Bosch Gcm 10 J Manual

							 English | 29
Bosch Power Tools 1 609 929 W04 | (11/2/10)
Functional Description
Read all safety warnings and all in-
structions. Failure to follow the 
warnings and instructions may re-
sult in electric shock, fire and/or se-
rious injury.
Intended Use
The power tool is intend ed as a stationary ma-
chine for making straight lengthways and cross-
ways cuts. In this, mitre angles from – 47 °  to 
+47 °  as well as bevel angles from –2 °  to 47 °  are 
possible.
The capacity of the power tool is designed for 
sawing hardwood, softwood, particle and fibre-
board, as well as aluminium and plastic.
Product Features
The numbering of the components shown refers 
to the representation of the power tool on the 
graphic pages.
1 Lever for releasing the tool arm
2 Handle
3 On/Off switch
4 Retracting blade guard
5 Fence
6 Saw table
7 Insert plate
8 Locking knob for various mitre angles 
(horizontal)
9 Lever for mitre angle adjustment 
(horizontal)
10 Angle indicator (horizontal)
11 Detents for standard mitre angles
12 Scale for mitre angle (horizontal)
f
Wear safety goggles.
f Wear ear protectors.  Exposure to noise can cause hearing loss.
f Danger area! Keep hands, finger s or arms away from this area.
Observe the dimensions of the saw blade. The hole diameter must 
match the tool spindle without play. Do not use reducers or adapters.
f Danger area! Keep hands, finger s or arms away from this area.
SymbolMeaning
254 mm30 mm
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1 609 929 W04 | (11/2/10)Bosch Power Tools
13Mounting holes
14 Drill holes for material clamp
15 Recessed grips
16 Drill holes for extension bars
17 Material clamp
18 Stop screw for 45 °  bevel angle (vertical)
19 Clamping lever for various bevel angles 
(vertical)
20 Roller
21 Dust bag
22 Blade guard
23 Transport handle
24 Transport safety-lock
25 Sawdust ejector
26 Metal bar of tilt protector
27 Stop screw for 0 °  bevel angle (vertical)
28 Allen key (size 6 mm)/Phillips screwdriver
29 Allen screws (6 mm) of the fence
30 Holes for metal bar of tilt protector 31
Fastening screw for metal bar of tilt protec-
tor
32 Phillips screw
33 Spindle lock 
34 Allen screw (size 6 mm) for mounting of saw 
blade 
35 Clamping flange
36 Saw blade
37 Tool spindle
38 Extension bar
39 Wing bolt
40 Threaded rod
41 Angle indicator (vertical)
42 Screws for insert plate
43 Screw for angle indicator (horizontal)
44 Scale for bevel angle (vertical)
45 Screw for angle indicator (vertical)
Accessories shown or described are not part of the 
standard delivery scope of the product. A complete 
overview of accessories can be found in our acces-
sories program.
Technical Data
Chop and Mitre SawGCM 10 J Professional
Article number 3 601 M20 ...
... 200... 230 ... 260... 270
Rated power input
W 20002000 16002000
Rated voltage
V 230230 110230
Frequency
Hz 50/6050/60 50/6050/60
No-load speed
min-145004500 45004500
Weight according to 
EPTA-Procedure 01/2003
kg 14.514.5 14.514.5
Protection class
/ II/II /II/ II
Permissible workpiece dimensions  (maximal/minimal) see page 36.
The values given are valid for nominal voltages [U] of 230/240 V. For lower voltage and models for specific countries, 
these values can vary.
Please observe the article number on the type plate of your machine. The trade names of the individual machines may 
vary.
Dimension of suitable saw blades
Saw blade diameter
mm 254
Blade thickness
mm 1.4 – 2.5
Mounting hole diameter
mm 30
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							 English | 31
Bosch Power Tools 1 609 929 W04 | (11/2/10)
Noise/Vibration Information
Measured sound values determined according 
to EN 61029.
