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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
t e s t
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 i s 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 i s 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 a t low speed will cause a reduction in the fastening 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.
10
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