Skil PWRCORE 12 DL529001 Owner's Manual page 17

NOTICE: There are two rules for drilling hard materials. First, the harder the material, the
greater the pressure you need to apply to the tool. Second, the harder the material, the
slower the speed should be. If the hole to be drilled is fairly large, drill a smaller hole first, then
enlarge to the required size with a larger bit; it's often faster in the long run.
Wood Drilling
For maximum performance, use high-speed steel or brad-point bits for wood drilling.
a. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
b. Increase speed as the drill bit bites into the material.
c. 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.
NOTICE: Bits may overheat unless pulled out frequently to clear chips from flutes.
Metal Drilling
For maximum performance, use high-speed steel bits for drilling metal.
a. When drilling metals, use 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.
b. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
c. Maintain a speed and a pressure that allow cutting without overheating the bit. Applying too
much pressure will:
Overheat the Drill.
–
Wear the bearings.
–
Bend or burn bits.
–
Produce off-center or irregularly shaped holes.
–
Masonry Drilling
For maximum performance, use carbide-tipped masonry bits when drilling holes in brick, tile,
concrete, etc.
a. Maintain a speed and a pressure that allow cutting without overheating the bit or Drill.
Applying too much pressure will:
Overheat the Drill.
–
Wear the bearings.
–
Bend or burn bits.
–
Produce off-center or irregular-shaped holes.
–
b. Apply light pressure and medium speed for best results in brick.
c. Apply additional pressure for hard materials such as concrete.
d. When drilling holes in tile, practice on a scrap piece to determine the best speed and
pressure.
e. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
Driving Nuts and Bolts
WARNING
dusty, also wear a dust mask.
Variable-speed control must be used with caution for driving nuts and bolts with socket set
attachments. The best technique is to start slowly, increasing speed as the nut or bolt runs
down. Set the nut or bolt snugly by slowing the drill to a stop. If this procedure is not followed,
the tool will have a tendency to torque or twist in your hands when the nut or bolt seats.
Always wear safety goggles or safety glasses with side shields
during power tool operation or when blowing dust. If operation is
17