN IEC 62841-2-3.

Typically, the A-weighted sound pressure level of the power
tool is 78 dB(A). Uncertainty K = 3 dB. The noise level when
working can exceed the volume stated. Wear hearing protection!
Grinding thin metal sheets or other materials that tend to easily vibrate
with a large surface area can cause the noise emission value to
increase by up to 15 dB. Suitable, heavy damping mats can reduce
the increased noise emissions. Increased noise emissions must be
taken into consideration, both for the risk assessment of the noise
output and for selecting suitable hearing protection.
Vibration total values ah (triax vector sum) and uncertainty K
determined according to EN IEC 62841-2-3:
Surface grinding (roughing) and cut-off grinding:
ah = 13.5 m/s2, K = 1.5 m/s2.

The vibration level and noise emission value given in these
instructions have been measured in accordance with a
standardised measuring procedure and may be used to compare
power tools. They may also be used for a preliminary
estimation of vibration and noise emissions.
The stated vibration level and noise emission value represent
the main applications of the power tool. However, if the
power tool is used for other applications, with different accessories
or is poorly maintained, the vibration level and
noise emission value may differ. This may significantly increase
the vibration and noise emissions over the total working
period.

To estimate vibration and noise emissions accurately, the
times when the tool is switched off or when it is running but
not actually being used should also be taken into account.
This may significantly reduce vibration and noise emissions
over the total working period.
Implement additional safety measures to protect the operator
from the effects of vibration, such as servicing the
power tool and accessories, keeping their hands warm, and
organising workflows correctly.

Rechargeable battery

Bosch sells some cordless power tools without a rechargeable
battery. You can tell whether a rechargeable battery
is included with the power tool by looking at the packaging.

Charging the battery

▸ Use only the chargers listed in the technical data. Only
these chargers are matched to the lithium-ion battery of
your power tool.
Note: Lithium-ion rechargeable batteries are supplied partially
charged according to international transport regulations.
To ensure full rechargeable battery capacity, fully
charge the rechargeable battery before using your tool for
the first time.

Inserting the Battery
Push the charged battery into the battery holder until it
clicks into place.

Removing the Battery
To remove the rechargeable battery, press the battery release
buttons and pull the battery out. Do not use force to
do this.

Battery charge indicator
The three green LEDs on the battery charge indicator indicate
the state of charge of the rechargeable battery. The battery
charge indicator only lights up for three seconds after
start-up.
LED Capacity
3× continuous green light 60–100 %
2× continuous green light 30–60 %
1× continuous green light 5–30 %
1× flashing green light 0–5 %
Temperature-dependent overload protection
In normal conditions of use, the power tool cannot be overloaded.
If the power tool is overloaded or not kept within the
permitted battery temperature range, the speed is reduced
or the power tool switches off. At reduced speed, the power
tool will run again at full speed once the permitted battery
temperature is reached or the load is reduced. If it automatically
shuts down, switch the power tool off, allow the battery
to cool down, then switch the power tool back on.
Temperature monitoring/overload protection indicator
The red LED indicator helps you to protect the rechargeable
battery against overheating and the motor against overload.
If the LED indicator is lit up permanently in red, the temperature
of the rechargeable battery is too high and the power
tool switches off automatically.
– Switch the power tool off.
– Allow the battery to cool down before you carry on working.
If the LED indicator is flashing red, then the power tool is
blocked and will switch off automatically.
Pull the power tool out of the workpiece.
The power tool will continue to work as soon as the blockage
is rectified.
Recommendations for Optimal Handling of the
Battery
Protect the battery against moisture and water.
Only store the battery within a temperature range of −20 to
50 °C. Do not leave the battery in your car in the summer, for
example.
A significantly reduced operating time after charging indicates
that the battery has deteriorated and must be replaced.
Follow the instructions on correct disposal.
Fitting
Fitting Protective Equipment
▸ Remove the battery from the power tool before carrying
out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be removed
for transport and storage. There is risk of injury
from unintentionally pressing the on/off switch.

Note: If the grinding disc breaks during operation or the
holding fixtures on the protective guard/power tool become
damaged, the power tool must be sent to the after-sales service
immediately; see the “After-Sales Service and Application
Service” section for addresses.

Protective guard for grinding
▸ Always use the protective guard for grinding (7)
when grinding.
Protective guard for cutting
▸ When cutting, always use the protective guard for
cutting (10).
▸ Provide sufficient dust extraction when cutting stone.

