BOSCH GCM 350-254 Professional Sliding Mitre Saw Instruction Manual

: June 13, 2024
: Bosch

Table of Contents

GCM 350-254 Professional Sliding Mitre Saw
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GCM 350-254 Professional Sliding Mitre Saw

GCM 350-254 Professional

Robert Bosch Power Tools GmbH
70538 Stuttgart
GERMANY
www.bosch-pt.com

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 mainsoperated
(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 energizing
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.

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.

Safety Warnings for Mitre Saws

▶ Mitre saws are intended to cut wood or wood-like
products, they cannot be used with abrasive cut-off
wheels for cutting ferrous material such as bars, rods,
studs, etc. Abrasive dust causes moving parts such as
the lower guard to jam. Sparks from abrasive cutting will
burn the lower guard, the kerf insert and other plastic
parts.
▶ Use clamps to support the workpiece whenever possible.
If supporting the workpiece by hand, you must
always keep your hand at least 100 mm from either
side of the saw blade. Do not use this saw to cut pieces
that are too small to be securely clamped or held by
hand. If your hand is placed too close to the saw blade,
there is an increased risk of injury from blade contact.
▶ The workpiece must be stationary and clamped or
held against both the fence and the table. Do not feed
the workpiece into the blade or cut “freehand” in any
way. Unrestrained or moving workpieces could be thrown
at high speeds, causing injury.
▶ Push the saw through the workpiece. Do not pull the
saw through the workpiece. To make a cut, raise the
saw head and pull it out over the workpiece without
cutting, start the motor, press the saw head down and
push the saw through the workpiece. Cutting on the
pull stroke is likely to cause the saw blade to climb on top
of the workpiece and violently throw the blade assembly
towards the operator.
▶ Never cross your hand over the intended line of cutting
either in front or behind the saw blade. Supporting
the workpiece “cross handed” i.e. holding the workpiece
to the right of the saw blade with your left hand or vice
versa is very dangerous.
▶ Do not reach behind the fence with either hand closer
than 100 mm from either side of the saw blade, to remove
wood scraps, or for any other reason while the
blade is spinning. The proximity of the spinning saw
blade to your hand may not be obvious and you may be
seriously injured.
▶ Inspect your workpiece before cutting. If the workpiece
is bowed or warped, clamp it with the outside
bowed face toward the fence. Always make certain
that there is no gap between the workpiece, fence and
table along the line of the cut. Bent or warped workpieces
can twist or shift and may cause binding on the
spinning saw blade while cutting. There should be no nails
or foreign objects in the workpiece.
▶ Do not use the saw until the table is clear of all tools,
wood scraps, etc., except for the workpiece. Small
debris or loose pieces of wood or other objects that contact
the revolving blade can be thrown with high speed.
▶ Cut only one workpiece at a time. Stacked multiple
workpieces cannot be adequately clamped or braced and
may bind on the blade or shift during cutting.

▶ Ensure the mitre saw is mounted or placed on a level,
firm work surface before use. A level and firm work surface
reduces the risk of the mitre saw becoming unstable.
▶ Plan your work. Every time you change the bevel or
mitre angle setting, make sure the adjustable fence is
set correctly to support the workpiece and will not interfere
with the blade or the guarding system. Without
turning the tool “ON” and with no workpiece on the table,
move the saw blade through a complete simulated cut to
assure there will be no interference or danger of cutting
the fence.
▶ Provide adequate support such as table extensions,
saw horses, etc. for a workpiece that is wider or
longer than the table top. Workpieces longer or wider
than the mitre saw table can tip if not securely supported.
If the cut-off piece or workpiece tips, it can lift the lower
guard or be thrown by the spinning blade.
▶ Do not use another person as a substitute for a table
extension or as additional support. Unstable support
for the workpiece can cause the blade to bind or the
workpiece to shift during the cutting operation pulling you
and the helper into the spinning blade.
▶ The cut-off piece must not be jammed or pressed by
any means against the spinning saw blade. If confined,
i.e. using length stops, the cut-off piece could get wedged
against the blade and thrown violently.
▶ Always use a clamp or a fixture designed to properly
support round material such as rods or tubing. Rods
have a tendency to roll while being cut, causing the blade
to “bite” and pull the work with your hand into the blade.
▶ Let the blade reach full speed before contacting the
workpiece. This will reduce the risk of the workpiece being
thrown.
▶ If the workpiece or blade becomes jammed, turn the
mitre saw off. Wait for all moving parts to stop and
disconnect the plug from the power source and/or remove
the battery pack. Then work to free the jammed
material. Continued sawing with a jammed workpiece
could cause loss of control or damage to the mitre saw.
▶ After finishing the cut, release the switch, hold the
saw head down and wait for the blade to stop before
removing the cut-off piece. Reaching with your hand
near the coasting blade is dangerous.
▶ Hold the handle firmly when making an incomplete cut
or when releasing the switch before the saw head is
completely in the down position. The braking action of
the saw may cause the saw head to be suddenly pulled
downward, causing a risk of injury.
▶ Do not let go of the handle once the saw head has
reached the lowest position. Always guide the saw
head back to the top position by hand. There is a risk of
injury if the saw head moves in an uncontrolled manner.
▶ Keep your work area clean. Material mixtures are particularly
hazardous. Light metal dust may catch fire or explode.

