Hart HPDD25 Manual Del Operador página 7

OPERATION
ADJUSTING TORQUE
See Figure 7, page 11.
Rotate the adjustment ring to the proper torque setting for
the type of material and size of screw you are using.
• 1 - 4 For driving small screws
• 5 - 8 For driving screws into soft material
• 9 - 12 For driving screws into soft and hard
materials
• 13 - 16 For driving screws into hard wood
• 17 - 23 For driving large screws
• For drilling or high-torque applications
DRILLING/DRIVING SCREWS
See Figure 8, page 11.
 Check the direction of rotation selector for the correct
setting (forward or reverse).
 Select low speed (1) or high speed (2), depending on
your application. Refer to Two-Speed Gear Train and
Adjusting Torque.
 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, or where the screw is to be driven.
WARNING:
Do not drive a screw where there is likely to be hidden
wiring behind the surface. Contact with a "live" wire
will make exposed metal parts of the tool "live" and
possibly shock the operator. If you must drive a screw
where hidden wire may be present, always hold tool by
insulated gripping surfaces (handle) when performing the
operation to prevent a shock to the operator.
 Depress the switch trigger to start the drill.
 Move the bit into the workpiece, applying only enough
pressure to keep the bit cutting or driving the screw. 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, 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.
NOTE: MAINTENANCE INFORMATION BEGINS ON PAGE 9 AFTER
FRENCH AND SPANISH LANGUAGE SECTIONS.
ILLUSTRATIONS START ON PAGE 10.
7 – English
 When drilling hard, smooth surfaces, use a center punch
to mark the desired hole location. This will prevent the 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.
WOOD AND METAL DRILLING
For maximum performance, use high speed steel bits for
wood or metal drilling. Select drilling mode on torque adjust-
ment ring and switch the gear train to high speed. Begin
drilling at a very low speed to prevent the bit from slipping
off the starting point.
Wood Drilling
 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.
Metal and Steel Drilling
 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.
 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.
NOTE: If operation creates considerable dust, frequent
vacuuming of the work area is recommended.