Manual Bosch GDS 14,4 V (page 21 of 122) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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English | 21

Bosch Power Tools 1 609 929 M67 | (12.11.07)

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

– 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 focus of

the light beam is approx. 20 mm, in position 2 ap-

prox. 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 impact.

The maximum torque is achieved after an impact

duration of 6–10 seconds. After this duration,

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 impact

series are measured and transferred into a dia-

gram, resulting in the curve of a torque character-

istic. The height of the curve corresponds with

the maximum reachable torque, and the steep-

ness 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 according-

ly:

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

applications with the use of washers. After a

relatively short impact duration, the maximum

torque is reached (steep characteristic

curve). Unnecessary long impact duration on-

ly 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 wash-

ers 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 impact duration

is required.

OBJ_BUCH-595-001.book Page 21 Monday, November 12, 2007 4:15 PM

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Bosch GDS 14,4 V Manual

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