DRILL BITS
Always inspect drill bits for excessive wear.
Use o nly b its that are sharp and in good
condition.
TWIST BITS : Ava ilabl e wi th s traigh t an d
reduced shanks for wood and light duty metal
drilling. High speed bits cut fas ter and last
longer on hard ma terials.
CARBIDE TIPPED BITS: Used for drilli ng
stone, con crete, plaster, ce ment and other
unusually hard non metals. U se conti nuous
heavy feed pres sure when employing carbide
tip bits.
DRILLING WOOD
Be certain workpiece is clamped or anchored
firm ly. 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. T hen 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
pres sure 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.
Lubri cate the tip of t he bit oc casionally with
cutting oil except when drilling soft metals such
as alu minum, cop per or cast iron. If the hole to
be drilled is fairly large, drill a smaller hole first,
then enlarge to t he require d size, it’s oft en
faste r i n t he long ru n. Main tain en ough
pressure to assure that the bit does not just
spin in the hole. This will dull the bit and greatly
shorten its life.
DRILLING MASONRY
Soft materials such as brick are relatively easy
to drill. Concrete however, will require much
more pressure to keep the bit from spinning. Be
sure to use carb ide tip bits fo r all masonry
work.
Before usin g an accessory,
be certain that its maximum
safe operating speed is not exceeded by the
nameplate speed of the tool. Do not exceed
the recommended wheel diameter.
RUNNING NUTS AND BOLTS
Variable speed contro l must be used w ith
caution for driving nuts and bolts with socket
set att ach ments. The techniqu e is to st art
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.
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WARNING
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