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15
1 609 929 H17 • 19.1.07
Changing the Tool
f
Before any work on the machine itself, pull
the mains plug.
Drilling tools with a MK2 morse taper can be inserted
directly into the tool holder
4
. For drill bits with MK1
morse taper, use the reducing sleeve
10
.
Pay attention that the morse cone and the morse taper
are free of grease.
The use of drilling tools with cylindrical shank is possi-
ble with the key chuck
12
. For this, place the tapered
arbor
11
into the tool holder
4
and firmly screw on the
key chuck
12
.
f
Do not exert any force when inserting the
morse taper or the tapered arbor.
This can dam-
age the tool holder and the inserted tool.
Before removing the inserted tool, unscrew the auxiliary
handle
2
.
Place the drift
9
into the opening
3
in such a manner
that the rounded-off side faces to the pressure plate
1
.
If the drift
9
cannot be inserted through the drive spin-
dle, turn the tool insert a little.
Press the drift
9
toward the pressure plate
1
and
release the tool insert from out of the tool holder.
Operation
Starting Operation
f
Observe correct mains voltage! The voltage of
the power 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.
Gear Selection, Mechanical
f
Actuate the gear selector 7 only when the
machine is at a standstill.
Two speed ranges can be preselected with the gear
selector
7
.
1st gear:
Low speed range; for working with large
drilling diameter.
2nd gear:
Higher speed range; for working with
small drilling diameter.
If the gear selector
7
cannot be fully engaged, lightly
rotate the drive spindle with the drill bit by twisting the
drill chuck.
Switching On and Off
To
start
the machine, press the On/Off switch
6
and
keep it depressed.
Lock the
pushed
On/Off switch
6
by pushing the lock-on button
5
upward.
To
switch off
the machine, release the On/Off switch
6
or when it is locked with the lock-on button
5
, briefly
press the On/Off switch
6
and then release it.
Adjusting the Speed (GBM 23-2 E)
The speed of the switched on power tool can be varia-
bly adjusted, depending on how far the On/Off switch
6
is pressed.
Light pressure on the On/Off switch
6
results in a low
rotational speed. Further pressure on the switch results
in an increase in speed.
Operating Instructions
Use drilling lubricant or cutting oil for cooling and lubri-
cation, and to avoid overheating or jamming of the drill
bit.
When drilling diameters >10 mm, drill a pilot hole with
a small drilling diameter. This allows you to reduce the
feed pressure and the power tool is strained less.
For drilling in metal, use only perfectly sharpened HSS
drill bits (HSS=high-speed steel). The appropriate qual-
ity is guaranteed by the Bosch accessories program.
The machine vice, which is available as an accessory,
enables secure clamping of workpieces. This prevents
the workpiece from turning and any accidents this
would cause.
Maintenance and Service
Maintenance and Cleaning
f
Before any work on the machine itself, pull
the mains plug.
f
For safe and proper working, always keep the
machine and ventilation slots clean.
If the machine should fail despite the care taken in man-
ufacturing and testing procedures, repair should be
carried out by an after-sales service centre for Bosch
power tools.
In all correspondence and spare parts order, please
always include the 10-digit article number given on the
type plate of the machine.
OBJ_BUCH-35-002.book Page 15 Friday, January 19, 2007 8:10 AM
