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DRILLING
See Figure 16.
I0
Fig. 16
When drilling hard smooth surfaces use a canter
'
punch to mark desired hole location. This will prevent
the drill bit from slipping off center as the hole is
started. However, the low speed feature allows
starting holes without center pbnching if desired. To
accomplish this, simply operate your drill at a low
speed until the hole is started.
The material to be drilled should be secured in a vise
or with clamps to keep it from turning as the drill bit
rotates.
Hold tool firmly and place the bit at the point to be
drilled. Depress the switch trigger to start tool.
Move the drill bit into the workpieca applying only
enough pressure to keep the bit cutting. Do not force
or apply side pressure to elongate a hole.
,_
WARNING:
Be prepared for binding or bit
breakthrough. When these situations occur, drill
has a tendency to grab and kick opposite to the
direction of rotation and could cause loss of
control when breaking through material. If not
prepared, this loss of control can result in
possible serious injury.
When drilling metals, use a light oil on the drill bit to
keep it from overheating. The oil will prolong the life of
the bit and increase the drilling action.
If the bit jams in workpiece or if the ddll stalls, release
switch trigger immediately. Remove the bit from the
workpiece and determine the reason for jamming.
WOOD
DRILLING
•
For maximum performance, use high speed steel
bits for wood ddlling.
•
Turn mode selector ring on hammer ddlt to normal
ddlling action.
•
Begin drilling at a very low speed to prevent the bit
from slipping off the starting point. Increase the
speed as the ddll 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 on forJobs where your
hammer drill may need to be stopped
suddenly.
METAL
DRILLING
•
For maximum performance, use high speed steel
bits for metal or steel drilling.
J
•
Turn mode selector on hammer drill to normal
ddlling action.
•
B6gin ddlling at a very low speed to prevent the bit
from slipping off the starting point.
•
MaiNtain a speed and pressure Which allows
cutting without overeating the bit. Applying too
much pressure will: .
•
Overheat the ddll;
Wear the bearings;
Bend or bum bit_; and
Produce off-center or irregular shaped holes.
•
When drilling large holes in metal, we recommend
that _ou ddll with a small bit at first, then finish with
a larger bit. Also, lubdcate the bit with oil to
improve dqlling action and increase bit life.
MASONRY
DRILLING
•
For maximum performance use carbide-tipped
masonry impact bits when ddlling holes in
bdck, tile, concrete, etc.
•Tum
mode selector on hammer ddUto
hammer mode. Rotate torque selector to ddll
position.
•
Apply light pressure and medium speed for best
results in brick.
•
Apply additional pressure and high speed for hard
matadals such as concrete.
•
When drilling holes in tile, practice on a scrap
piece to determine the best speed and pressure.
14
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