Bosch Professional GBM 50-2 Original Instructions Manual page 25

– Insert the taper mandrel (with the keyed chuck screwed
in) into the tool holder (12).
Make sure that the tool clicks securely into place.
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Do not use force to insert the Morse taper/taper man-
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drel. Excessive force could damage the tool holder and
the inserted tool.
Fitting the screw tap
Use the correct screw tap adapter (23) for screw tapping.
– Insert the screw tap (24) into the adapter (23).
– With the screw tap (24) inserted, insert the adapter (23)
into the annular cutter adapter (22) and tighten it using
the hex key (6 mm) (25).
– Insert the annular cutter adapter (22) into the tool holder
(12).
Removing the tool
– Place the MT2 drill drift (34) in the opening (13) so that
the bevelled edge faces down.
If the drill drift (34) will not go through the drive spindle,
turn the application tool slightly.
– Using a hammer, push the drill drift (34) towards the tool
and remove the application tool from the tool holder.
Fitting the coolant supply system (see figure B)
The coolant system must only be used when drilling
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with the annular cutter.
The coolant tank must be filled with coolant before being
used. Before opening the valve, you must pull up the rear
small cap of the coolant tank.
Open the valve fully before switching on the power tool.
By pulling or pushing the coolant tank, the volume of the
tank can be adjusted between 500 ml and 750 ml.
The coolant supply system may not be used when drilling
into vertical or sloped surfaces, or drilling overhead.
– Insert the coolant tank (35) into the holder (36).
– With the coolant tank inserted, push the holder into the
rail (17) from above.
– Connect the connector (38) of the coolant valve to the
coolant hose (37).
The coolant tank must be filled with coolant before being
used.
– Make sure that the shut-off valve (39) is closed.
– Unscrew the coolant tank cap and fill the tank with
coolant.
– Screw the cap back onto the coolant tank.
Operation
Wear ear defenders and eye protection
when using the power tool.
Bosch Power Tools
Work preparation
Setting the Rotational Direction
Only operate the rotational direction switch (8) when
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the power tool is not in use.
– Clockwise rotation: Push the rotational direction switch
upwards to position "R".
– Anti-clockwise rotation: Push the rotational direction
switch downwards to position "L".
Note: Anti-clockwise rotation must not be used for
drilling.
Portable residual current device
Always check that the residual current device is working cor-
rectly before starting the power tool.
– Ensure that the magnet on/off switch (20) is in position
"0".
– Plug in the mains plug and press and hold the RESET but-
ton on the residual current device (15) until the indicator
(16) lights up red.
– Press and hold the TEST button on the residual current
device (15) until the indicator (16) goes out. If the indic-
ator (16) does not go out, this means the residual current
device is faulty and must be repaired. Do not work with
the power tool under any circumstances.
– Once the indicator (16) has gone out, press the RESET
button again.
– If the indicator (16) lights up red, position the tool (see
"Correctly positioning the power tool", page 25).
NOTE: After disconnecting the power tool from the
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power source, you must always perform this test
again before using the power tool.
Note: The residual current device protects against electric
shock at 10 mA or more.
Correctly positioning the power tool
A laser cross shows you the exact drilling point.
– Switch on the laser unit via the on/off switch (7).
– Position the power tool on the workpiece and align it with
the laser cross on the marking of the workpiece.
– Push the magnet on/off switch (20) upwards and check
that the power tool adheres to the surface of the work-
piece.
– Use the safety strap (42) to secure the power tool if ne-
cessary.
Fitting the safety strap (see figure C)
Whenever you are working overhead or on diagonal or
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vertical surfaces, secure the power tool with the sup-
plied safety strap to prevent it from falling over.
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1 609 92A 7Y6 | (31.05.2022)