Mode d’emploi Bosch GDS 18V-EC 300 ABR Visseuse à choc

Mode d’emploi

8 | English

1 609 92A 3L6 | (2.11.16) Bosch Power Tools

There is danger of injury when unintentionally actuating

the On/Off switch.

 Regularly clean the power tool’s air vents. The motor’s

fan will draw the dust inside the housing and excessive ac-

cumulation of powdered metal may cause electrical haz-

ards.

 When working with an application tool, pay attention

that the application tool is connected securely on the

tool holder. When the application tool is not securely con-

nected with the tool holder, it can come off during applica-

tion.

Slide the application tool 12 onto the square drive of the tool

holder 1.

With this system, there will be a slight amount of play around

the application tool 12 after connecting securely to the tool

holder 1; this has no influence on the function/safety.

Operation

Method of Operation

The tool holder 1 with the 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 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.

Automatic Shutdown ABR (ABR = Auto Bolt Release)

(see figure C)

The ABR function automatically shuts down the power tool

when the bolt nut is released. The automatic shutdown pre-

vents the bolt nut from falling down when released. You can

use the “Auto Bolt Release (ABR)” button 6 to activate and de-

activate ABR. The LED for “Auto Bolt Release (ABR)” 7 lights

up when ABR is activated. The previous setting is retained

when the battery is changed.

Starting Operation

Inserting the battery

Set the rotational direction switch 8 to the centre position to

protect the power tool against accidental starting.

Insert the charged battery 4 from the front into the base of the

power tool until the battery is securely locked.

Reversing the rotational direction(see figure B)

The rotational direction switch 8 is used to reverse the rota-

tional direction of the machine. However, this is not possible

with the On/Off switch 9 actuated.

Right rotation: For driving in screws and tightening nuts,

press the rotational direction switch 8 through to the left

stop.

Left Rotation: For loosening and unscrewing screws and

nuts, press the rotational direction switch 8 through to the

right stop.

Switching On and Off

To start the machine, press the On/Off switch 9 and keep it

pressed.

To switch off the machine, release the On/Off switch 9.

Adjusting the Speed

The speed of the switched-on power tool can be variably ad-

justed, depending on how far the On/Off switch 9 is pressed.

Light pressure on the On/Off switch 9 results in a low rotation-

al speed. Further pressure on the switch results in an increase

in speed.

Working Advice

 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 dura-

tion, the tightening torque is increased only minimally.

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

A test in which the achieved torques in an impact series are

measured and transferred to a diagram will produce the curve

of a torque characteristic. The height of the curve corre-

sponds with the maximum reachable torque, and the steep-

ness 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 given for metal-to-metal screw applications

with the use of washers. After a relatively short impact du-

ration, the maximum torque is reached (steep characteris-

tic curve). Unnecessary long impact duration only causes

damage to the machine.

–A spring-loaded seat is given for metal-to-metal screw ap-

plications, however with the use of spring washers, disc

springs, studs or screws/nuts with conical seat as well as

when using extensions.

–A soft seat is given for screw applications, e. g., metal on

wood or when using lead washers or fibre washers as back-

ing.

For a spring-loaded seat as well as for a soft seat, the maxi-

mum tightening torque is lower than for a hard seat. Also, a

clearly longer impact duration is required.

OBJ_BUCH-2707-002.book Page 8 Wednesday, November 2, 2016 11:08 AM

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