Bosch Professional GBM 50-2 Original Instructions Manual page 26

26 | English
Check that the safety strap is working properly before
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you use it. Never use a safety strap that is damaged;
instead, replace it immediately.
– Attach the safety strap (42) to the power tool so that it is
as free of play as possible.
– Push the strap through the holder (11) and place it
around the workpiece.
– Tighten the safety strap using the ratchet (40).
– To loosen the safety strap, press the pawl (41) on the
ratchet and pull out the strap.
– Attach the safety strap so that the power tool will move
away from you if it slips.
Setting the drilling depth (see figure D)
The drilling depth scale (43) on the crank hub (5) can be
used to set the required drilling depth.
The drilling depth can be set using the lines on the scale. The
distance between each of the smaller lines amounts to
1 mm, while the distance between the larger lines is 10 mm.
Starting Operation
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool.
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Switching On
– Position and secure the power tool.
– To switch on the power tool, push the motor on/off
switch (9) to position "I".
Note: The power tool can only be switched on once the mag-
net has already been activated.
Switching Off
– To switch off the power tool, push the motor on/off
switch (9) to position "0".
– Wait until the power tool has come to a complete stop.
– Push the magnet on/off switch (20) downwards to switch
off the magnet.
Restart protection
The restart protection feature prevents the power tool from
uncontrolled starting after the power supply to it has been
interrupted.
– To restart the power tool, push the motor on/off
switch (9) to position "I".
Note: Once the power supply has been restored, press the
RESET button on the residual current device (15). The mag-
net switches on automatically as soon as the indicator (16)
on the residual current device (15) lights up red.
Overload protection
The power tool is equipped with an overload protection sys-
tem. In normal conditions of use, the power tool cannot be
overloaded. In the event of overloading, the power tool auto-
1 609 92A 7Y6 | (31.05.2022)
matically shuts off the electronics. The magnet will remain
active.
– To start the power tool again after this, press the motor
on/off switch (9) into position "I".
Carry out the following steps before you continue working
with the power tool:
– Eliminate any blockages that may be present. If the ap-
plication tool jams, the anti-clockwise rotation function
must not be used.
– Allow the power tool to run with no load for approx. one
minute; afterwards, it will be ready for use again.
Overload indicator
The overload indicator (6) indicates whether an overload
has occurred when the power tool is switched on.
Green continuous light No overload
Yellow continuous Heavy workload
light
– Reduce feed speed
Red flashing light Very heavy workload
– Reduce feed speed or switch off
motor, otherwise overload pro-
tection will be activated
Adjusting the Speed
Select the correct speed before starting work. The
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speed must be appropriate for both the drilling dia-
meter and the material you intend to drill. When the
speed is set incorrectly, the application tool can become
damaged or get caught in the workpiece.
Mechanical gear selection
Only operate the gear selector switch (19) when the
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power tool is not in use.
You can preselect two speed ranges with the gear selector
switch (19).
First gear:
Low speed range for working with large drilling diameters.
Second gear:
High speed range for working with small drilling diameters.
– Press the release button (18) and turn the gear selector
switch (19) into the required position.
– If the gear selector switch is not able to be rotated in
place, turn the application tool slightly and then change to
the required position.
Speed control
You can preselect the required speed using the speed
preselection thumbwheel (2), even during operation.
The required speed depends on the application tool used
and the material being machined. This will prevent the ap-
plication tool from overheating when drilling and guarantee
high drilling quality.
Speed preselection
−1
Gear I: 50−255 min
Application tool
Annular cutter (dia.
35−50 mm), screw
tap
Bosch Power Tools