▶ Do not use dull, cracked, bent or damaged saw blades.
Unsharpened or improperly set saw blades produce
narrow kerf causing excessive friction, blade binding
and kickback.
▶ Do not use saw blades made from high speed steel
(HSS). Such saw blades can easily break.
▶ Always use saw blades with correct size and shape
(diamond versus round) of arbour holes. Saw blades
that do not match the mounting hardware of the saw will
run off-centre, causing loss of control.
▶ Never remove cuttings, wood chips, etc. from the cutting
area while the power tool is running. Always guide
the tool arm back to the neutral position first and then
switch the power tool off.
▶ Do not touch the saw blade after working before it has
cooled. The saw blade becomes very hot while working.

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 fitted in its place by an authorized
customer service 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 inserted into a mains
socket elsewhere.

▶ Never make warning signs on the machine unrecognizable.
▶ Warning! If operating or adjustment devices other
than those specified here are used or other procedures
are carried out, this can lead to dangerous exposure
to radiation.
▶ Do not replace the integrated laser with a laser of another
type. A laser that is not compatible with this power
tool could pose a risk to persons.
▶ Do not make any modifications to the laser equipment.
The setting options described in these operating
instructions can be used safely.

Do not direct the laser beam at persons or
animals and do not stare into the direct or
reflected laser beam yourself. You could
blind somebody, cause accidents or damage your eyes.

Symbols

The following symbols may be important for the operation of
your power tool. Please take note of these symbols and their
meaning. Correctly interpreting the symbols will help you to
operate the power tool more effectively and safely.

Symbols and their meaning

Keep hands away from the cutting area
while the power tool is running. Contact
with the saw blade can lead to injuries.

Wear a dust mask.

Wear safety goggles.

Wear hearing protection. Exposure to
noise can cause hearing loss.

Danger area! Keep hands, fingers and
arms away from this area.

The table shows the recommended
speed setting depending on the material
to be worked: Aluminium, plastic, wood.
(Not available in all country-specific versions)

When sawing bevel angles or mitre
angles > 45°, the adjustable fences must
be pulled outwards or removed completely.

Take note of the dimensions of the saw
blade. The hole diameter must fit the tool
spindle without play. If it is necessary to
use reducers, ensure that the dimensions
of the reducer are suitable for the base
blade thickness and the saw blade hole
diameter, as well as the tool spindle diameter.
Wherever possible, use the reducers
provided with the saw blade.
The saw blade diameter must match the
information specified on the symbol.

Shows the rotational direction of the SDS
bolt for tightening the saw blade (anticlockwise)
and for loosening the saw blade (clockwise).

Symbols and their meaning

Clamping lever closed:
The adjusted bevel angle of the tool arm
is held in place.

Clamping lever open:
Bevel angles can be adjusted.

Direction of rotation of the spacer for the
slide device for sawing wide mouldings.

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 as a stationary machine for making
straight cuts in wood with and against the grain. It is possible
to cut mitre angles of -52° to +60° and bevel angles of
47° (to the left) to 47° (to the right).
The power tool is designed with sufficient capacity for sawing
hardwood and softwood as well as chipboard and fibreboard.
When using appropriate saw blades, sawing aluminium profiles
and plastic is also possible.
This product is a consumer laser product in accordance with
EN 50689.

Product Features

The numbering of the product features refers to the diagram
of the power tool on the graphics page.

(1) Fence
(2) Adjustable fence
(3) Standard 47°, 45°, 33.9° and 22.5° bevel angle
stops
(4) Scale for bevel angle
(5) Angle indicator for right-hand bevel angle range
(6) Locking screw for slide device
(7) Clamping lever for all bevel angles
(8) Speed regulatora)
(9) Transport safety lock
(10) Transport handle
(11) Protective guard
(12) Handle

(13) Locking lever
(14) Laser protection cap
(15) Retracting blade guard
(16) Guide roller
(17) Mounting holes
(18) Saw table
(19) Insert plate
(20) Locking clamp
(21) Locking knob for various mitre angles
(22) Mitre pre-setting lever
(23) Tilt protector
(24) Angle indicator for mitre angles
(25) Detents for standard mitre angles
(26) Scale for mitre angles
(27) Saw table extension
(28) Recessed handles
(29) Holes for screw clamp
(30) SDS bolt
(31) On/off switch
(32) On/off switch for laser (cutting line indication)
(33) Laser warning label
(34) Chip ejector
(35) Locking screw for the adjustable fence
(36) Slide device
(37) Hex key (6 mm/4 mm)
(38) Screw clamp
(39) Depth stop adjusting screw
(40) Depth stop
(41) Angle indicator for left-hand bevel angle range
(42) Stop for standard 0° bevel angle
(43) Chip deflector
(44) Spindle lock
(45) Hex socket screw for mounting the saw blade
(46) Clamping flange
(47) Saw blade
(48) Inner clamping flange
(49) Clamping screw for saw table extension
(50) Threaded rod
(51) Wing bolt
(52) Laser beam outlet aperture
(53) Vertical distance stop)
(54) Horizontal distance stop)
(55) Length stop)
(56) Locking screw for length stop)
(57) Clamping screw for length gauge)
(58) Screws for insert plate