Typically the A-weighted noise levels of the 
product are: Sound pressure level 102 dB(A); 
Sound power level 115 dB(A). Uncertainty 
K=3 dB.
Wear hearing protection!
Vibration total values (triax vector sum) deter-
mined according to EN 61029:
Vibration emission value a
h=3.0 m/s2, Uncer-
tainty K = 1.5 m/s2.
The vibration emission level given in this infor-
mation sheet has been measured in accordance 
with a standardised test given in EN 61029 and 
may be used to compare one tool with another. 
It may be used for a preliminary assessment of 
exposure.
The declared vibration emission level repre-
sents the main applications of the tool. However 
if the tool is used for different applications, with 
different accessories or poorly maintained, the 
vibration emission may differ. This may signifi-
cantly increase the exposure level over the total 
working period.
An estimation of the level of exposure to vibra-
tion should also take into account the times 
when the tool is switched off or when it is run-
ning but not actually doin g the job. This may sig-
nificantly reduce the exposure level over the to-
tal working period.
Identify additional safety measures to protect 
the operator from the effects of vibration such 
as: maintain the tool and the accessories, keep 
the hands warm, organisation of work patterns. 
Declaration of Conformity
We declare under our sole responsibility that 
the product described under “Technical Data” is 
in conformity with the following standards or 
standardization documents: EN 61029 accord-
ing to the provisions of the directives 
2004/108/EC, 2006/42/EC. Technical file at:
Robert Bosch GmbH, Dept. PT/ESC, 
D-70745 Leinfelden-Echterdingen
Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
Leinfelden, 11.02.2010
Assembly
f
Avoid unintentional starting of the ma-
chine. During assembly and for all work on 
the machine, the power plug must not be 
connected to the mains supply.
Delivery Scope
Before starting the operation of the machine for 
the first time, check if all parts listed below have 
been supplied:
– Chop and mitre saw with mounted saw blade
– Metal bar of tilt protector  26 with fastening 
screw  31
– Locking knob  8
– Dust bag  21
– Material clamp  17
– Allen key/Phillips screwdriver  28
Note:  Check the power tool for possible dam-
age.
Before further use of the machine, check that all 
protective devices are fully functional. Any light-
ly damaged parts must be carefully checked to 
ensure flawless operation of the tool. All parts 
must be properly mounted and all conditions 
fulfilled that ensure faultless operation.
Damaged protective devices and parts must be 
immediately replaced by an authorised service 
centre.
Dr. Egbert Schneider
Senior Vice President
Engineering Dr. Eckerhard Strötgen
Head of Product
Certification
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1 609 929 W04 | (11/2/10)Bosch Power Tools
Mounting Individual Components
– Carefully remove all parts provided from 
their packaging.
Remove all packing material from the power 
tool and the accessories provided.
Mounting the Tilt-guard (see figure A)
Before using the power tool for the first time, 
the metal bar of the tilt protector  26 must be 
mounted.
– Insert the metal bar of tilt protector  26 into 
the drill holes  30 of base plate intended for 
this purpose.
– Affix the metal bar of tilt protector with fas- tening screw  31.
f Never remove the tilt protector.  Without the 
use of the tilt protector, the machine does 
not stand safely and can tip over, especially 
when sawing at maximum mitre/bevel an-
gles.
Mounting the Locking Knob (see figure B)
Before putting the chop and mitre saw into op-
eration for the first time, the locking knob  8 (for 
locking variable horizontal mitre angles) must 
be mounted.
– Remove the screw mounted in the locking- knob hole for shipping purposes.
– Screw the locking knob  8 into the corre-
sponding drill hole above the lever 9.
f Always tighten the locking knob 8 firmly be-
fore sawing.  Otherwise the saw blade can 
become wedged in the workpiece.
Stationary or Flexible Mounting
f To ensure safe handling, the machine must 
be mounted on a level and stable surface 
(e. g., workbench) prior to using.
