Bosch Professional GDS 24 Original Instructions Manual page 12

12 | English
Tightening screws and nuts of the maximum permitted size:
a
h
K
The vibration level given in these instructions has been
measured in accordance with a standardised measuring pro-
cedure and may be used to compare power tools. It can also
be used for a preliminary estimation of exposure to vibra-
tion.
The stated vibration level applies to the main applications of
the power tool. However, if the power tool is used for differ-
ent applications, with different application tools or poorly
maintained, the vibration level may differ. This can signific-
antly increase the exposure to vibration over the total work-
ing period.
To estimate the exposure to vibration accurately, the times
when the tool is switched off or when it is running but not ac-
tually being used should also be taken into account. This can
significantly reduce the exposure to vibration over the total
working period.
Implement additional safety measures to protect the oper-
ator from the effects of vibration, such as servicing the
power tool and application tools, keeping the hands warm,
and organising workflows correctly.
Assembly
Changing the Tool
Pull the plug out of the socket before carrying out any
u
work on the power tool.
When fitting an application tool, make sure that it is
u
held securely in the tool holder. If the application tool is
not held securely in the tool holder, it may become loose
and consequently uncontrollable.
Slide the application tool (7) onto the square drive of the
tool holder (6).
Operation
Method of Operation
The tool holder (6) (with the application tool) is driven by an
electric motor via a gear and impact mechanism.
The working procedure is divided into two phases:
Screwing in and tightening (impact mechanism in action).
The impact mechanism is activated as soon as the screwed
connection runs tight and load is therefore put on the motor.
The impact mechanism then converts the power of the mo-
tor to steady rotary impacts. When loosening screws or nuts,
the process is reversed.
Starting Operation
Pay attention to the mains voltage. The voltage of the
u
power source must match the voltage specified on the
1 609 92A 4R3 | (28.02.2019)
GDS 24
2
m/s
2
m/s
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Products that are only sold in AUS and NZ: Use a resid-
u
ual current device (RCD) with a nominal residual current
of 30 mA or less.
Setting the rotational direction
Only operate the rotational direction switch (5) when
u
the power tool is not in use.
The rotational direction switch (5) is used to change the ro-
tational direction of the power tool.
Right rotation: Slide the rotational direction switch (5) all
the way down (R).
Left rotation: Slide the rotational direction switch (5) all the
way up (L).
Switching on/off
To start, press the on/off switch (4) and keep it pressed.
To switch off, release the on/off switch (4).
Practical advice
Pull the plug out of the socket before carrying out any
u
work on the power tool.
Do not operate your power tool without the auxiliary
u
handle (2).
Only apply the power tool to the screw/nut when the
u
tool 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. Maximum torque is
achieved after an impact duration of 6–10 seconds. After
this duration, the tightening torque is increased only minim-
ally.
Instead, the gearbox housing noticeably heats up.
Note: The consequences of excessive heating include in-
creased wear on all parts of the impact mechanism and a
high need for 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 seats
When the achieved torques in an impact series are measured
during a test and transferred into a diagram, the result is the
curve of a torque characteristic. The height of the curve cor-
responds with the maximum reachable torque, and the
steepness indicates the duration in which this is achieved.
A torque gradient depends on the following factors:
– Strength properties of the screws/nuts
– Type of backing (washer, disc spring, seal)
GDS 30
8 13
1.5
Bosch Power Tools
2