Bosch GDS 18 V-EC 25 06019D8120 [14/180] Working advice

Bosch GDS 18 V-EC 25 06019D8120 [14/180] Working advice
14 | English
1 609 92A 1CL | (6.5.15) Bosch Power Tools
Reversing the rotational direction (see figure B)
The rotational direction switch 6 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 7 actuated.
Right rotation: For driving in screws and tightening nuts,
press the rotational direction switch 6 through to the left
stop.
Left rotation: For loosening and unscrewing screws and
nuts, press the rotational direction switch 6 through to the
right stop.
Switching On and Off
To start the machine, press the On/Off switch 7 and keep it
pressed.
To switch off the machine, release the On/Off switch 7.
Adjusting the Speed
The speed of the switched-on power tool can be variably ad-
justed, depending on how far the On/Off switch 7 is pressed.
Light pressure on the On/Off switch 7 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 610 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.
Reference Values for Maximum Screw/Bolt Tightening Torques
Calculated from the tensional cross-section; utilization of the yield point 90 % (with friction coefficient μ
total
= 0.12). As a control
measure, always check the tightening torque with a torque wrench.
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.
2
/
3
of the screw length.
Note: Pay attention that no metal particles enter the power
tool.
Belt Clip
With the belt clip 3, the machine can be hung onto a belt. The
user has both hands free and the machine is always at hand.
Recommendations for Optimal Handling of the Battery
Protect the battery against moisture and water.
Store the battery only within a temperature range between
20 °C and 50 °C. As an example, do not leave the battery in
the car in summer.
Property Classes
according to DIN 267
Standard Screws/Bolts
3.6 4.6 5.6 5.8 6.8 8.8 10.9 12.9
M 6
2.71 3.61 4.52 6.02 7.22 9.7 13.6 16.2
M 8
6.57 8.7 11 14.6 17.5 23 33 39
M 10
13 17.5 22 29 35 47 65 78
M 12
22.6 30 37.6 50 60 80 113 135
M 14
36 48 60 79 95 130 180 215
M 16
55 73 92 122 147 196 275 330
M 18
81 110 135 180 215 290 405 485
M 20
115 155 190 255 305 410 580 690
OBJ_BUCH-2279-002.book Page 14 Wednesday, May 6, 2015 2:21 PM

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