Method Of Operation; Starting Operation; Working Advice - Bosch Professional GDS 24 Manual Original

OBJ_BUCH-548-001.book Page 16 Wednesday, October 24, 2007 10:10 AM
16 | English
Operation

Method of Operation

The tool holder 6 with the tool is driven by an
electric motor via a gear and impact mechanism.
The working procedure is divided into two phas-
es:
Screwing in and tightening (impact mechanism
in action).
The impact mechanism is activated as soon as
the screwed connection runs tight and thus load
is put on the motor. In this instance, the impact
mechanism converts the power of the motor to
steady rotary impacts. When loosening screws or
nuts, the process is reversed.

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
Actuate the rotational direction switch 5 on-
ly when the machine is at a standstill.
The rotational direction switch 5 is used to re-
verse the rotational direction of the machine.
Right rotation: Press the rotational direction
switch 5 downward to the stop (R).
Left rotation: Press the rotational direction
switch 5 upward to the stop (L).
Switching On and Off
To start the machine, press the On/Off switch 4
and keep it pressed.
To switch off the machine, release the On/Off
switch 4.
Adjusting the Speed
The speed of the switched on power tool can be
variably adjusted, depending on how far the
On/Off switch 4 is pressed.
Light pressure on the On/Off switch 4 results in
a low rotational speed. Further pressure on the
switch results in an increase in speed.
1 609 929 M73 | (24.10.07)

Working Advice

Operate your machine only with the auxiliary
handle 2.
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.
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
Bosch Power Tools