Manual Bosch GDR 12 V (page 21 of 123) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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English | 21

Bosch Power Tools 1 609 929 T14 | (18.11.09)

Right rotation: For driving in screws and tight-

ening nuts, press the rotational direction switch

8 through to the left stop.

Left Rotation: For loosening and unscrewing

screws and nuts, press the rotational direction

switch 8 through to the right stop.

Switching On and Off

To start the machine, press the On/Off switch 9

and keep it pressed.

To switch off the machine, release the On/Off

switch 9.

Adjusting the Speed

The speed of the switched on power tool can be

variably adjusted, depending on how far the

On/Off switch 9 is pressed.

Light pressure on the On/Off switch 9 results in

a low rotational speed. Further pressure on the

switch results in an increase in speed.

Swivel Lighting System (see figure C)

Your tool is equipped with a light source in the

knurled thumbwheel 7. The light is activated as

soon as the knurled thumbwheel 7 is in position

1 – 3 and the On/Off switch 9 is pressed.

Depending on the bit being used, the light beam

can be adjusted to three positions by turning

the knurled thumbwheel 7. In position 1, the fo-

cus of the light beam is approx. 20 mm, in posi-

tion 2 approx. 150 mm and in position 3 approx.

500 mm in front of the tool holder 1.

In the “OFF” position, the light is switched off

permanently.

Working Advice

f Apply the power tool to the screw/nut only

when it is switched off. Rotating tool inserts

can slip off.

The torque depends on the impact duration. The

maximum achieved torque results from the sum

of all individual torques achieved through im-

pact. The maximum torque is achieved after an

impact duration of 6–10 seconds. After this du-

ration, the tightening torque is increased only

minimally.

The impact duration is to be determined for

each required tightening torque. The actually

achieved tightening torque is always to be

checked with a torque wrench.

Screw Applications with Hard, Spring-loaded

or Soft Seat

When in a test, the achieved torques in an im-

pact series are measured and transferred into a

diagram, resulting in the curve of a torque char-

acteristic. The height of the curve corresponds

with the maximum reachable torque, and the

steepness indicates the duration in which this is

achieved.

A torque gradient depends on the following fac-

tors:

– Strength properties of the screws/nuts

– Type of backing (washer, disc spring, seal)

– Strength properties of the material being

screwed/bolted together

– Lubrication conditions at the screw/bolt con-

nection

The following application cases result accord-

ingly:

–A hard seat is given for metal-to-metal screw

applications with the use of washers. After a

relatively short impact duration, the maxi-

mum torque is reached (steep characteristic

curve). Unnecessary long impact duration

only causes damage to the machine.

–A spring-loaded seat is given for metal-to-

metal screw applications, however with the

use of spring washers, disc springs, studs or

screws/nuts with conical seat as well as

when using extensions.

–A soft seat is given for screw applications,

e. g., metal on wood or when using lead

washers or fibre washers as backing.

For a spring-loaded seat as well as for a soft

seat, the maximum tightening torque is lower

than for a hard seat. Also, a clearly longer im-

pact duration is required.

OBJ_BUCH-595-002.book Page 21 Wednesday, November 18, 2009 5:13 PM

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Bosch GDR 12 V Manual

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