Mounting to a Working Surface 
(see figures D1 – D2)
– Fasten the power tool with suitable screw  fasteners to the working surface. The holes 
13 serve for this purpose.
or
– Clamp the power tool  with commercially 
available screw clamps by the feet to the 
working surface. Mounting to 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 work-
pieces.
f
Read all safety warnings and instructions 
included with the worktable.  Failure of ob-
serving safety warnings and instructions can 
lead to electrical shock, fire and/or cause se-
rious injuries.
f Assemble the worktable properly before 
mounting the power tool.  Perfect assembly 
is important in order  to prevent the risk of 
collapsing.
– Mount the power tool on the saw stand in the  transport position.
Dust/Chip Extraction
Dusts 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 dusts can cause allergic reac-
tions and/or lead to respiratory infections of the 
user or bystanders.
Certain dusts, such as oak or beech dust, are 
considered as carcinogen ic, especially in con-
nection with wood-treatment additives (chro-
mate, wood preservative). Materials containing 
asbestos may only be worked by specialists.
– Use dust extraction whenever possible.
– 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.
The dust/chip extraction can be blocked by 
dust, chips or workpiece fragments.
– Switch the machine off and pull the mains  plug from the socket outlet.
– Wait until the saw blade has come to a com- plete stop.
– Determine the cause of the blockage and cor- rect it.
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Bosch Power Tools 1 609 929 W04 | (11/2/10)
Integrated Dust Extraction (see figure C)
For basic dust collection, use the dust bag 21 
provided.
– Press the clip of the dust bag  21 together 
and slide the dust bag over the saw dust 
ejector 25. The clip must engage into the 
groove of the saw dust ejector.
During sawing, the dust bag must never come in-
to contact with the movable machine parts.
Always empty the dust bag in good time.
f Check and clean the dust bag each time af-
ter using.
f When sawing aluminium, remove the dust 
bag to avoid the risk of fire.
External Dust Extraction
For dust extraction, a vacuum hose (size 
Ø 36 mm) can also be connected to the dust 
ejector. 
– Connect the vacuum hose with the sawdust  ejector 25.
The vacuum cleaner must be suitable for the ma-
terial being worked.
When vacuuming dry dust that is especially det-
rimental to health or ca rcinogenic, use a special 
vacuum cleaner.
Changing the Tool (see figures E1–E3)
f Before any work on the machine itself, pull 
the mains plug.
f When mounting the saw blade, wear protec-
tive gloves.  Danger of injury when touching 
the saw blade.
Use only saw blades wh ose maximum permitted 
speed is higher than the no-load speed of the 
power tool.
Use only saw blades that correspond with the 
characteristic data given in these operation in-
structions and that are tested and marked in ac-
cordance with EN 847-1.
Use only saw blades recommended by the tool 
manufacturer, and suitable for sawing the mate-
rials to be cut. Removing the Saw Blade
– Bring the power tool into the working posi-
tion.
– Press lever  1 and swing back the retracting 
blade guard  4 to the stop.
Hold the retracting blade guard in this posi-
tion.
– Loosen the screw  32 with the Phillips screw-
driver  28 provided until the fastening ele-
ment of the retracting blade guard can also 
be swung to the rear to the stop.
– Turn the Allen screw  34 with the Allen key  28 
provided while at the same time pressing the 
spindle lock  33 until it engages.
– Hold the spindle lock  33 pressed and un-
screw the Allen screw  34 in clockwise direc-
tion (left-hand thread!).
– Remove the clamping flange  35.
– Remove the saw blade  36.
Mounting the Saw Blade
If required, clean all parts to be mounted prior 
to assembly.
– Place the new saw blade onto the tool spin- dle  37.
f When mounting the saw blade, pay atten-
tion that the cutting direction of the teeth 
(arrow direction on the saw blade) corre-
sponds with the direction of the arrow on 
the blade guard!
– Place on the clamping flange  35 and the Allen 
screw  34. Press the spindle lock  33 until it 
engages and tighten the screw turning in an-
ticlockwise direction.
