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OPERATION
■
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 pres-
sure will:
Overheat the drill;
Wear the bearings;
Bend or burn bits; and
Produce off-center or irregular shaped holes.
■
When drilling large holes in metal, we recommend that
you drill with a small bit first, then finish with a larger bit.
Also, lubricate the bit with oil to improve drilling action
and increase bit life.
MASONRY DRILLING
■
For maximum performance use carbide-tipped ma-
sonry impact bits when drilling holes in brick, tile,
concrete, etc.
■
Slide adjustment button on hammer drill up for ham-
mer mode.
■
Apply light pressure and medium speed for best re-
sults in brick.
■
Apply additional pressure for hard materials such as
concrete.
■
When drilling holes in tile, practice on a scrap piece to
determine the best speed and pressure.
DRILLING
See Figure 11.
■
Depress and release switch trigger to be sure your drill
is in OFF position before connecting it to power supply.
■
Check the direction of rotation lever for correct setting
(forward or reverse).
See Figure 3.
■
Secure the material to be drilled in a vise or with
clamps to keep it from turning as the drill bit rotates.
■
Plug your hammer drill into power supply source.
■
Hold your drill firmly and place bit at point to be drilled.
■
Depress the switch trigger to start your drill. Do not
lock the switch ON for jobs where your drill may need
to be stopped suddenly.
■
Move the drill bit into the workpiece applying only
enough pressure to keep the bit cutting. Do not force
your drill or apply side pressure to elongate a hole. Let
your drill and bit do the work.
See Figure 11.
WARNING:
Be prepared for binding or breakthrough. When these
situations occur, drill has a tendency to grab and kick in
the opposite direction and could cause loss of control when
breaking through material. This loss of control can result
in possible serious injury. Do not lock the trigger on jobs
where your drill may need to be stopped suddenly.
When drilling hard, smooth surfaces use a center punch to
mark the desired hole location. This will prevent the drill bit
from slipping off center as the hole is started.
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 the workpiece or if your drill stalls, stop the
tool 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 drilling.
■
Slide adjustment button on hammer drill down for
normal drilling action.
■
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 ON for jobs 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.
■
Slide adjustment button on hammer drill down for
normal drilling action (drill mode).
Fig. 11
Содержание craftsman 315.101390
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