Tightening Torque - Bosch GDS18V-740C Mode D'emploi

2610067376 08-21 GDS18V-740C.qxp_GDS18V-770 8/18/21 7:00 AM Page 19
Always hold the tool straight on the bolt to
be tightened.
The best method to determine the right
impacting/tightening duration is by means
of a trial. For small screws, the right
impacting/ tightening duration can be
reached in less than 0.5 Sec. Therefore,
work with low RPM and switch the tool off
immediately when the screw is tight and
the impacting sound can be heard.
For screwing larger, longer wood screws
into hard material, pre-drilling is the best
method.

Tightening Torque

The tightening torque depends on the
duration of the impacting/tightening action.
The largest tightening torque is achieved
after approx. 6 to 10 Sec. impacting /
tightening action.
The torque build-up depends on the
following factors:
• Hardness of the bolts/nuts.
• Type of washer (disk washer, spring
washer, seal).
• Hardness of the material to be joined.
• Lubricating effect at the surfaces of the
junction.
This leads to the following application
cases:
Hard joining application: The joining of
metal to metal with a disk washer. The
maximum torque is reached after a relative
short impacting/tightening action.
Medium joining application: The joining of
metal to metal when using spring ring
washer, disk spring washer, stud bolts or
bolts/nuts with conical seats.
Soft joining application: The joining of e.g.
metal to wood or insulation material.
For middle or soft joining cases, the
maximum tightening torque is less than for
hard cases.
impacting/tightening action is necessary to
arrive at the maximum tightening torque.
Selecting the working mode
The power tool has two preset working
modes: A and B (17). You can also program
working modes for different applications
and adjust existing modes via the Bosch
Toolbox under A and B.
To switch between the working modes A
and B (17), press the Mode button (16).
Operating Instructions
Therefore, a longer
By Default Mode A is designed for Self-
Drilling Screws. Auto Slow Down is
activated in both the forward and reverse
directions.
By Default Mode B is designed for Wood
Screws. In the forward direction Auto Shut-
off is activated. In the reverse direction
Auto Shut Off functions as Auto-Bolt
Release for the default Mode B.
Note: Only one Setting or Mode can be
active on the tool at a time. 1, 2, 3, A, or B.
Fastening with screws
The procedure shown in (Fig. 11) will help
to fasten ma terials together with your tool
and will reduce the possibility of stripping,
splitting or separating the material.
Fig. 11
FASTENING
WITH SCREWS
1. Drill 2/3 diameter and
2/3 of screw length for
soft materials, full
length for hard
materials.
Apply a slight
even pressure
when driving
screws.
First, clamp the pieces together and drill
the first hole 2/3 the diam eter of the
screw. If the material is soft, drill only 2/3
the proper length. If it is hard, drill the
entire length.
Second, unclamp the pieces and drill the
second hole the same diameter as the
screw shank in the first or top piece of
wood.
Third, if flat head screw is used,
countersink the hole to make the screw
flush with the surface. Then, simply apply
even pressure when driving the screw. The
screw shank clearance hole in the first
piece allows the screw head to pull the
pieces tightly together.
19
2. Drill same
diameter as
screw shank.
3. Countersink
same diameter
as screw head.
Screw