RIDGID R7122 Manual Del Operador página 8

OPERATION
NOTICE:
To prevent gear damage, always allow the chuck
to come to a complete stop before changing the
direction of rotation.
CHUCK KEY
See Figure 6, page 11.
A chuck key has been provided for use when installing or
removing bits. When not in use, the chuck key can be placed
in the chuck key storage area on the power cord.
INSTALLING/REMOVING BITS
See Figures 7 and 8, page 11.
To install bits:
 Unplug the drill.
 Insert the chuck key and twist counterclockwise.
 Open or close the chuck jaws to a point where the opening
is slightly larger than the bit size you intend to use. Also,
raise the front of the drill slightly to keep the bit from falling
out of the chuck jaws.
 Insert the drill bit into the chuck.
WARNING:
Make sure to insert the drill bit straight into the
chuck jaws. Do not insert the drill bit into the chuck
jaws at an angle then tighten, as shown in figure 8.
This could cause the drill bit to be thrown from the
drill, resulting in possible serious personal injury or
damage to the chuck.
 Tighten the chuck jaws securely on the drill bit, using the
chuck key provided. Do not use a wrench to tighten or
loosen the chuck jaws. For best performance, repeat this
for the remaining two key holes.
 Remove the chuck key and return it to the storage area.
To remove bits:
 Unplug the drill.
 Loosen the chuck jaws using the chuck key provided.
 Remove the drill bit from the chuck jaws.
 Remove the chuck key and return it to the storage area.
DRILLING
See Figures 9 and 10, page 12.
 Depress and release the switch trigger to be sure the
drill is in the OFF position before connecting it to power
supply.
 Check the direction of rotation selector for 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.
 Install auxiliary handle.
 Plug the drill into power supply source.
 Hold the drill firmly and place the bit at the point to be
drilled.
 Depress the switch trigger to start the drill. Do not lock
the switch ON for jobs 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 drill and
bit 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.
 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.
For mixing:
 Install a paddle bit (not supplied) into the chuck.
 Place the paddle bit into the compound and slowly depress
the switch trigger. As mixing begins, increase the speed
of the drill. Use the auxiliary handle for increased control.
WOOD AND METAL DRILLING
For maximum performance, use high speed steel bits for
wood or metal drilling. 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:
 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.
8 - English