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For HP2050, HP2050F
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.
For HP2051, HP2051F
Hold the ring and turn the sleeve counterclockwise to
open the chuck jaws. Place the bit in the chuck as far as it
will go. Hold the ring firmly and turn the sleeve clockwise
to tighten the chuck. To remove the bit, hold the ring and
turn the sleeve counterclockwise.
Depth gauge (Fig. 4)
The depth gauge is convenient for drilling holes of uni-
form depth. Loosen the side grip and insert the depth
gauge into the hole in the grip base. Adjust the depth
gauge to the desired depth and tighten the side grip.
NOTE:
The depth gauge cannot be used at the position where
the depth gauge strikes against the gear housing.
Switch action (Fig. 5)
CAUTION:
Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to the "OFF"
position when released.
To start the tool, simply pull the switch trigger. Tool speed
is increased by increasing pressure on the switch trigger.
Release the switch trigger to stop. For continuous opera-
tion, pull the switch trigger and then push in the lock but-
ton. 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.
Lighting up the lamps (HP2050F, HP2051F)
CAUTION:
Do not look in the light or see the source of light directly.
To turn on the lamp, pull the trigger. Release the trigger
to turn it off.
NOTE:
Use a dry cloth to wipe the dirt off the lens of lamp. Be
careful not to scratch the lens of lamp, or it may lower the
illumination.
Reversing switch action (Fig. 6)
This tool has a reversing switch to change the direction of
rotation. Move the reversing switch lever to the
D posi-
tion (A side) for clockwise rotation or to the
E position
(B side) for counterclockwise rotation.
CAUTION:
Always check the direction of rotation before operation.
Use the reversing switch only after the tool comes to a
complete stop. Changing the direction of rotation
before the tool stops may damage the tool.
Speed change knob (Fig. 7)
Two speed ranges can be preselected with the speed
change knob. Turn the speed change knob so that the
arrow on the tool body points toward the " I " position on
the knob for low speed or " II " position for high speed.
If it is hard to turn the knob, first turn the chuck slightly in
either direction and then turn the knob again.
CAUTION:
Use the speed change knob only after the tool comes
to a complete stop. Changing the tool speed before the
tool stops may damage the tool.
Always set the speed change knob to the correct posi-
tion. If you operate the tool with the speed change knob
positioned halfway between the " I " and " II " position,
the tool may be damaged.
Selecting the action mode (Fig. 8)
This tool has an action mode change lever. For rotation
with hammering, slide the action mode change lever to
the right (
g symbol). For rotation only, slide the action
mode change lever to the left (
m symbol).
CAUTION:
Always slide the action mode change lever all the way to
your desired mode position. If you operate the tool with
the lever positioned halfway between the mode symbols,
the tool may be damaged.
OPERATION
Hammer drilling operation
When drilling in concrete, granite, tile, etc., move the
action mode change lever to the position of
g symbol to
use "rotation with hammering" action. Be sure to use a
tungsten-carbide tipped bit. Do not apply more pressure
when the hole becomes clogged with chips or particles.
Instead, run the tool at an idle, then remove the bit par-
tially from the hole. By repeating this several times, the
hole will be cleaned out. After drilling the hole, use the
blow-out bulb to clean the dust out of the hole. (Fig. 9)
Drilling operation
When drilling in wood, metal or plastic materials, move
the action mode change lever to the position of
m symbol
to use "rotation only" action.
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
workpiece.
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.
5


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