5
FUNCTIONAL DESCRIPTION
Switch action
CAUTION:
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
“OFF” position when released.
For Model NHP1320S (Fig. 1)
To start the tool, simply pull the switch trigger. Release the
switch trigger to stop. For continuous operation, pull the
switch trigger and then push in the lock button. To stop the
tool from the locked position, pull the switch trigger fully,
then release it.
For Model NHP1300S (Fig. 2)
Tool speed is increased by increasing pressure on the
switch trigger. To start the tool, simply pull the switch
trigger. Release the switch trigger to stop. For continuous
operation, pull the switch trigger and then push in the lock
button. To stop the tool from the locked position, pull the
switch trigger fully, then release it. A speed control screw
is provided so that maximum tool speed can be limited
(variable). Turn the speed control screw clockwise for
higher speed, and counterclockwise for lower speed.
Selecting the action mode
Rotation with hammering (Fig. 3):
For drilling in concrete, granite, tile, etc., turn the knob so
that the marking is towards the small diamond marking.
Be sure to use a concrete and masonry drilling bit.
Rotation only (Fig. 4):
For drilling in wood, metal, or plastic materials, turn the
knob so that the marking is towards the small diamond
marking. Use a conventional bit for drilling in wood or
metal.
Reversing switch action
For Model NHP1300S (Fig. 5)
This tool has a reversing switch to change the direction of
rotation. Move the reversing switch lever to the position
for clockwise rotation or the position for
counterclockwise.
CAUTION:
• Always check the direction of rotation before drilling.
• Use the reversing switch only when the tool comes to a
complete stop. Changing the direction of rotation
before the tool stops may ruin the tool.
ASSEMBLY
Installing side grip (auxiliary handle)
(Fig. 6)
CAUTION:
• Always be sure that the tool is switched off and
unplugged before installing or removing the side grip.
Screw the side grip on the tool securely.
Installing or removing drill bit (Fig. 7)
CAUTION:
• Always be sure that the tool is switched off and
unplugged before installing or removing the bit.
To install the bit, place it in the chuck as far as it will go.
Tighten the chuck by hand. Place the chuck key in each of
the three holes and tighten clockwise. Be sure to tighten
all three chuck holes evenly. To remove the bit, turn the
chuck key counterclockwise in just one hole, then loosen
the chuck by hand.
After using the chuck key, be sure to return it to the
original position.
OPERATION
Hammer drilling operation (Fig. 8)
Position the bit at the location for the hole, then pull the
switch trigger.
Do not force the tool. Light pressure gives best results.
Keep the tool in position and prevent it from slipping away
from the hole.
Do not apply more pressure when the hole becomes
clogged with chips or particles.
Instead, run the tool at an idle, then remove from the hole.
By repeating this several times, the hole will be cleaned
out.
Drilling operation
Drilling in wood
When drilling in wood, the best results are obtained with
wood drills equipped with a guide screw. The guide screw
makes drilling easier by pulling the bit into the workplace.
Drilling in metal
To prevent the bit from slipping when starting a hole, make
an indentation with a center-punch and hammer at the
point to be drilled. Place the point of the bit in the
indentation and start drilling. Use a cutting lubricant when
drilling metals. The exceptions are iron and brass which
should be drilled dry.
CAUTION:
• Pressing excessively on the tool will not speed up the
drilling. In fact, this excessive pressure will only serve
to damage the tip of your bit, decrease the tool
performance and shorten the service life of the tool.
• There is a tremendous force exerted on the tool/bit at
the time of hole break through. Hold the tool firmly and
exert care when the bit begins to break through the
workplace.
• Always secure small workpieces in a vise or similar
hold-down device.
• A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back
out. However, the tool will pull away easily unless you
hold it firmly before starting the tool.