(59) Set screw for laser positioning (right of the saw
blade)
(60) Hex key (2.5 mm)
(61) Set screw for laser positioning (left of the saw
blade)
(62) Screw for laser protection cap
(63) Fastening screw for laser mounting plate
(64) Fastening screw for laser housing
(65) Stop screw for 0° bevel angle

(66) Stop screw for left-hand bevel angle range
(67) Stop screw for right-hand bevel angle range
(68) Set screws for mitre angle scale
(69) Screw for mitre angle indicator
(70) Hook-and-loop strap
a) Not available in all country-specific versions.
b) 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

The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in countryspecific
models.
Permissible Workpiece Dimensions (see “Permissible workpiece dimensions”, page 39)
Values can vary depending upon the product and are subject to application and environmental conditions. For further information
www.bosch-professional.com/wac.

Noise Information

Noise emission values determined according to

EN IEC 62841-3-9.
Typically, the A-weighted noise level of the power tool is:
Sound pressure level 95 dB(A); sound power level
106 dB(A). Uncertainty K = 3 dB.

Wear hearing protection!
The noise emission value given in these instructions has
been measured in accordance with a standardized measuring
procedure and may be used to compare power tools. It
may also be used for a preliminary estimation of noise emissions.

The noise emission value given represents the main applications
of the power tool. However, if the power tool is used
for other applications, with different application tools or is
poorly maintained, the noise emission value may differ. This
may significantly increase noise emissions over the total
working period.

To estimate 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 noise emissions over the total working
period.

Assembly

▶ Avoid starting the power tool unintentionally. The
mains plug must not be connected to the power supply
during assembly or when carrying out any kind of
work on the power tool.

Items Included

See the list of items included at the start of the
operating manual.
Check to ensure that all the parts listed below have been
supplied before using the power tool for the first time:
– Sliding mitre saw with fitted saw blade (47)
– Screw clamp (38)
– Hex key (37)
– Hex key (60)
– SDS bolt (30)

Note: Check the power tool for possible damage.
Before continuing to use the power tool, carefully check that
all protective devices or slightly damaged parts are working
perfectly and according to specifications. Check that the
moving parts are working perfectly and without jamming;
check whether any parts are damaged. All parts must be fitted
correctly and all the conditions necessary to ensure
smooth operation must be met.
If the protective devices or any parts become damaged, you
must have them properly repaired or replaced by an authorized
service centre.

Extra tools required (not included in the delivery):

– Cross-headed screwdriver
– Ring spanner or open-ended spanner (size: 10 mm)

Stationary or flexible mounting

▶ To ensure safe handling, the power tool must be
mounted on a flat, stable work surface (e.g. work
bench) before use.
Mounting on a work surface (see figure A1−A2)
– Use suitable screw fasteners to secure the power tool to
the work surface. The holes (17) are used for this purpose. or
– Firmly clamp the base of the power tool to the work surface
with commercially available screw clamps.
Mounting on a Bosch saw stand
With the height-adjustable legs, Bosch GTA saw stands
provide firm support for the power tool on any surface. The
workpiece supports of the saw stand are used for underlaying
long workpieces.
▶ Read all the warnings and instructions included with
the saw stand. Failure to observe the warnings and follow
instructions may result in electric shock, fire and/or
serious injury.
▶ Assemble the saw stand properly before mounting the
power tool. Correct assembly is important to prevent the
risk of collapsing.
– Mount the power tool on the saw stand in the transport
position.

Flexible installation (not recommended) (see figure A3)

If, in exceptional circumstances, it is not possible to mount
the power tool on a flat and stable work surface, you can improvise
by setting it up with the tilt protector.
▶ Without the tilt protector, the power tool will not be
stable and can tip over especially when sawing maximum
mitre and/or bevel angles.
– Rotate the tilt protector (23) inwards or outwards until
the power tool is positioned straight on the work surface.

Dust/Chip Extraction

The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reactions
and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials containing
asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the material
wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
▶ Avoid dust accumulation at the workplace. Dust can
easily ignite.
The dust/chip extraction system can be blocked by dust,
chips or fragments of the workpiece.
– Switch the power tool off and pull the mains plug out of
the socket.
– Wait until the saw blade has come to a complete stop.
– Determine the cause of the blockage and eliminate it.
External dust extraction (see figure B)
You can also attach a dust extraction hose (35 mm diameter)
to the chip ejector (34) for extraction.
– Connect the dust extraction hose to the chip ejector (34).
The dust extractor must be suitable for the material being
worked.
When extracting dry dust that is especially detrimental to
health or carcinogenic, use a special dust extractor.

