Bosch GDS 18 E Professional Service Manual download pdf (Page 16)

1 609 929 M70 | (26.10.07) Bosch Power Tools

16 | English

Reversing the Rotational Direction

(see figure A)

The rotational direction switch 4 is used to re-

verse the rotational direction of the machine.

However, this is not possible with the On/Off

switch 3 actuated.

 Right rotation:

Press the rotational direction switch 4 rightward

to the stop.

 Left rotation:

Press the rotational direction switch 4 leftward

to the stop.

Switching On and Off

To start the machine, press the On/Off switch 3

and keep it pressed.

To switch off the machine, release the On/Off

switch 3.

Adjusting the Speed

The speed of the switched on power tool can be

variably adjusted, depending on how far the

On/Off switch 3 is pressed.

Light pressure on the On/Off switch 3 results in

a low rotational speed. Further pressure on the

switch results in an increase in speed.

Preselecting the Speed

The required speed can be preselected with the

thumbwheel 2 (also while running).

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 3–5 seconds. After this duration, the

tightening torque is increased only minimally.

However, the transmission housing heats up no-

ticeably.

Note: The consequences of excessive heating-up

are high wear of all hammer mechanism compo-

nents and a high requirement of lubricant.

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.

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