Craftsman 315.DD2015 Manual Del Operador página 8

WARNING:
When drilling, 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.
 With 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.
 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.
OPERATION
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
 Use a light oil on the drill bit to keep it from overheat-
ing. 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 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.
8 - English