– Push the retracting blade guard  4 down to-
ward the front until Phillips screw  32 engag-
es in the corresponding recess.
For this, it is possible that you must counter-
hold the tool arm by the handle, to achieve 
the pre-tension of the retracting blade guard.
– Fasten the retracting blade guard  4 again 
(tighten screw  32).
– Press lever  1 and guide the retracting blade 
guard down again.
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1 609 929 W04 | (11/2/10)Bosch Power Tools
Operation
fBefore any work on the machine itself, pull 
the mains plug.
Transport Safety (see figure F)
The transport safety-lock  24 enables easier han-
dling of the machine when transporting to vari-
ous working locations.
Releasing the Machine (Working Position)
– Push the tool arm by the handle  2 down a lit-
tle in order to relieve the transport safety-
lock  24.
– Pull the transport safety-lock  24 completely 
outward.
– Guide the tool arm slowly upward.
Note:  When working, pay attention that the 
transport safety-lock is not pushed inwards. 
Otherwise, the tool arm cannot be lowered to 
the requested depth.
Securing the Machine (Transport Position)
– Press lever  1 and at the same time, swing the 
tool arm by handle  2 toward the rear until the 
transport safety-lock  24 can be pushed com-
pletely inward.
The tool arm is now securely locked for trans-
port.
Mounting the Extension Bars 
(see figure G)
Long workpieces must be underlaid or support-
ed at their free end.
To extend the saw table additionally, extension 
bars can be mounted both to the left or right of 
the power tool.
– Insert the extension bars  38 on both sides of 
the power tool to the stop in the drill holes 
16  intended for this purpose.
– Tighten the screws for securing the exten- sion bars.
Clamping the Workpiece (see figure H)
To ensure optimum working safety, the work-
piece must always be firmly clamped.
Do not saw workpieces that are too small to 
clamp.
– Press the workpiece firmly against the fence 5.
– Insert the material clamp  17 provided into 
one of the holes  14 intended for it.
– Loosen the wing bolt 39 and adapt the mate- rial clamp to the workpiece. Tighten the wing 
bolt again.
– Firmly clamp the workpiece by turning the  threaded rod  40 in clockwise direction.
Loosening the Workpiece
– To release the material clamp, turn the  threaded rod  40 in anticlockwise direction.
Adjusting the Cutting Angle
fBefore any work on the machine itself, pull 
the mains plug.
To ensure precise cuts, the basic adjustment of 
the machine must be checked and adjusted as 
necessary after intensive use (see “Checking 
and Adjusting the Basic Adjustment”, page 38).
f Always tighten the locking knob 8 firmly be-
fore sawing.  Otherwise the saw blade can 
become wedged in the workpiece.
Adjusting Horizontal Mitre Angles 
(see figure I)
The horizontal mitre angle can be set in the 
range from 47 °  (left side) to 47 °  (right side).
– Loosen the locking knob  8 in case it is tight-
ened.
– Pull the lever  9 and turn the saw table  6 until 
the desired mitre angle is indicated on the 
angle indicator  10.
– Tighten the locking knob  8 again.
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Bosch Power Tools 1 609 929 W04 | (11/2/10)
For quick and precise setting of often used mi-
tre angles, detents 11 are provided on the saw 
table:
– Loosen the locking knob  8 in case it is tight-
ened.
– Pull lever  9 and rotate the saw table  6 left or 
right to the requested detent.
– Release the lever again. The lever must be  felt to engage in the detent.
– Tighten the locking knob  8 again.
Adjusting Vertical Bevel Angles
 (see figure J)
The vertical bevel angle can be set in the range 
from –2 °  to 47 ° .
– Loosen the clamping lever  19.
– Tilt the tool arm by the handle  2 until the an-
gle indicator  41 indicates the desired bevel 
angle.
– Hold the tool arm in this position and retight- en the clamping lever  19.
For quick and precise setting of the standard 
angles 0 °  and 45 ° , factory-set stop screws ( 27 
and  18) have been provided for.