Fitting the Protective Guard (see figure A)
Insert the protective guard for cutting (10) onto the protective
guard for grinding (7) until this engages firmly.
Adjusting the Protective Guard (see figure A)
Turn the protective guard to the required position and ensure
the protective guard is engaged. No tool is required for
this.
▸ Adjust the protective guard (7) such that sparking in
the direction of the operator is prevented.
Fitting the abrasive tools
▸ Remove the battery from the power tool before carrying
out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be removed
for transport and storage. There is risk of injury
from unintentionally pressing the on/off switch.
▸ Do not touch grinding and cutting discs until they have
cooled down. The discs can become very hot while working.
Clean the grinding spindle (8) and all parts to be mounted.
To tighten or loosen the abrasive tools, push the spindle lock
button (2) forwards and simultaneously turn the grinding
tool to fix the grinding spindle in place.
▸ Do not press the spindle lock button while the grinding
spindle is moving. The power tool may become damaged
if you do this.

Grinding/cutting disc
Pay attention to the dimensions of the abrasive tools. The
diameter of the hole must match that of the mounting flange.
Do not use an adapter or reducer.
When using diamond cutting discs, make sure that the direction
of rotation arrow on the diamond cutting disc corresponds
to the direction of rotation of the machine (see direction
of rotation arrow on the housing).
See the graphics page for fitting instructions.
Note: When assembling bonded grinding or cutting discs using
the supplied clamping bolt with washer (11), the use of
intermediate layers is not necessary.
To remove the grinding/cutting disc, push the spindle lock
button (2) forwards while simultaneously turning on the
grinding/cutting disc (12) in order to fix the grinding
spindle (8) in place (see figure B1).
Use a hex key (13) to remove the clamping bolt with
washer (11) and take off the grinding/cutting disc (12)
(see figure B2).
To attach the grinding/cutting disc, screw in the clamping
bolt with washer (11). Tighten the bolt using the hex
key (13) until the washer of the bolt is flush with the grinding/
cutting disc (12) (see figure B3).
Then push the spindle lock button (2) back again
(see figure B4).
▸ After fitting the abrasive tool, check that the abrasive
tool is fitted correctly and can turn freely before
switching on the power tool. Make sure that the abrasive
abrasive
tool does not brush against the protective guard or
other parts.

Approved Grinding Tools

You can use all the abrasive tools mentioned in these operating
instructions.
The permissible speed [min-1] or the circumferential speed
[m/s] of the abrasive tools used must at least match the values
given in the table.
It is therefore important to observe the permissible rotational/
circumferential speed on the label of the abrasive
tool.

Selecting the Grinding/Cutting Disc

Dust/Chip Extraction

Dust from materials such as lead-containing coatings, some
wood types, minerals and metal can be harmful to one’s
health. Touching or breathing-in the dust can cause allergic
reactions and/or lead to respiratory infections of the user or
bystanders.
Certain dust, such as oak or beech dust, is considered carcinogenic,
especially in connection with wood-treatment additives
(chromate, wood preservative). Materials containing
asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the materials
to be worked.
▸ Avoid dust accumulation at the workplace. Dust can
easily ignite.

Operation

Start-up
Switching on/off

To start the power tool, push the on/off switch (3) forward.
To lock the on/off switch (3) in position, push the on/off
switch (3) forward and down until it clicks into place.
To switch off the power tool, release the on/off switch (3);
or, if the switch is locked, briefly push the on/off switch (3)
backward and down and then release it.
▸ Always check abrasive tools before using them. The
abrasive tool must be fitted properly and be able to
move freely. Carry out a test run for at least one
minute with no load. Do not use abrasive tools that are
damaged, run untrue or vibrate during use. Damaged
abrasive tools can burst apart and cause injuries.

Practical advice

▸ Exercise caution when cutting slots in structural walls;
see the “Information on structural design” section.
▸ When cutting lightweight materials, take into account
the statutory provisions and recommendations of the
material manufacturer.
▸ Clamp the workpiece if it is not secure under its own
weight.
▸ Do not load the power tool so heavily that it comes to a
stop.
▸ If the power tool has been subjected to a heavy load,
continue to run it at no-load for several minutes to
cool down the accessory.
▸ Do not use the power tool with a cut-off stand.
▸ Do not touch grinding and cutting discs until they have
cooled down. The discs can become very hot while working.
If the power tool becomes electrostatically charged, the
built-in electronics will switch the power tool off. Press the
on/off switch (3) again to restart the power tool.

Rough grinding

▸ When rough grinding, always use the protective guard
for grinding (7).
▸ Never use cutting discs for rough grinding.
▸ When rough grinding, the protective guard for
cutting (10) can impact the workpiece and lead to a
loss of control.
The best rough grinding results are achieved with a set angle
of 30° to 40°. Move the power tool back and forth with moderate
pressure. This will ensure that the workpiece does not
become too hot or discolour and that grooves are not
formed.
▸ The protective guard for cutting (10) must be used when
using bonded discs which are approved for cutting and
grinding.

