Craftsman 315.101371 Operator's Manual page 10

 Depress the variable speed switch.
 Push in and hold the lock-on button, located on the
side of the handle.
 Release the variable speed switch.
 Release the lock-on button and the drill will continue
running.
 To release the lock, depress and release the variable
speed switch.
If the lock-on feature is engaged during use and the drill
becomes disconnected from the power supply, disengage
the lock-on feature immediately.
WarnInG:
Before connecting the hammer drill to
a power supply source, always check to be sure it
is not in lock-on position (depress and release the
variable speed switch). Failure to ensure that it is not
locked-on could result in accidental starting of the
drill resulting in possible serious injury. Do not lock
the variable speed switch in applications where the
drill may need to be suddenly stopped.
DrIllInG
See Figures 7 - 8, page ii.
Levels are located on the top and end of the motor
housing to help keep the drill bit level during use.
 Depress and release the variable speed switch to be
sure the drill is in the OFF position before connecting it
to a power supply.
 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.
 Plug the hammer drill into power supply. Hold the drill
firmly and place the bit at the point to be drilled.
 Depress the variable speed switch to start the drill. Do
not lock the variable speed switch On for applications
where the 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
the drill or apply side pressure to elongate a hole. Let
the tool do the work.
WarnInG:
Be prepared for binding at bit
breakthrough. When these situations occur, the 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
variable speed switch On in applications where the
drill may need to be stopped suddenly.
 When drilling hard, smooth surfaces, use a center
punch to mark the desired hole location. This will
OperatIOn
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.
WOOD DRILLING
 For maximum performance, use high speed steel bits
for wood drilling.
 Select drilling mode.
 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 variable speed switch On for
applications where the drill may need to be stopped
suddenly.
METAL DRILLING
 For maximum performance, use high speed steel bits
for metal or steel drilling.
 Select drilling mode.
 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; 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.
MasOnrY DrIllInG
 For maximum performance, use carbide-tipped
masonry impact bits when drilling holes in brick, tile,
concrete, etc.
 Slide adjustment button on hammer drill left for
hammer mode.
 Apply light pressure and medium speed for best results
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. Begin drilling
at a very low speed to prevent the bit from slipping off
the starting point.
10 - English