Craftsman 315.11910 - Manual (Page 13)

OPERATIO
DRILLING
See Figure 10.
A level Is located on the top of the motor housing to help
keep the drill bit level during use.
■ Check the direction of rotation selector for the correct
setting (forward or reverse).
■ Secure the material to be drilled In a vise or with
clamps to keep It from turning as the drill bit rotates.
■ Hold the drill firmly and place the bit at the point to be
drilled.
■ Depress the switch trigger to start the drill.
■ Move the drill bit Into the workpiece, applying only
enough pressure to keep the bit cutting. Do not force
the drill or apply side pressure to elongate a hole. Let
the tool do the work.
iik WARNING: Be prepared for binding at bit break­
through. 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 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 the drill stalls,
stop the tool Immediately. Remove the bit from the
workpiece and determine the reason for jamming.
NOTE: This drill has an electric brake. When the switch
trigger Is released, the chuck stops turning. When the brake
Is functioning properly, sparks will be visible through the
vent slots on the housing. This Is normal and Is the action
of the brake.
WOOD DRILLING
For maximum performance, use high speed steel bits for
wood 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.
Fig. 10
METAL DRILLING
For maximum performance, use high speed steel bits for
metal or steel drilling.
■ 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, start with a small bit,
then finish with a larger bit. Also, lubricate the bit with
oil to Improve drilling action and Increase bit life.
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