Bosch GDS Professional 24 Manual Original página 13

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)
– Strength properties of the material being screwed/bolted
together
– Lubrication conditions at the screw/bolt connection
The following application cases result accordingly:
– A hard seat is a metal-to-metal screw application which
uses washers. After a relatively short impact duration, the
maximum torque is reached (steep characteristic curve).
Unnecessary long impact duration only causes damage to
the machine.
– A spring-loaded seat is also a metal-to-metal screw ap-
plication but uses spring washers, disc springs, studs or
screws/nuts with conical seats. It is also called a spring-
loaded seat when extensions are used.
– A soft seat is a screw application of e.g. metal on wood or
a screw application that uses lead washers or fibre wash-
ers as backing.
For a spring-loaded seat as well as for a soft seat, the max-
imum tightening torque is lower than for a hard seat. Also, a
clearly longer impact duration is required.
Determining the impact duration
The diagrams (examples) show the tightening torque [Nm]
depending on the impact duration [s]:
Bosch Power Tools
❶ for hard seat
❷ for soft seat.
The values provided are average values and differ depending
on the application. As a control measure, always check the
tightening torque with a torque wrench.
Diagram for GDS 24
[Nm]
The maximum torque is achieved:
– After an impact duration of approx. 10 seconds for a hard
seat
– After an impact duration of approx. 22 seconds for a soft
seat
Diagram for GDS 30
[Nm]
The maximum torque is achieved:
– After an impact duration of approx. 6 seconds for a hard
seat
– After an impact duration of approx. 26 seconds for a soft
seat
Guide values for maximum screw/bolt tightening torques of
commercially available screws/bolts can be found in the fol-
lowing table.
English | 13
1
2
[s]
1
2
[s]
1 609 92A 7YG | (18.07.2023)