Bosch GDS Professional 18V-320 C Manual Original página 19

Applying light pressure to the on/off switch (8) results in a
low rotational speed/impact rate. Applying increasing pres-
sure to the switch increases the speed/impact rate.
Switching on/off
To start the power tool, press and hold the on/off switch
(8).
Status indications
Status indicator for power Meaning/cause
tool (11)
Green Status OK
Yellow Critical temperature has been reached or re-
chargeable battery is almost empty
Illuminated red Power tool has overheated or rechargeable
battery is empty
Flashing blue Power tool is connected to a mobile device or
settings are being transferred
Speed preselection
With the speed preselection button (15), you can preselect
the required speed in three stages. Press button (15) as of-
ten as needed until the required setting is indicated in the
speed indicator (16). The selected setting will be saved.
You can also preselect the speed using the Bosch Toolbox
app.
The required speed depends on the material and the work-
ing conditions; it can be ascertained through practical tests.
The information in the table below describes the recommen-
ded values.
Basic speed setting at level
1
[min
Number of speed settings
3
You can use the button for speed preselection (15) to
preselect the required speed, even during operation.
Selecting the working mode
The power tool has two preset working modes A and B (12).
You can also programme working modes for different applic-
ations and adjust existing modes via the Bosch Toolbox un-
der A and B (12).
To switch between the working modes A and B (12), press
button (13).
To leave the working modes, press the button for speed
preselection (15).
Practical advice
The torque depends on the impact duration. The maximum
achieved torque results from the sum of all individual
Bosch Power Tools
The worklight (14) lights up when the on/off switch (8) is
lightly or fully pressed, allowing the work area to be illumin-
ated in poor lighting conditions.
To switch off the power tool, release the on/off switch (8).
User interface (see figure B)
The user interface (7) is used to preselect the speed and
working mode and to indicate the status of the power tool.
torques achieved through impact. Maximum torque is
achieved after an impact duration of 6–10 seconds. After
this duration, the tightening torque increases only minimally.
The impact duration is to be determined for each required
tightening torque. The tightening torque actually achieved
should always 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
2 3
– Type of backing (washer, disc spring, seal)
-1 -1 -1
] [min ] [min ]
– Strength properties of the material being screwed/bolted
– Lubrication conditions at the screw/bolt connection
1 200 1 900 2 800
The following application cases result accordingly:
– A hard seat is a metal-to-metal screw application which
– A spring-loaded seat is also a metal-to-metal screw ap-
– A soft seat is a screw application of e.g. metal on wood or
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.
Solution
–
Run the power tool at no load and allow it to
cool down, or replace or charge the battery
soon
Allow the power tool to cool down, or replace
or charge the battery
–
together
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.
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 screw application that uses lead washers or fibre wash-
ers as backing.
1 609 92A 8XR | (31.01.2024)
English | 19