Cutting metal

▸ When cutting, always use the protective guard for
cutting (10). When using the protective guard for
grinding (7) for cutting work with bonded cutting discs,
there is an increased risk of being exposed to sparks,
particles and disc fragments if the disc breaks.
When carrying out abrasive cutting, use a moderate feed
that is suited to the material being machined. Do not exert
pressure on the cutting disc and do not tilt or swing the
power tool.
Do not attempt to reduce the speed of a cutting disc coming
to a stop by applying pressure from the side.
The power tool must always work in an up-grinding motion.
Otherwise there is a risk that it will be pushed uncontrolled
out of the cut.
For best results when cutting profiles and rectangular
tubing, start at the smallest cross section.

Cutting Stone

▸ When cutting, always use the protective guard for
cutting (10).
▸ Provide sufficient dust extraction when cutting stone.
▸ Wear a dust mask.
▸ The power tool may be used only for dry cutting/grinding.
For cutting stone, it is best to use a diamond cutting disc.
When cutting especially hard materials such as concrete
with a 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.
If this happens, stop cutting and allow the diamond cutting
disc to cool down by running the power tool for a short time
at maximum speed with no load.
If work is noticeably slower and circular sparking is present,
this indicates that the diamond cutting disc has become
blunt. You can resharpen the disc by briefly cutting into abrasive
material (e.g. lime-sand brick).

Cutting other materials

▸ For cutting materials such as plastic, composite materials,
etc. with bonded cutting discs or Carbide Multi
Wheel cutting discs, always use the protective guard
for cutting (10).
Information on structural design
Recesses in load-bearing walls are subject to country-specific
regulations. These regulations must be observed under
all circumstances. Seek advice from the responsible structural
engineer, architect or construction supervisor before
starting work.

Maintenance and Service

Maintenance and Cleaning

▸ Remove the battery from the power tool before carrying
out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be removed
for transport and storage. There is risk of injury
from unintentionally pressing the on/off switch.
▸ To ensure safe and efficient operation, always keep
the power tool and the ventilation slots clean.
Store and handle the accessories carefully.

After-Sales Service and Application Service
Our after-sales service responds to your questions concerning
maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com

The Bosch product use advice team will be happy to help you
with any questions about our products and their accessories.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.

Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ

At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
E-Mail: [email protected]
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses

Transport

The recommended lithium-ion batteries are subject to legislation
on the transport of dangerous goods. The user can
transport the batteries by road without further requirements.
When shipping by third parties (e.g.: by air transport or forwarding
agency), special requirements on packaging and labelling
must be observed. For preparation of the item being
shipped, consulting an expert for hazardous material is required.
Dispatch battery packs only when the housing is undamaged.
Tape or mask off open contacts and pack up the battery
in such a manner that it cannot move around in the
packaging. Please also observe the possibility of more detailed
national regulations.

Disposal

Power tools, rechargeable batteries, accessories
and packaging should be sorted for environmental-
friendly recycling.

Do not dispose of power tools and batteries/rechargeable
batteries into household waste!

Only for EU countries:

According to the Directive 2012/19/EU on waste electrical
and electronic equipment and its transposition into national
law, power tools that are no longer usable, and, according to
the Directive 2006/66/EC, defective or drained batteries
must be collected separately and disposed of in an environmentally
correct manner.

If disposed incorrectly, waste electrical and electronic
equipment may have harmful effects on the environment and
human health, due to the potential presence of hazardous
substances.

Only for United Kingdom:

According to The Waste Electrical and Electronic Equipment
Regulations 2013 (SI 2013/3113) (as amended) and the
Waste Batteries and Accumulators Regulations 2009 (SI
2009/890) (as amended), products that are no longer usable
must be collected separately and disposed of in an environmentally
friendly manner.

Battery packs/batteries:
Li-ion:
Please observe the notes in the section on transport (see
“Transport”, page 22).

Declaration of Conformity
Grinder Article number
GWS 12V-76 3 601 JF2 070
We declare under our sole responsibility that the stated products comply with all applicable provisions of the regulations listed
below and are in conformity with the following standards.
Technical file at: Robert Bosch Ltd. (PT/SOP-GB), Broadwater Park, North Orbital Road, Uxbridge UB9 5HJ, United Kingdom
The Supply of Machinery (Safety) Regulations 2008
The Electromagnetic Compatibility Regulations 2016
The Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment Regulations 2012
EN 62841-1:2015+A11:2022
EN IEC 62841-2-3:2021+A11:2021
EN 55014-1:2017+A11:2020
EN 55014-2:2015
EN IEC 63000:2018
Robert Bosch Power Tools GmbH, 70538 Stuttgart, Germany
represented (in terms of the above regulations) by
Robert Bosch Limited, Broadwater Park, North Orbital Road,
Uxbridge UB9 5HJ, United Kingdom
Vonjy Rajakoba
Managing Director – Bosch UK
Martin Sibley
Head of Sales Operations and Aftersales
Robert Bosch Ltd. Broadwater Park, North Orbital Road, Uxbridge UB9 5HJ, United Kingdom, as authorised