Manual Bosch GSB 20-2 RCE (page 24 of 136) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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24 | English

1 609 929 T17 | (20.10.09) Bosch Power Tools

Adjusting the Speed/Impact Frequency

(GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)

The speed/impact rate of the switched on pow-

er tool can be variably adjusted, depending on

how far the On/Off switch 6 is pressed.

Light pressure on the On/Off switch 6 results in

low speed/impact rate. Further pressure on the

switch increases the speed/impact rate.

Preselecting the Speed/Impact Frequency

(GSB 20-2 RE)

With the thumbwheel for speed preselection 7,

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 20-2 RCE/GSB 20-2 RET)

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 20-2 RCE/GSB 20-2 RET)

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 20-2 RET)

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 6 still pressed, the drilling tool continues

to run only at very low speed for safety reasons.

After briefly releasing the On/Off switch 6, 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.

Working Advice

f Apply the power tool to the screw/nut only

when it is switched off. Rotating tool inserts

can slip off.

Tips

After longer periods of working at low speed, al-

low the machine to cool down by running it for

approx. 3 minutes at maximum speed with no

load.

For drilling in tiles, set the selector switch 2 to

the “Drilling” symbol. Do not switch over to the

symbol “Impact Drilling” or work with impact

until after drilling through the tile.

Use carbide tipped drill bits when working in

concrete, masonry and brick wall.

For drilling in metal, use only perfectly sharp-

ened HSS drill bits (HSS=high-speed steel). The

appropriate quality is guaranteed by the Bosch

accessories program.

Twist drills from 2.5–10 mm can easily be

sharpened with the drill bit sharpener (see ac-

cessories).

OBJ_BUCH-115-003.book Page 24 Tuesday, October 20, 2009 8:47 AM

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Bosch GSB 20-2 RCE Manual

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