Changing the Saw Blade

▶ Pull the plug out of the socket before carrying out any
work on the power tool.
▶ Wear protective gloves when fitting the saw blade.
There is a risk of injury when touching the saw blade.
Only use saw blades that have a maximum permitted speed
higher than the no-load speed of the power tool.
Only use saw blades that match the specifications given in
this operating manual and that have been tested and marked
in accordance with EN 847-1.
Only use saw blades that are recommended by the power
tool manufacturer and are suitable for use on the material

you want to saw. This will prevent the saw teeth overheating
when sawing.
Assembly with hex socket screw (see figures C1−C3)
Removing the saw blade
– Bring the power tool into the work position.
– Press the locking lever (13), swing the retracting blade
guard (15) all the way back and release the locking lever
again.
Hold the retracting blade guard in this position.
– Turn the hex socket screw (45) with the hex key
(6 mm) (37) and at the same time push the spindle
lock (44) until it engages.
– Press and hold the spindle lock (44) and loosen the
screw (45) by turning it clockwise (left-hand thread).
– Remove the clamping flange (46).
– Remove the saw blade (47).
– Slowly push the retracting blade guard back down.
Fitting the saw blade
▶ When fitting the saw blade, make sure that the cutting
direction of the teeth (arrow direction on the saw
blade) matches the direction of the arrow on the protective
guard.
If required, clean all the parts you want to fit before installing
them.
– Press the locking lever (13), swing the retracting blade
guard (15) all the way back and release the locking lever
again.
Hold the retracting blade guard in this position.
– Place the new saw blade on the inner clamping
flange (48).
– Fit the clamping flange (46) and hex socket screw (45).
Press the spindle lock (44) until it engages and tighten
the hex socket screw by turning it anticlockwise.
– Slowly push the retracting blade guard (15) back down.
Assembly with SDS bolt (see figure D)
▶ For bevel cuts when using the SDS bolt (30), before
sawing, first make sure that the SDS bolt cannot come
into contact with the surface of the workpiece at any
time by making a suitable adjustment to the depth
stop (40). This prevents damage to the SDS bolt and/or
the workpiece.
Removing the saw blade
– Bring the power tool into the work position.
– Press the locking lever (13), swing the retracting blade
guard (15) all the way back and release the locking lever
again.
Hold the retracting blade guard in this position.
– Turn the SDS bolt (30) and simultaneously press the
spindle lock (44) until it engages.
– Press and hold the spindle lock (44) and unscrew the
SDS bolt (30) by turning it clockwise (left-hand thread).
– Remove the clamping flange (46).
– Remove the saw blade (47).
– Slowly push the retracting blade guard (15) back down.

Fitting the saw blade

▶ When fitting the saw blade, make sure that the cutting
direction of the teeth (arrow direction on the saw
blade) matches the direction of the arrow on the protective
guard.
If required, clean all the parts you want to fit before installing
them.
– Press the locking lever (13), swing the retracting blade
guard (15) all the way back and release the locking lever
again.
Hold the retracting blade guard in this position.
– Place the new saw blade on the inner clamping
flange (48).
– Fit the clamping flange (46) and the SDS bolt (30). Press
the spindle lock (44) until it engages and tighten the SDS
bolt by turning it anticlockwise.
– Slowly push the retracting blade guard (15) back down.

Operation

▶ Pull the plug out of the socket before carrying out any
work on the power tool.
Transport Safety Lock (see figure E)
The transport safety lock (9) makes it easier to handle the
power tool when transporting it to various working locations.
Unlocking the power tool (work position)
– Press the tool arm down slightly by the handle (12) to release
the transport safety lock (9).
– Pull the transport safety lock (9) all the way out.
– Slowly guide the tool arm upwards.
Locking the power tool (transport position)
– Loosen the locking screw (6) if it is clamping the slide
device (36) in place. Pull the tool arm fully forward and
tighten the locking screw again to lock the slide device.
– Screw the adjusting screw (39) all the way upwards.
– To lock the saw table (18) in place, tighten the locking
knob (21).
– Press the locking lever (13) and slowly guide the tool arm
downwards using the handle (12).
– Guide the tool arm downwards until you can press the
transport safety lock (9) all the way in.
The tool arm is now securely locked and ready for transportation.

Preparing for operation

Extending the saw table (see figure F)
The free end of long workpieces must have something
placed underneath it or be supported.
The saw table can be extended left and right using the saw
table extensions (27).
– Loosen the clamping screw (49).
– Pull out the saw table extension (27) to the required
length.

– Retighten the clamping screw (49) to fix the saw table extension.

Moving the fence (see figure G)

When sawing mitre and/or bevel angles, you have to pull the
left-hand or right-hand adjustable fence (2) outwards depending
on the cutting direction, or remove it completely.

If necessary, reinstall the adjustable fence (2) after making
the cut.

Vertical bevel angle range

–2° to +40° Left – Loosen the locking screw (35).
–2° to +35° Right – Pull the adjustable fence (2) all the way out.

40° Left – Loosen the locking screw (35).
– Pull the adjustable fence (2) all the way out.
– Lift the adjustable fence upwards and out of the way.
35° Right

Horizontal bevel angle range

45° Left – Loosen the locking screw (35).
Right – Pull the adjustable fence (2) all the way out.

