Manual Bosch gdr 10 8v li (page 20 of 224) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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20 | English

1 609 929 T06 | (21.10.09) Bosch Power Tools

Protection Against Deep Discharging

The lithium ion battery is protected against

deep discharging by the “Electronic Cell Protec-

tion (ECP)”. When the battery is empty, the ma-

chine is switched off by means of a protective

circuit: The inserted tool no longer rotates.

Working Advice

f 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 im-

pact. The maximum torque is achieved after an

impact duration of 6–10 seconds. After this du-

ration, 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

When in a test, the achieved torques in an im-

pact series are measured and transferred into a

diagram, resulting in the curve of a torque char-

acteristic. The height of the curve corresponds

with the maximum reachable torque, and the

steepness indicates the duration in which this is

achieved.

A torque gradient depends on the following fac-

tors:

– 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 con-

nection

The following application cases result accord-

ingly:

–A hard seat is given for metal-to-metal screw

applications with the use of washers. After a

relatively short impact duration, the maxi-

mum torque is reached (steep characteristic

curve). Unnecessary long impact duration

only causes damage to the machine.

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

metal screw applications, 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 backing.

For a spring-loaded seat as well as for a soft

seat, the maximum tightening torque is lower

than for a hard seat. Also, a clearly longer im-

pact duration is required.

Reference Values for Maximum Screw/Bolt Tightening Torques

Calculated from the tensional cross-section; utilization of the yield point 90% (with friction coeffi-

cient μ

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

OBJ_BUCH-223-003.book Page 20 Wednesday, October 21, 2009 8:06 AM

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Bosch gdr 10 8v li Manual

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