– Loosen the clamping lever  19.
– For this, tilt the tool arm by the handle  2 to 
the stop toward the right (0 ° ) or to the stop 
toward the left (45 ° ).
– Retighten the clamping lever  19 again.Starting Operation
Switching On (see figure K)
–To start the machine, press the On/Off 
switch  3 and keep it pressed.
Note:  For safety reasons, the On/Off switch  3 
cannot be locked; it must remain pressed during 
the entire operation.
The tool arm can only be guided downward 
when pressing lever  1.
–For  sawing, you must additionally press lever 
1  in addition to actuating the On/Off switch.
Switching Off
–To  switch off  the machine, release the 
On/Off switch  3.
Working Advice
General Sawing Instructions
fFor 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 ma-
chine parts. Remove possibly mounted aux-
iliary stops or adju st them accordingly.
Protect the saw blade against impact and shock. 
Do not subject the saw blade to lateral pressure.
Do not saw warped/bent workpieces. The work-
piece must always have a straight edge to face 
against the fence.
Long workpieces must be underlaid or support-
ed at their free end.
Position of the Operator (see figure M)
f Do not stand in a line with the saw blade in 
front of the machine. Always stand aside of 
the saw blade. This protects your body 
against possible kickback.
– Keep hands, fingers and arms away from the  rotating saw blade.
– Do not cross your arms when operating the  tool arm.
LeftRight
0°
15 ° ; 22.5 ° ;  30 ° ; 45 ° 15 ° ; 22.5 ° ; 
30 ° ; 45 °
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1 609 929 W04 | (11/2/10)Bosch Power Tools
Permissible Workpiece Dimensions
Maximal workpiece sizes:
Minimal  workpiece sizes
(= all workpieces that can be clamped left or 
right from the saw blade with the supplied ma-
terial clamp  17):
170 x 45 mm (length x width)
Cutting capacity, max. (0 ° /0 ° ): 89 mm
Replacing Insert Plates (see figure L)
The red insert plates  7 can become worn after 
long use of the machine.
Replace defective insert plates.
– Bring the power tool into the working posi- tion.
– Unscrew the screws  42 using the provided 
Phillips screwdriver and remove the old in-
sert plates.
– Insert the new right-hand insert plate.
– Screw the insert plate as far as possible to  the right with the screws  42 so that the saw 
blade does not come into contact with the in-
sert plate over the complete length of the 
possible slide motion.
– Repeat the work steps in the same manner  for the left-hand insert plate.Sawing
Cutting Off
– Firmly clamp the workpiece as appropriate for its dimensions.
– Adjust the requested horizontal and/or verti- cal mitre/bevel angle.
– Switch on the machine.
– Press lever  1 and slowly guide the tool arm 
downward by handle  2.
– Saw through the workpiece applying uniform  feed.
– Switch off the machine and wait until the  saw blade has come to a complete stop.
– Guide the tool arm slowly upward.
Special Workpieces
When sawing curved  or round workpieces, 
these must be especially secured against slip-
ping. At the cutting line, no gap may exist be-
tween workpiece, fence and saw table.
Provide for special fixtures, if required.Mitre/Bevel AngleHeight x Width [mm]
HorizontalVerticalat max. heightat max.  width
0° 0°
89 x 8960 x 130
45 ° 0 °
89 x 5957 x 89
0° 45°
58 x 8538 x 120
45 ° 45 °
38 x 7638 x 76
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Bosch Power Tools 1 609 929 W04 | (11/2/10)
Sawing Profile Strips/Mouldings (Floor and Ceiling Strips)
Profile strips/mouldings can be sawn in two dif-
ferent ways:
– Placed against the fence
– Lying flat on the saw table. Always make trial cuts with the mitre angle set-
ting first on scrap wood.
Floor Strips/Mouldings
The following table contains instructio ns for sawing floor strips/mouldings.