Clamping the workpiece (see figure H)

To ensure maximum safety while working, the workpiece
must always be firmly clamped.
Do not saw workpieces that are too small to clamp firmly.
– Press the workpiece firmly against the fences (1) and (2).
– Insert the supplied screw clamp (38) into one of the corresponding
holes (29).
– Loosen the wing bolt and adjust the screw clamp to the
workpiece. Tighten the wing bolt again.
– Tighten the threaded rod (50) to fix the workpiece in
place

Releasing the workpiece
– To loosen the screw clamp, turn the threaded rod (50)
anticlockwise.

Adjusting mitre angles

To ensure precise cuts, the basic settings of the power tool
must be checked and adjusted as necessary after intensive use.
Experience and suitable special tools are required for this.
A Bosch after-sales service point will handle this work
quickly and reliably.
Note for adjusting mitre angles > 45°:
Before adjusting the mitre angle, pull the saw table
extension (27) and the adjustable fence (2) all the way out.
Setting Standard Mitre Angles (see figure I1)
For quick and precise setting of commonly used mitre
angles, detents (25) are provided on the saw table:

Leftward Rightward
0°
45°; 31.6°; 22.5°; 15° 15°; 22.5°; 31.6°; 45°; 60°

– Loosen the locking knob (21) if it is tightened.
– Pull the lever (22) and rotate the saw table (18) left or
right to the required detent.

– Release the lever again. The lever must be felt to engage
in the detent.
– Retighten the locking knob (21).
Setting Any Mitre Angle (see figure I2)
The mitre angle can be set between 52° (left side) and 60°
(right side).
– Loosen the locking knob (21) if it is tightened.
– Pull the lever (22) and at the same time press the locking
clamp (20) until this clicks into the slot provided for it.
This means the saw table can now move freely.
– Turn the saw table (18) left or right by the locking knob
until the angle indicator (24) shows the required mitre
angle.
– Retighten the locking knob (21).
– To loosen the lever (22) again (for setting standard mitre
angles), pull the lever upwards.
The locking clamp (20) springs back into its original position
and the lever (22) can click back into the detents
(25).

Adjusting bevel angles

To ensure precise cuts, the basic settings of the power tool
must be checked and adjusted as necessary after intensive
use.
Experience and suitable special tools are required for this.
A Bosch after-sales service point will handle this work
quickly and reliably.
The bevel angle can be set between 47° (left side) and 47°
(right side).
For quick and precise setting of frequently used bevel
angles, stops have been provided for the angles 0°, 47°, 45°,
33.9° and 22.5°.
▶ For bevel cuts when using the SDS bolt (30), before
sawing, first make sure that the SDS bolt cannot come
into contact with the surface of the workpiece at any

time by making a suitable adjustment to the depth
stop (40). This prevents damage to the SDS bolt and/or
the workpiece.
Setting the left bevel angle range (see figure J1)
– Pull the left-hand adjustable fence (2) all the way out.
– Loosen the clamping lever (7).
– Use the handle (12) to swivel the tool arm to the left until
the angle indicator (41) shows the required bevel angle.
– Re-tighten the clamping lever (7).
Setting the complete bevel angle range (see figure J2)
– Swing the stop (42) all the way out.
This enables you to use the complete mitre angle range
(left and right).
– Pull the right-hand adjustable fence (2) all the way out or
remove it completely.
If you want to use the entire bevel angle range, you also
have to pull the left-hand adjustable fence (2) all the way
out or remove it completely.
– Loosen the clamping lever (7).
– Swing the tool arm left or right by the handle (12) until
the angle indicator (41)/(5) shows the required bevel
angle.
– Re-tighten the clamping lever (7).
Setting standard bevel angles (see figure J3)
– Loosen the clamping lever (7).
– Standard 0° bevel angles:
Swing the tool arm by the handle (12) slightly to the left
and swing the stop (42) all the way in.
Standard 47°, 45°, 33.9° and 22.5° bevel angles:
Turn the stop (3) until the required standard bevel angle
engages at the arrow mark.
– Re-tighten the clamping lever (7).

Start-up

▶ Products that are only sold in AUS and NZ: Use a residual
current device (RCD) with a nominal residual current
of 30 mA or less.
▶ Pay attention to the mains voltage. The voltage of the
power source must match the voltage specified on the
rating plate of the power tool.

Switching on (see figure K)
– To start the tool, press the on/off switch (31) and keep it
pressed.
Note: For safety reasons, the on/off switch (31) cannot be
locked; it must remain pressed during the entire operation.
Only by pressing the locking lever (13) can the tool arm be
guided downwards.
– For sawing, you must therefore press the locking
lever (13) in addition to pressing the On/Off switch (31).

Switching off
– To switch off, release the on/off switch (31).

Starting current limitation
The electronic starting current limitation feature restricts the
power of the power tool when it is switched on and enables
operation using a 16 A fuse.
Note: If the power tool runs at full speed immediately after
being switched on, this means that the starting current limitation
has failed. The power tool must be sent to the aftersales
service without delay.

