Starting Operation; Working Advice - Bosch GDS 18 E Professional Notice Originale

OBJ_BUCH-544-002.book Page 16 Tuesday, February 8, 2011 1:09 PM
16 | English

Starting Operation

Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
Reversing the Rotational Direction
(see figure A)
The rotational direction switch 7 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 5 actuated.
– Right rotation:
Press the rotational direction switch
7 rightward to the stop.
– Left rotation:
Press the rotational direction switch
7 leftward to the stop.
Switching On and Off
– To start the machine, press the On/Off
switch 5 and keep it pressed.
– To switch off the machine, release the
On/Off switch 5.
Adjusting the Speed
The speed of the switched on power tool can be
variably adjusted, depending on how far the
On/Off switch 5 is pressed.
Light pressure on the On/Off switch 5 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 6 (also while running).
1 609 929 Y31 | (8.2.11)

Working Advice

Before any work on the machine itself, pull
the mains plug.
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 3–5 seconds. After this dura-
tion, the tightening torque is increased only min-
imally.
However, the transmission housing heats up no-
ticeably.
Note: The consequences of excessive heating-
up are high wear of all hammer mechanism com-
ponents 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 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
Bosch Power Tools