Bosch GSB 21-2 RCT User Manual

24 | English
2 609 932 659 | (4.2.09) Bosch Power Tools
Switching On and Off
To start the machine, press the On/Off switch 8
and keep it pressed.
To lock the pressed On/Off switch 8, press the
lock-on button 6.
To switch off the machine, release the On/Off
switch 8 or when it is locked with the lock-on
button 6, briefly press the On/Off switch 8 and
then release it.
Safety Clutch
To limit dangerous reaction
torque, the machine is
equipped with a safety clutch
(anti-rotation).
f If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. Because of the forces that occur,
always hold the power tool firmly with both
hands and provide for a secure stance.
f If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Adjusting the Speed/Impact Frequency
The speed/impact rate of the switched on pow-
er tool can be variably adjusted, depending on
how far the On/Off switch 8 is pressed.
Light pressure on the On/Off switch 8 results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Preselecting the Speed/Impact Frequency
With the thumbwheel for speed preselection 9,
the required speed/impact frequency can be
preselected even during operation.
The required speed/impact frequency depends
on the material and the working conditions, and
can be determined through practical testing.
Electronic Speed Preselection (GSB 21-2 RCT)
With the thumbwheel for electronic speed
preselection 3, the required speed/impact fre-
quency can be selected even if the machine is
running.
The required speed/impact frequency depends
on the material and the working conditions, and
can be determined through practical testing.
Constant Electronic Control (GSB 21-2 RCT)
The constant electronic control keeps the prese-
lected speed and impact rate nearly constant
between no-load and load conditions.
Electronic Torque Limitation/Speed Preselec-
tion (Torque Control) (GSB 21-2 RCT)
Drilling with speed preselection:
Set the selector switch 4 to the
“Drilling” symbol. The required
speed can be selected with the
thumbwheel 3; it can also be adjust-
ed during operation.
Screwdriving with torque limita-
tion: Set the selector switch 4 to the
“Screwdriving” symbol. The effec-
tive torque at the drill spindle can be
variable adjusted with the thum-
bwheel 3 during operation:
I=low torque,
III=high torque.
The maximum speed is automatically adapted to
the adjusted torque.
If the preselected torque is reached during
screwdriving, the machine switches off; the
drilling tool no longer rotates. If the load on the
machine is then removed with the On/Off
switch 8 still pressed, the drilling tool continues
to run only at very low speed for safety reasons.
After briefly releasing the On/Off switch 8, the
next screw can be driven in with the same
torque.
For screwdriving without torque
limitation, turn the thumbwheel 3 to
the right stop. This setting is re-
quired, when the torque in
position III is not sufficient.
OBJ_BUCH-909-001.book Page 24 Wednesday, February 4, 2009 7:50 AM

Bosch GSB 21-2 RCT Specifications

General

Reverse	Yes
Chuck type	Keyless
Built-in light	-
Product design	Pistol grip drill
Torque (max)	43 N⋅m
Spindle thread	1/2\
Number of gears	2
Idle speed (max)	3000 RPM
Sound power level	106 dB
Chuck capacity (max)	13 mm
Chuck capacity (min)	1.5 mm
Sound pressure level	95 dB
Idle speed (1st gear)	900 RPM
Sound level uncertainty	5 dB
Impact rate (high speed)	51000 bpm
Vibration level (screwdriving)	2.5 m/s²
Drilling diameter in wood (max)	40 mm
Drilling diameter in steel (max)	16 mm
Vibration level (metal drilling)	5.6 m/s²
Drilling diameter in concrete (max)	22 mm
Vibration level (concrete drilling)	14.6 m/s²
Vibration level uncertainty (metal drilling)	1.5 m/s²
Vibration level uncertainty (concrete drilling)	1.8 m/s²
Input power	1300 W
Output power	695 W
Power source	AC
AC input voltage	230 V

Weight and Dimensions

Depth	220 mm
Width	363 mm
Height	81 mm
Weight	2900 g
Package depth	390 mm
Package width	360 mm
Package height	110 mm