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Hold the tool firmly and place the point of the driver bit in the screw head. Apply for-
ward pressure to the tool to the extent that the bit will not slip off the screw and turn the
tool on to start operation.
NOTE
:
0
Use the proper bit for the head of the screw that you wish to use.
0
Hold the tool pointed straight
at
the screw.
0
If
you fasten the screw for
a
time longer than shown in the figures above, the screw or
the screw or the point of the driver bit may be overstressed, stripped, damaged, etc.
Before starting your job, always perform
a
test
operation to verify the adequate fasten-
ing time for your screw. When fastening
a
machine screw in
a
steel
plate, the proper
fastening torque can be obtained in an extremely short time (approx.
0.1
-0.2
seconds).
Turn the tool off
as
soon
as
the impact sound
is
heard.
.When fastening screw
M8
(5/16")
or smaller, carefully adjust pressure on the switch
trigger
so
that the screw
is
not damaged.
The fastening torque
is
affected by
a
wide variety of factors including the following.
After fastening, always check the torque with
a
torque wrench.
1.
When the battery cartridge
is
discharged almost completely, voltage will drop and the
fastening torque will be reduced.
2.
Drive bit or socket bit
Failure to use the correct
size
driver bit or socket bit will cause
a
reduction in the
fastening torque.
3.
Bolt
0
Even though the torque coefficient and the class of bolt are the same, the proper
0
Even though the diameters of bolts are the same, the proper fastening torque will
4.
The type of materials to be fastened and the manner of holding the tool will affect the
fastening torque will differ according to the diameter of the bolt.
differ according to the torque coefficient, the class of bolt and the bolt length.
torque.
5.
Operating the tool
at
low speed will cause
a
reduction in the fastening torque.
CAUTION
:
If the tool
is
operated continuously until the battery cartridge has discharged, allow the
tool to rest for
15
minutes before proceeding with
a
fresh battery.
10