SettingsPlaced 
against 
the fenceLying flat 
on the 
saw table
Vertical bevel angle0°45 °
Floor strip/moulding
Left side Right side Left side  Right side
Inner corner Horizontal mitre 
angle
45 °  left45 °  right 0 °0 °
Positioning of 
workpiece
Bottom edge  on saw tableBottom edge  on saw table Upper edge 
against the  fence  Bottom edge 
against the  fence
The finished 
workpiece is lo-
cated...
... to the left of  the cut... to the right of the cut ... to the left of 
the cut ... to the left of 
the cut
Outer 
corner Horizontal mitre 
angle
45 °  right45 °  left
0 °0 °
Positioning of 
workpiece
Bottom edge  on saw tableBottom edge  on saw table Bottom edge 
against the  fence Upper edge 
against the  fence 
The finished 
workpiece is lo-
cated...
... to the right  of the cut... to the left of  the cut ... to the right 
of the cut ... to the right 
of the cut
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1 609 929 W04 | (11/2/10)Bosch Power Tools
Checking and Adjusting the Basic 
Adjustment
fBefore any work on the machine itself, pull 
the mains plug.
To ensure precise cuts, the basic adjustment of 
the machine must be checked and adjusted as 
necessary after intensive use.
A certain level of experience and appropriate 
specialty tools are required for this.
A Bosch after-sales service station will handle 
this maintenance task quickly and reliably.
Aligning the Angle Indicator (Horizontally)
 (see figure N)
– Bring the power tool into the working posi- tion.
– Turn the saw table  6 to the 0 °  detent 11. The 
lever  9 must be felt to engage in the detent.
Checking:
The angle indicator  10 must be in alignment 
with the 0 °  mark of the scale  12.
Adjusting:
– Loosen the screw  43 with the Phillips screw-
driver provided and align the angle indicator 
along the 0 °  mark.
– Retighten the screw again.
Aligning the Angle Indicator (Vertically)
 (see figure O)
– Bring the power tool into the working posi- tion.
– Turn the saw table  6 to the 0 °  detent 11. The 
lever  9 must be felt to engage in the detent.
– Tilt the tool arm until it faces against the stop  screw  27 for the 0 °  bevel angle and then 
tighten the clamping lever  19 again.
Checking:
The angle indicator  41 must be in alignment 
with the 0 °  mark of the scale  44.
Adjusting:
– Loosen the screw  45 with the Phillips screw-
driver provided and align the angle indicator 
along the 0 °  mark.
– Retighten the screw again. – Afterwards, check to ensure that the adjust-
ment made is correct for the 45 °  mark.
Aligning the Fence
– Bring the machine into the transport posi- tion.
– Turn the saw table  6 to the 0 °  detent 11. The 
lever  9 must be felt to engage in the detent.
Checking:  (see figure P1)
– Set an angle gauge to 90 °  and place it on the  saw table  6 between the fence  5 and the saw 
blade  36.
The leg of the angle gauge must be flush with 
the fence over the complete length.
Adjusting:  (see figure P2)
– Loosen all Allen screws  29 with the Allen key 
28  provided.
– Turn the fence  5 
 until the angle gauge is flush 
over the complete length.
– Retighten the screws again.
Setting the Standard Bevel Angle 0 °  
(Vertical)
– Bring the machine into the transport posi- tion.
– Turn the saw table  6 until it engages at 0 ° .
Checking:  (see figure Q1)
– Set an angle gauge to 90 °  and place it on the  saw table  6.
The leg of the angle gauge must be flush with 
the saw blade  36 over the complete length.
Adjusting:  (see figure Q2)
– Loosen the clamping lever  19.
– Loosen the lock nut of the stop screw  27 us-
ing a commercial box-end or open-end span-
ner (size 13 mm).
– Screw the stop screw in or out until the leg  of the angle gauge is flush with the saw blade 
over the complete length.
– Retighten the clamping lever  19 again.
– Afterwards, retighten the lock nut of the stop  screw  27 again. 
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