Manual Bosch GDX 18V-210 C (page 20 of 279) (All languages)

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20 | English

Applying light pressure to the on/off switch (9) 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

(9).

The worklight (18) lights up when the on/off switch (9) 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 (9).

User interface (seefigureE)

The user interface(6) is used to preselect the speed and

working mode and to indicate the status of the power tool.

Status indications

Status indicator for power

tool(15) Meaning/cause Solution

Green Status OK –

Yellow Critical temperature has been reached or re-

chargeable battery is almost empty Run the power tool at no load and allow it to

cool down, or replace or charge the battery

soon

Illuminated red Power tool has overheated or rechargeable

battery is empty Allow the power tool to cool down, or replace

or charge the battery

Flashing blue Power tool is connected to a mobile device or

settings are being transferred –

Speed preselection

With the speed preselection button (19), you can preselect

the required speed in three stages. Press button (19) as of-

ten as needed until the required setting is indicated in the

speed indicator (20). 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

123

[min-1] [min-1] [min-1]

Number of speed settings

30–1 100 0–2 300 0–3 400

You can use the button for speed preselection (19) to

preselect the required speed, even during operation.

Selecting the working mode

The power tool has two preset working modes A and B (16).

You can also programme working modes for different applic-

ations and adjust existing modes via the Bosch Toolbox un-

der A and B (16).

To switch between the working modes A and B (16), press

the mode button (17).

Practical advice

uOnly apply the power tool to the screw/nut when the

tool is switched off. Rotating tool inserts can slip off.

uThe power tool with inserted Bluetooth® Low Energy

ModuleGCY42 (accessory) is equipped with a radio

interface. Local operating restrictions, e.g. in aircraft

or hospitals, must be observed.

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 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

– 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.

1 609 92A 7X4 | (15.08.2022) Bosch Power Tools

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Bosch GDX 18V-210 C Manual

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