Functional Description - Maktec MT814 Manual De Instrucciones

Installing or removing drill bit
CAUTION:
• Always be sure that the tool is switched off and
unplugged before installing or removing the bit.
For Model MT814 (Fig. 2)
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 origi-
nal position.
For Model MT815 (Fig. 3)
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 clock-
wise to tighten the chuck.
To remove the bit, hold the ring and turn the sleeve coun-
terclockwise.
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.

FUNCTIONAL DESCRIPTION

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, push in the lock button and
then release the switch trigger. To stop the tool from the
locked position, pull the switch trigger fully, then release
it.
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.
Selecting the action mode (Fig. 7)
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).
4
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
CAUTION:
• There is tremendous and sudden twisting force exerted
on the tool/bit at the time of hole break-through, when
the hole becomes clogged with chips and particles, or
when striking reinforcing rods embedded in the con-
crete. Always use the side grip (auxiliary handle) and
firmly hold the tool by both side grip and switch handle
during operations. Failure to do so may result in the
loss of control of the toll and potentially serve injury.
When drilling in concrete, granite, tile, etc., slide 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.
Drilling operation
When drilling in wood, metal or plastic materials, slide
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.
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 perfor-
mance 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
workpiece.
• A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back out.
However, the tool may back out abruptly if you do not
hold it firmly.
• Always secure small workpieces in a vise or similar
hold-down device.