Sawing

General sawing instructions
▶ Always tighten the locking knob (21) and the clamping
lever (7) firmly before sawing. Otherwise the saw
blade can become wedged in the workpiece.
▶ For all cuts, it must first be ensured that the saw blade
at no time can come in contact with the fence, screw
clamps or other machine parts. Remove any mounted
auxiliary stops or adjust them accordingly.
Protect the saw blade against impact and shock. Do not subject
the saw blade to lateral pressure.
Only saw materials which are permitted within the scope of
the intended use.
Do not saw warped/bent workpieces. The workpiece must
always have a straight edge to face against the fence.
The free end of long and heavy workpieces must have something
placed underneath it or be supported.
Make sure that the retracting blade guard operates properly
and that it can move freely. The retracting blade guard must
open when the tool arm is guided downwards. When the tool
arm is guided upwards, the retracting blade guard must
close again over the saw blade and lock in the uppermost position
of the tool arm.

Adjusting the Speed (not available in all country-specific versions)
The speed regulator (8) enables continuously variable adjustment
of the speed of the power tool even during operation.
Note: Always set the suitable speed for the workpiece material
(see table below). This will prevent the saw teeth overheating
when sawing.

Speed setting Material
1 Aluminium
2
3 Plastics
4
5 Wood
6
Position of the operator (see figure L)
▶ Do not stand in line with the saw blade in front of the
power tool. Always stand to the side of the saw blade.
This protects your body against possible kickback.
– Keep hands, fingers and arms away from the rotating saw
blade.

– Do not reach one hand across the other when in front of
the tool arm.

Sawing with slide movement

– For cuts made using the slide device (36) (wide workpieces),
loosen the locking screw (6) if it is tightened.
– Set the required mitre and/or bevel angle as necessary.
– Press the workpiece firmly against the (2) and (1) fences.
– Firmly clamp the workpiece as appropriate for its dimensions.
– Pull the tool arm away from the (2) and (1) fences until
the saw blade is in front of the workpiece.
– Switch on the power tool.
– Press the locking lever (13) and slowly guide the tool arm
downwards using the handle (12).
– Now push the tool arm towards the (2) and (1) fences
and saw through the workpiece applying uniform feed.
– Switch off the power tool and wait until the saw blade has
come to a complete stop.
– Slowly guide the tool arm upwards.

Sawing without slide movement (cutting off) (see figure M)

– For cuts without slide movement (small workpieces),
loosen the locking screw (6) if it is tightened. Push the
tool arm all the way towards the (2) and (1) fences and
re-tighten the locking screw (6).
– Set the required mitre and/or bevel angle as necessary.
– Press the workpiece firmly against the (2) and (1) fences.
– Firmly clamp the workpiece as appropriate for its dimensions.
– Switch on the power tool.
– Press the locking lever (13) and slowly guide the tool arm
downwards using the handle (12).
– Saw through the workpiece applying uniform feed.
– Switch off the power tool and wait until the saw blade has
come to a complete stop.
– Slowly guide the tool arm upwards.

Practical advice

Marking the cutting line (see figure N)
Two laser beams indicate the cutting width of the saw blade.
This allows for exact positioning of the workpiece for sawing,
without having to open the retracting blade guard.
– Switch on the laser beams with the switch (32).
– Position your mark on the workpiece between the two
laser lines.
Note: Before sawing, check if the cutting width is still indicated
correctly Adjusting the Laser. Vibrations during intensive
use, for example, can cause the laser beams to become
misaligned.

Permissible workpiece dimensions
Maximum workpiece dimensions:

Mitre angle Bevel angle Height x width
[mm] 0° 0° 89 x 320
100 x 250A)
60 x 350
45° 0° 89 x 226B)
0° 45° (left) 50 x 320
0° 45° (right) 30 x 320
45° 45° (left) 50 x 226
45° 45° (right) 30 x 226

A) With vertical distance stop (53) (see figure O)
B) With horizontal distance stop (54) (see figure O)
Minimum workpiece dimensions (= all workpieces that can
be secured left or right of the saw blade using the supplied
screw clamps (38)):
100 mm x 100 mm (length x width)
Maximum cutting depth (0°/0°):
– 89 mm
– 100 mm (with vertical distance stop (53))
Maximum cutting width (0°/0°):
– 320 mm
– 350 mm (with horizontal distance stop (54))

Adjusting the Depth Stop (Sawing the Groove)
(see figure P)
The depth stop needs to be adjusted if you wish to saw a
groove.
– Swing the depth stop (40) forwards.
– Press the locking lever (13) and swing the tool arm into
the required position.
– Turn the adjusting screw (39) until the end of the screw
touches the depth stop (40).
– Slowly guide the tool arm upwards.

Sawing workpieces of the same length (see figure Q)
The length stop (55) (accessory) can be used for easily sawing
workpieces of the same length.
The length stop can be mounted on either side of the saw
table extension (27).
– Loosen the locking screw (56) and move the length
stop (55) over the clamping screw (57).
– Re-tighten the locking screw (56).
– Set the saw table extension (27) to the required length.

Special workpieces
When sawing curved or round workpieces, these must be especially
secured against slipping. At the cutting line, there
should be no gap between the workpiece, fence and saw
table.
If necessary, you will need to manufacture special fixtures.

