Manual Bosch PDR 18 LI (page 14 of 179) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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14 | English

1 609 92A 49G | (07.09.2018) Bosch Power Tools

To switch off the power tool, release the on/off switch (6).

Adjusting the speed

You can adjust the speed of the power tool when it is on by

pressing in the on/off switch (6) to varying extents.

A light pressure on the on/off switch (6) results in a low rota-

tional speed. Increased pressure on the switch causes an in-

crease in speed.

Temperature-dependent overload protection

In normal conditions of use, the power tool cannot be over-

loaded. If the power tool is overloaded or the permitted bat-

tery temperature is exceeded, the electronics of the power

tool will switch off until the temperature returns to within the

optimum operating temperature range.

Protection against deep discharge

The lithium-ion battery is protected against deep discharge

by the Electronic Cell Protection (ECP). When the battery is

discharged, the power tool is switched off by means of a pro-

tective circuit: The application tool no longer rotates.

Practical advice

u Only apply the power tool to the screw/nut when the

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.

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 to the maximum achievable 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 a metal-to-metal screw application which

uses washers. After a relatively short impact duration, the

maximum torque is achieved (steep characteristic curve).

An unnecessarily long impact duration only causes dam-

age 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. A much

longer impact duration is also required.

Reference values for maximum screw/bolt tightening torques

Figures given in Nm; calculated from the tensional cross-section; utilisation of the yield point: 90% (with friction coefficient

total

=0.12). As a control measure, always check the tightening torque with a torque wrench.

Property classes ac-

cording to DIN267

Standard screws/bolts High-strength

bolts

3.6 4.6 5.6 4.8 6.6 5.8 6.8 6.9 8.8 10.9 12.9

M 6 2.71 3.61 4.52 4.8 5.42 6.02 7.22 8.13 9.7 13.6 16.2

M 8 6.57 8.7 11 11.6 13.1 14.6 17.5 19.7 23 33 39

M 10 13 17.5 22 23 26 29 35 39 47 65 78

M 12 22.6 30 37.6 40 45 50 60 67 80 113 135

M 14 36 48 60 65 72 79 95 107 130 180 215

M 16 55 73 92 98 110 122 147 165 196 275 330

Tips

Before screwing larger, longer screws into hard materials, it

is advisable to predrill a pilot hole with the core diameter of

the thread to approx.

of the screw length.

Maintenance and Servicing

Maintenance and cleaning

u Remove the battery from the power tool before carry-

ing out work on the power tool (e.g. maintenance,

changing tool, etc.). The battery should also be re-

moved for transport and storage. There is risk of injury

from unintentionally pressing the on/off switch.

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Bosch PDR 18 LI Manual

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