Manual Bosch gsb 21 2 rct (page 24 of 155) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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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

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Bosch gsb 21 2 rct Manual

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