Replacing insert plates (see figure R)
The red insert plates (19) can become worn after prolonged
use of the power tool.
Replace faulty insert plates.

– Bring the power tool into the work position.
– Loosen the screws (58) using the hex key (6 mm) (37)
and remove the old insert plates.
– Insert the new right-hand insert plate.
– Screw the insert plate as far as possible to the right with
the screws (58) so that the saw blade does not come into
contact with the insert plate over the entire length of the
possible slide motion.
– Repeat the work steps in the same manner for the new
left-hand insert plate.

Adjusting the laser
Note: To test the laser function, the power tool must be connected
to the power supply.
u While adjusting the laser (e.g. when moving the tool
arm), never activate the on/off switch. Starting the
power tool accidentally can lead to injuries.
– Bring the power tool into the work position.
– Turn the saw table (18) to the 0° detent (25). The lever
(22) must be felt to engage in the detent.
Checking (see figure S1)
– Draw a straight cutting line on the workpiece.
– Press the locking lever (13) and slowly guide the tool arm
downwards using the handle (12).
– Position the workpiece so that the teeth of the saw blade
line up with the cutting line.
– Hold the workpiece in this position and slowly guide the
tool arm back up.
– Clamp the workpiece.
– Switch on the laser beams with the switch (32).
The laser beams must be at the same distance from the
marked cutting line on the workpiece left and right along the
entire length, even if the tool arm is being guided downwards.
Adjusting the flush alignment (see figure S2)

1. Adjusting the right-hand laser beam:
– Turn the set screw (59) with the hex key (60) until the
right-hand laser beam is flush with the marked cutting line
on the workpiece along the entire length.
This also moves the left-hand laser beam.
One rotation anticlockwise moves the laser beam from left to
right; one rotation clockwise moves the laser beam from
right to left.

2. Adjusting the left-hand laser beam:
– Turn the set screw (61) with the hex key (60) until the
left-hand laser beam is at the same distance from the
marked cutting line on the workpiece as the right-hand
laser beam.
One rotation anticlockwise moves the laser beam from left to
right; one rotation clockwise moves the laser beam from
right to left.

Adjusting the parallelism (see figure S3)
– Remove the four screws (62) from the laser protection
cap (14) with a cross-headed screwdriver.

Adjusting the lateral deviation when moving the tool arm
(see figure S4)
– Remove the four screws (62) from the laser protection
cap (14) with a cross-headed screwdriver.
Note: To reach the front screws of the laser protection
cap, you must swing the retracting blade guard (15)
backwards.
– Loosen the two fastening screws (64) (by approx. 1–2
turns) using the hex key (60).
Do not completely unscrew the screws.
– Move the laser housing right or left until the laser beams
no longer laterally deviate when the tool arm moves
downwards.
– Check the flush alignment with the cutting line again following
adjustment. If necessary, align the laser beams
with the set screws (59)/(61) once more.
– Hold the laser housing in this position and retighten the
fastening screws (64).
– Reattach the laser protection cap (14).

Checking and Adjusting the Basic Settings
To ensure precise cuts, the basic settings of the power tool
must be checked and adjusted as necessary after intensive
use.

Experience and suitable special tools are required for this.
A Bosch after-sales service point will handle this work
quickly and reliably.

Setting the Standard 0° Bevel Angle
– Bring the power tool into the transport position.
– Turn the saw table (18) to the 0° detent (25). The lever
(22) must be felt to engage in the detent.
Checking (see figure T1)
– Set an angle gauge to 90° and place it on the saw table
(18).
The leg of the angle gauge must be flush with the saw blade
(47) along its entire length.

Setting (see figure T2)
– Loosen the clamping lever (7).
– Swing the stop (42) all the way in.

– Loosen the lock nut of the stop screw (65) with a commercially
available ring or open-ended spanner (10 mm).
– Turn the stop screw as far in or out as needed until the leg
of the angle gauge is flush with the saw blade along its entire
length.
– Re-tighten the clamping lever (7).
– Then re-tighten the lock nut of the stop screw (65).
If the angle indicators (41) and (5) are not in line with the 0°
marks on the scale (4) following adjustment, loosen the
fastening screws on the angle indicators using a crossheaded
screwdriver and align the angle indicators with the
0° marks.
Setting the Standard 45° Mitre Angle (left)
– Bring the power tool into the work position.
– Turn the saw table (18) to the 0° detent (25). The
lever (22) must be felt to engage in the detent.
– Remove the left-hand adjustable fence (2)
– Turn the left-hand stop (3) until the standard 45° mitre
angle engages at the arrow mark.
– Loosen the clamping lever (7).
– Swivel the tool arm by the handle (12) to the left until the
stop screw (66) rests on the stop (3).

Checking (see figure U1)
– Set an angle gauge to 45° and place it on the saw table
(18).
The leg of the angle gauge must be flush with the saw blade
(47) along its entire length.
Setting (see figure U2)
– Loosen the lock nut of the stop screw (66) using a commercially
available box-ended or open-ended spanner
(size 10 mm).
– Turn the stop screw (66) as far in or out as needed until
the leg of the angle gauge is flush with the saw blade along
its entire length.
– Retighten the clamping lever (7).
– Then retighten the lock nut of the stop screw (66).
If the angle indicators (41) and (5) are not in line with the
45° marks on the scale (4) following adjustment, first check
the 0° setting for the bevel angle and the angle indicators
once more. Then repeat the adjustment of the 45° bevel
angle.

