Starting Operation; Working Advice - Bosch GCM 12 Professional Manual Original

OBJ_BUCH-1040-002.book Page 26 Friday, August 12, 2011 3:32 PM
26 | English
Adjusting with Help of the Fine Scale
With the fine scale 10, the horizontal mitre angle can be set
with an accuracy of up to ¼°.
Requested setting Fine scale mark
of the initial angle (scale 10)
X
X,25° ¼°
X,5° ½°
X,75° ¾°
Example: In order to adjust a 40.5° mitre angle, the ½° mark
of the fine scale 10 must be brought into alignment with the
42° mark of scale 9.
Adjusting Standard Bevel Angles (see figure L)
For quick and precise adjustment of commonly used bevel an-
gles, stops are provided for 0°, 45° and 33.9° angles.
– Loosen the lock lever 32.
– Standard angles 0° and 45°:
Tilt the tool arm by the handle 1 to the right stop (0°) or to
the left stop (45°).
– Retighten the lock lever 32 again.
– Standard angle 33.9°:
Pull adjustment knob 31 completely outward and turn it by
90°. Now tilt the tool arm via the handle 1 until the tool arm
can be heard to engage.
Adjusting Any Bevel Angle
The bevel angle can be set in the range from 0° to 45°.
– Loosen the lock lever 32.
– Tilt the tool arm by the handle 1 until the angle indicator 47
indicates the desired bevel angle.
– Hold the tool arm in this position and retighten the clamp-
ing lever 32.

Starting Operation

Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Switching On (see figure M)
– To start the machine, press the On/Off switch 2 and keep
it pressed.
Note: For safety reasons, the On/Off switch 2 cannot be
locked; it must remain pressed during the entire operation.
The tool arm can only be guided downward when pressing le-
ver 3.
– For sawing, you must additionally press lever 3 in addition
to actuating the On/Off switch 2.
Switching Off
– To switch off the machine, release the On/Off switch 2.
1 609 929 T11 | (12.8.11)

Working Advice

General Sawing Instructions
For all cuts, it must first be ensured that the saw blade
... bring into
at no time can come in contact with the fence, screw
alignment with
clamps or other machine parts. Remove possibly
the mark
mounted auxiliary stops or adjust them accordingly.
(scale 9)
Protect the saw blade against impact and shock. Do not sub-
X + 1° ject the saw blade to lateral pressure.
X + 2°
Do not saw warped/bent workpieces. The workpiece must al-
ways have a straight edge to face against the fence. X + 3°
Long workpieces must be underlaid or supported at their free
end.
Position of the Operator (see figure N)
Do not stand in a line with the saw blade in front of the
machine. Always stand aside of the saw blade. This pro-
tects 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.
Permissible Workpiece Dimensions
Maximal workpiece sizes:
Mitre/Bevel Angle
Horizontal
0°
45°
0°
45°
(leftward)
45°
(rightward)
Minimal workpiece sizes (= all workpieces that can be
clamped left or right from the saw blade with the provided
quick-action clamp 7):
145 x 40 mm (length x width)
Cutting depth, max. (0°/0°): 100 mm
Cutting Off
– Firmly clamp the workpiece as appropriate for its dimen-
sions.
– Adjust the requested mitre and/or bevel angle.
– Switch on the machine.
– Press lever 3 and slowly guide the tool arm downward by
handle 1.
– 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.
Height x Width [mm]
Vertical at max. height at max. width
0° 100 x 150 63 x 196
0° 104 x 105 63 x 137
45° 66 x 150 44 x 194
45° 57 x 117 38 x 134
45° 50 x 117,5 38 x 134
Bosch Power Tools