Intended Use; Assembly And Adjustments; Variable Speed; Operation - DeWalt DW124 Instruction Manual

...................Class II Construction
.......................(double insulated)
.../min ............per minute
IPM .................impacts per minute
SPM ...............strokes per minute
SAVE THESE INSTRUCTIONS FOR FUTURE USE
Motor
Be sure your power supply agrees with the nameplate marking. Voltage decrease of more than
10% will cause loss of power and overheating. D
not operate, check power supply.
COMPONENTS (Fig. 1, 4)
WARNING: Never modify the power tool or any part of it. Damage or personal injury could
result.
A. Bail handle D. Bail handle bolts (Fig. 4)
B. Forward/reverse button E. Side handle (two positions)
C. Trigger switch F. 1/2" (13 mm) keyed chuck

INTENDED USE

The DW124 heavy-duty stud and joist drill is designed for professional drilling at various work sites
(i.e., construction sites). DO NOT use under wet conditions or in presence of flammable liquids
or gases.
This heavy-duty stud and joist drill is a professional power tool. DO NOT let children come into
contact with the tool. Supervision is required when inexperienced operators use this tool.

ASSEMBLY AND ADJUSTMENTS

WARNING: To reduce the risk of injury, turn unit off and disconnect it from power
source before installing and removing accessories, before adjusting or when making
repairs. An accidental start-up can cause injury.
Torque (Fig. 2)
WARNING: Always use the side handle and switch handle. This is a high-torque drill. Always
hold it firmly with both hands when operating.
Torque is the twisting action which the drill imparts to the bit. As the drill bit meets resistance in the
material being drilled, the motor responds by adjusting the output torque to meet the requirement
up to the maximum capacity of the motor and gear system.
At any value of drilling torque, there is a reaction force on the drill which the operator restrains.
On the DW124, the operator is grasping the switch handle near the point of cord entry and the
side handle which is screwed into the gear case. The gripping surfaces of these two handles are
at significant distances from the drill bit thereby giving the operator ample control over the tool.
In addition to the optimized handle design, the DW124 contains a slip clutch in the low speed
range which softens the mechanical shock imparted to the operator when the large diameter
cutters bite into the work.
WARNING: To reduce the risk of serious personal injury, ALWAYS hold or brace the tool
securely in anticipation of a sudden reaction.
Assembling Side Handle (Fig. 3)
Two threaded bosses as shown in Figure 3 (one on each side of the gearcase) are for installation
of the side handle. Install side handle as shown on desired side and tighten securely by hand.
The side handle should always be used and is especially important when drilling in the low speed
setting.
Assembling Bail Handle (Fig. 4, 5, 6)
A bail handle is provided for carrying the tool and for use as an additional handle. While using the
bail handle, make sure the drill is properly braced, as in Figure 6. Assemble the bail handle in either
of the positions shown in Figure 4. When changing the location of the bail handle from one position
to the other, it is necessary to remove completely the two bolts securing it. These bolts can be
loosened or tightened with a quarter or other suitable coin as shown in Figure 5. Turn the handle
around (1/2 turn) and reinstall as desired. Always operate this tool with the bail handle installed.
Shifting to the Desired Speed (Fig. 7, 8)
To select high speed (1200 RPM) pull up on the speed selector (G) and slide it to the position
shown in Figure 7. Make sure that when you release the selector, it snaps down into the detent
in the housing.
To select low speed (300 RPM) pull up on the speed selector (G) and slide it to the position shown
in Figure 8. Make sure that when you release the selector, it snaps down into the detent in the
housing.
NOTE: It may be necessary to rotate the chuck slightly by hand when shifting speeds. Never
change speeds when the drill is running or coasting.
Switches
Depressing the trigger switch (C) turns the tool on; releasing the trigger switch turns the tool off.

VARIABLE SPEED

A variable speed trigger switch permits speed control—the farther the trigger is depressed, the
higher the speed of the drill.
NOTE: Use lower speeds for starting holes without a center punch, drilling in metal, plastics or
ceramics. Higher speeds are better for drilling wood and composition boards.
Forward/Reverse Button (Fig. 1)
A forward/reverse button (B) determines the direction of the tool. It is located above the trigger
switch.
To select forward rotation, release the trigger switch (C) and depress the forward/reverse button
on the right side of the tool.
To select reverse, depress the forward/reverse button on the left side of the tool. When changing
the position of the button, be sure the trigger is released.
NOTE: The first time the tool is run after changing the direction of rotation, you may hear a click on
start up. This is normal and does not indicate a problem.

OPERATION

WARNING: To reduce the risk of injury, turn unit off and disconnect it from power
source before installing and removing accessories, before adjusting or when making
repairs. An accidental start-up can cause injury.
WARNING: Always ensure the bit is secure before starting the tool. A loose bit may eject
from tool causing possible personal injury.
1. Open the chuck jaws by turning collar with fingers and insert bit fully into the chuck. Tighten
chuck collar by hand. Place chuck key in each of the three holes, and tighten in clockwise
direction. It's important to tighten chuck with all three holes. To release bit, turn chuck key
counter clockwise in just one hole, then loosen chuck by hand.
2. Use sharp drill bits only. For WOOD, use twist drill bits, spade bits, power auger bits, or hole
saws. For METAL, use high-speed steel twist drill bits or hole saws. For MASONRY, such as
brick, cement, cinder block etc., use carbide-tipped bits.
3. Be sure the material to be drilled is anchored or clamped firmly. If drilling thin material, use a
wood "back-up" block to prevent damage to the material.
4. Always apply pressure in a straight line with the bit. Use enough pressure to keep drill biting,
but do not push hard enough to stall the motor or deflect the bit.
5. Hold drill firmly to control the twisting action of the drill. Use side handle.
CAUTION: Drill may stall if overloaded causing a sudden twist. Always expect the stall. Grip the
drill firmly to control the twisting action and avoid injury.
6. IF DRILL STALLS, it is usually because it is being overloaded or improperly used. RELEASE
TRIGGER IMMEDIATELY, remove drill bit from work, and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN ATTEMPT TO START A STALLED DRILL — THIS CAN
DAMAGE THE DRILL.
7. To minimize stalling on breaking through the material, reduce pressure on drill and ease the
bit through the last fractional part of the hole.
8. Keep the motor running when pulling the bit back out of a drilled hole. This will help prevent
jamming.
9. A ratcheting sound heard while using the tool in low speed indicates that the clutch is
disengaging due to a high load. Continuous use of the tool with the clutch ratcheting is not
recommended.
.......................earthing terminal
........................safety alert symbol
BPM ...................beats per minute
RPM ...................revolutions per minute
sfpm ...................surface feet per minute
WALT tools are factory tested; if this tool does
E
FIG. 1
A
E
F
TORQUE REACTION
FIG. 2
DIRECTION
SENS DE RÉACTION AU
COUPLE
DIRECCION DE REACCION
DEL TORQUE
DRILLING DIRECTION
SENS DE PERÇAGE
DIRECCION DE PERFORACION
FIG. 5
FIG. 6
FORWARD
AVANT
AVANCE
FIG. 7
FIG. 8
FIG. 9 FIG. 10
C
B
FIG. 3
D
FIG. 4
REVERSE
ARRIÈRE
REVERSO
G
FIG. 11