Setting the Standard 45° Mitre Angle (right)
– Bring the power tool into the work position.
– Turn the saw table (18) to the 0° detent (25). The lever
(22) must be felt to engage in the detent.
– Remove the right adjustable fence (2).
– Swing the stop (42) all the way out
– Turn the right stop (3) until the standard 45° bevel angle
engages at the arrow mark.
– Loosen the clamping lever (7).
– Swing the tool arm left by the handle (12) until the stop
screw (67) lies on the stop (3).

Checking (see figure V1)
– Set an angle gauge to 135° and place it on the saw table
(18).
The leg of the angle gauge must be flush with the saw blade
(47) along its entire length.
Setting (see figure V2)
– Loosen the lock nut of the stop screw (67) with a commercially
available ring or open-ended spanner (10 mm).
– Turn the stop screw (67) as far in or out as needed until
the leg of the angle gauge is flush with the saw blade along
its entire length.
– Re-tighten the clamping lever (7).
– Then re-tighten the lock nut of the stop screw (67).
If the angle indicators (41) and (5) are not in line with the
45° marks on the scale (4) following adjustment, first check
the 0° setting for the bevel angle and the angle indicators
once more. Then repeat the adjustment of the 45° bevel
angle.

Aligning the scale for mitre angles

– Bring the power tool into the work position.
– Turn the saw table (18) to the 0° detent (25). The lever
(22) must be felt to engage in the detent.
Checking (see figure W1)
– Set an angle gauge to 90° and position it between the
fence (1) and the saw blade (47) on the saw table (18).
The leg of the angle gauge must be flush with the saw blade
(47) along its entire length.
Setting (see figure W2)
– Loosen all four set screws (68) using the hex key (4 mm)
(37) and turn the saw table (18) together with the scale
(26) until the leg of the angle gauge is flush with the saw
blade along its entire length.
– Re-tighten the screws again.
If the angle indicator (24) is not aligned with the 0° mark on
the scale (26) following adjustment, loosen the screw (69)
using a cross-headed screwdriver and align the angle indicator
along the 0° mark.

Transport (see figure X)

Before transporting the power tool, the following steps must
be carried out:
– Loosen the locking screw (6) if it is tightened. Pull the
tool arm fully forwards and retighten the locking screw.
– Ensure that the depth stop (40) is swung all the way back
and the adjusting screw (39) fits through the recess
without touching the depth stop when you move the tool arm.
– Push the saw table extensions all the way in and fix them there.
– Bring the power tool into the transport position.
– Remove all accessories that cannot be securely fitted to the power tool.
– If possible, transport unused saw blades in an enclosed container.

– Tie the power cable and hook-and-loop strap (70) together.
– Carry the power tool by the transport handle (10) or
grasp the recessed handles (28) on the side of the saw
table
▶ Only use the transport devices to transport the power
tool and never the protective devices.
Maintenance and Service
Maintenance and Cleaning
▶ Pull the plug out of the socket before carrying out any
work on the power tool.
▶ To ensure safe and efficient operation, always keep
the power tool and the ventilation slots clean.
In order to avoid safety hazards, if the power supply cord
needs to be replaced, this must be done by Bosch or by an
after-sales service centre that is authorised to repair Bosch
power tools.

The retracting blade guard must always be able to move
freely and retract automatically. It is therefore important to
keep the area around the retracting blade guard clean at all
times.

Always remove dust and chips after working by blowing out
with compressed air or using a brush.
Clean the guide roller (16) regularly.
Noise reduction measures

Measures implemented by the manufacturer:
– Soft start
– Provided with a saw blade specially developed for noise
reduction

Measures implemented by the operator:
– Low-vibration mounting on a stable work surface
– Use of saw blades with noise-reducing functions
– Regular cleaning of the saw blade and power tool

After-Sales Service and Application Service

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

Tel. Service: (0344) 7360109
E-Mail: boschservicecentre@bosch.com
Weitere Serviceadressen finden Sie unter:
www.bosch-pt.com/serviceaddresses

Disposal

The power tool, accessories and packaging should be recycled
in an environmentally friendly manner.
Do not dispose of power tools along with
household waste.

Only for EU countries:
According to the European Directive 2012/19/EU on Waste
Electrical and Electronic Equipment and its implementation
into national law, power tools that are no longer usable must
be collected separately and disposed of in an environmentally
friendly 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), products
that are no longer usable must be collected separately and
disposed of in an environmentally friendly manner.

Declaration of Conformity

Sliding mitre saw Article number
GCM 350-254 3 601 M22 660

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 62841-3-9:2020+A11:2020
EN IEC 55014-1:2021
EN IEC 55014-2:2021
EN IEC 61000-3-2:2019+A1:2021
EN 61000-3-3:2013+A1:2019+A2:2021
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