Starting Operation; Working Advice - Bosch GCM 12 JL Professional Originalbetriebsanleitung

Adjusting Mitre Angles
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 36).
 Always tighten the locking knob 9 firmly before saw-
ing. Otherwise the saw blade can become wedged in the
workpiece.
Adjusting Standard Mitre Angles (see figure J)
For quick and precise adjustment of commonly used mitre an-
gles, detents 29 have been provided for on the saw table:
Left
45° 31.6° 22.5° 15°
– Loosen the locking knob 9 in case it is tightened.
– Pull lever 10 and rotate the saw table 30 left or right to the
requested detent.
– Release the lever again. The lever must be felt to engage in
the detent.
Adjusting Any Mitre Angle (see figure K)
The mitre angle can be set in the range from 52° (left side) to
52° (right side).
– Loosen the locking knob 9 in case it is tightened.
– Pull lever 10 and at the same time, push mitre detent over-
ride 11 down at the front.
This locks lever 10 and the saw table can move freely.
– Turn the saw table 30 left or right by the locking knob until
the angle indicator 12 indicates the requested mitre angle.
– Tighten the locking knob 9 again.
– To loosen the lever 10 again (for adjusting standard mitre
angles), pull the lever upward.
The mitre detent override 11 snaps back to its original po-
sition and lever 10 can re-engage into the detents 29.
Adjusting Bevel Angles
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 clamping lever 23.
– Adjust stops 19 or 26 as follows:
Mitre/Bevel Stop
Angle
0° 26
45° 19
33.9° 19
– Swing the tool arm with the handle 4 to the requested po-
sition.
– Tighten clamping lever 23 again.
Adjusting Any Bevel Angle
The bevel angle can be set in a range from –2° to +47°.
– Loosen clamping lever 23.
Bosch Power Tools
0°
15° 22.5° 31.6° 45°
Adjustment
Push the stop completely to
the rear
Turn the stop to the rear
Turn the stop to the centre
– Turn stop 19 completely to the front and pull stop 26 com-
pletely to the front.
The complete tilting range is now available.
– Tilt the tool arm by the handle 4 until the angle indicator 25
indicates the desired bevel angle.
– Hold the tool arm in this position and tighten clamping le-
ver 23 again.

Starting Operation

 Observe the mains voltage! The voltage of the power
source must correspond with the data on the type plate of
the machine.
Switching On (see figure M)
Right
To save energy, only switch the power tool on when using it.
– For starting operation, pull the On/Off switch 33 in the di-
rection of the handle 4.
Note: For safety reasons, the On/Off switch 33 cannot be
locked; it must remain pressed during the entire operation.
The tool arm can only be guided downward when pressing le-
ver 22.
– For sawing, you must additionally press lever 22 in addi-
tion to actuating the On/Off switch 33.
Switching Off
– To switch off the machine, release the On/Off switch 33.
Reduced starting current
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Note: When the machine runs at full speed immediately after
switching on, the reduced starting current has failed. The
power tool should be sent immediately to an after-sales ser-
vice (for addresses, see section "After-sales Service and Ap-
plication Service", page 37).

Working Advice

General Sawing Instructions
 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 sub-
ject the saw blade to lateral pressure.
Do not saw warped/bent workpieces. The workpiece must al-
ways have a straight edge to face against the fence.
Long workpieces must be underlaid or supported at their free
end.
Marking the Cutting Line (see figure N)
A laser beam indicates the cutting line of the saw blade. This
allows for exact positioning of the workpiece for sawing, with-
out having to open the retracting blade guard.
– For this, switch the laser beam on with the switch 31.
– Align the cutting mark on your workpiece with reference to
the right-hand edge of the laser line.
English | 33
1 609 92A 1CJ | (10.6.15)