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Hold the tool firmly and place the point of the driver bit in the screw head. Apply for-
ward pressure t o the tool t o
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
a t
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
i s
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 :
I f the tool i s operated continuously until the battery cartridge has discharged, allow the
tool to rest for 15 minutes before proceeding with a fresh battery.
9
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