Use and Care Manual

14
Fastening with screws
This procedure shown in (Fig.7) will enable you to
fasten materials together with your cordless drill
without stripping, splitting or separating the material.
• First, clamp the pieces together and drill the first
hole 2/3 the diameter of the screw. If the
material is soft, drill only 2/3 the proper length.
If it is hard, drill the entire length.
• Second, unclamp the pieces and drill the second
hole the same diameter as the screw shank in the
first or top piece of wood. Third, if flat head
screw is used, countersink the hole to make the
screw flush with the surface.
• Then, simply apply even pressure when driving
the screw. The screw shank clearance hole in the
first piece allows the screw head to pull the
pieces tightly together. The adjustable screw
drill accessory will do all of these operations
quickly and easily.
DRILLING OPERATION
DRILL BITS
Always inspect drill bits for excessive wear. Use only bits that are sharp and in good condition.
TWIST BITS: Available with straight and reduced shanks for wood and light duty metal
drilling. High speed bits cut faster and last longer on hard materials.
CARBIDE TIPPED BITS: Used for drilling stone, concrete, plaster, cement and other unusually hard
nonmetals. Use continuous heavy feed pressure when employing carbide tip bits.
DRILLING WOOD
Be certain workpiece is clamped or anchored firmly. Always apply pressure in a straight line
with the drill bit. Maintain enough pressure to keep the drill “biting”. When drilling holes in wood,
twist bits can be used. Twist bits may overheat unless pulled out frequently to clear chips from flutes.
Use a “back-up” block of wood for work that is likely to splinter, such as thin materials. You will drill a
cleaner hole if you ease up on the pressure just before the bit breaks through the wood. Then complete
the hole from the back side.
DRILLING METAL
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. Here are a couple of tips
for drilling in metal. Lubricate the tip of the bit occasionally with cutting oil except when drilling soft
metals such as aluminum, copper or cast iron. If the hole to be drilled is fairly large, drill a smaller hole
first, then enlarge to the required size, it’s often faster in the long run. Maintain enough pressure to
assure that the bit does not just spin in the hole. This will dull the bit and greatly shorten its life.
Fig.7