Bosch GBM 50-2 Professional Notice Originale page 24

24 | English
Noise values
Noise emission values determined according to
EN 62841-1 Annex I.
Typically, the A-weighted noise level of the power tool is:
Sound pressure level 90 dB(A); Sound power level 110
dB(A). Uncertainty K=3 dB.
Wear hearing protection
The noise emission value given in these instructions has
been measured in accordance with a standardised measur-
ing procedure and may be used to compare power tools. It
may also be used for a preliminary estimation of noise emis-
sions.
The noise emission value given represents the main applica-
tions of the power tool. However, if the power tool is used
for other applications, with different application tools or is
poorly maintained, the noise emission value may differ. This
may significantly increase noise emissions over the total
working period.
To estimate noise emissions accurately, the times when the
tool is switched off, or when it is running but not actually be-
ing used, should also be taken into account. This may signi-
ficantly reduce noise emissions over the total working
period.
Assembly
Pull the plug out of the socket before carrying out any
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work on the power tool.
Fitting the crank handle
– Screw the three crank handles (4) tightly into the crank
hub (5).
Changing the tool (see figure A)
– Turn the drive unit all the way up using the crank handle
(4).
– Ensure that the application tools are free of grease.
Fitting the annular cutter
– Insert the pilot pin (26) into the annular cutter (27) (TCT
and HSS annular cutters require different diameters of pi-
lot pin).
– Insert the annular cutter with the pilot pin into the annular
cutter adapter (22) and tighten the screws using the hex
key (6 mm) (25).
Where possible, you should use an annular cutter with
a Weldon shank.
– Insert the annular cutter adapter into the tool holder
(12).
– Connect the coolant hose (37) with the connector on the
annular cutter adapter.
Fitting the twist drill bit
Tools with morse taper MT2:
– Insert the tool directly into the tool holder (12).
Tools with morse taper MT1:
– Insert the tool into the reduction sleeve (MT2/MT1) (30).
1 609 92A 4S6 | (10.05.2019)
– Insert the reduction sleeve (with the tool inserted) into
the tool holder (12).
Tools with cylindrical shank:
– Screw the keyed chuck (32) onto the taper mandrel (33)
and insert the tool.
– 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.
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