909 HD1050 Buku Petunjuk - Halaman 11

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Hints for use

Note.
When drilling into masonry the drilling rate is fast
and burnout of the tip will occur if the drill bit is not
constantly cleared.
•
Use only correctly sharpened drill bits, which are suitable
for the material being drilled.
•
To drill hard materials, firm pressure is required on the
power tool. However, excessive pressure does not
improve performance and places unnecessary pressure
on the tool and its bit.
•
When screw driving always use a pilot hole and set the
speed dial to low. Press firmly on the screw head and pull
the trigger gradually increasing the speed. It is always
wiser to test the screw driving on a scrap piece of the
same material you are using.
•
Larger diameter holes in hard wood, steel and concrete
have to be drilled at slower speeds. However, the motor
must not be struggling with the operation. If the motor is
struggling
DO NOT
continue working, pull the drill clear of
the workpiece and run it on fast speed for a minute or so
allowing the motor time to cool down before you attempt
a little more of the work. If the job is too hard for the drill
do not continue otherwise permanent damage to the
motor will occur.
•
Wire brushing or sanding should be carried out
on the highest speed.
•
Concrete drilling should be carried out on the
highest speed.
DO NOT
overload motor when drilling concrete.
DO NOT
use too much pressure as the hammer action
relies on the drill bit being able to move back and forward in
the hole being drilled.
Always clear the flutes of the drill bit by removing it from the
hole regularly.
Wood drilling
•
For maximum performance, use high speed steel bits for
wood drilling.
•
Move drilling/hammer mode selector to drilling mode
•
Secure the workpiece to prevent it from turning
when drilling.
•
Begin drilling at a very low speed to prevent the bit from
slipping off the starting point. Increase the speed as the
drill bit bites into the material.
•
When drilling through holes, place a block of wood behind
the workpiece to prevent ragged or splintered edges on
the back side of the hole.
•
Do not lock the trigger in the 'on' position when the drill
may need to be stopped suddenly.
Metal drilling
For maximum performance, use high speed steel bits for
•
metal or steel drilling.
Move drilling/hammer mode selector to drilling mode
•
•
Use a centre punch to mark the hole location on
the workpiece.
•
Begin drilling at a very low speed to prevent the bit from
slipping off the starting point.
•
Maintain a speed and pressure which allows cutting
without overheating the bit. Applying too much pressure
will:
– Overheat the drill
– Wear the bearings
– Bend or burn bits
– Produce off-centre or irregular shaped holes
•
When drilling large holes in metal it is recommended to
drill with a small bit at first, then finish with a larger bit.
Also, lubricate the bit with oil to improve drilling action
and increase bit life.
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