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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
:
Use the proper bit for the head of the screw that you wish to use.
Hold the tool pointed straight
at
the screw.
If
you
tighten the screw for
a
time longer than shown in the figures above, 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 determine the proper tightening time for
your screw. When tightening
a
standard screw in
a
steel
plate, the proper tightening
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.
The tightening torque
is
affected by
a
wide variety of factors including the following.
After tightening, always check the torque with
a
torque wrench.
1.
When the battery cartridge
is
discharged almost completely, voltage will drop and the
tightening torque will
be
reduced.
2.
Driver bit or socket bit
*Failure to use the correct
size
driver bit or socket bit will cause
a
reduction in the
tightening torque.
3.
Bolt
Even though the torque coefficient and the class of bolt are the same, the proper
*Even though the diameters of bolts are the same, the proper tightening torque will
4.
The manner of holding the tool or the material of driving position to be tightened will
tightening torque will differ according to the diameter of bolt.
differ according to the torque coefficient, the
class
of bolt and the bolt length.
affect the 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.
9