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13
HOW TO USE THE HAMMER-DRILL
1. DRILLING CONCRETE – Use carbide-tipped masonry bits only. Be
certain to securely grip the drill in the chuck and to place the mode-
selecting knob in the “HAMMER” position. Adjust the depth gauge rod
for your desired depth. Start the drill by squeezing the trigger. Place the
tip of the bit in contact with the workpiece and apply steady, firm
pressure.
Avoid allowing the Hammer-Drill to bounce or “dance” under
its own weight. This could result in damage to both the drill bit and the
Hammer-Drill.
Take extreme care to stop the drill immediately if the bit
becomes jammed in the hole. See ADDITIONAL SAFETY RULES, Number
13.
2. DRILLING WOOD – Be certain to securely grip the drill in the chuck and
to place the mode- selecting knob in the “DRILL” position.
Hold the workpiece securely in a vise or clamp it in place prior
to starting the drilling operation. Loose work may spin and cause bodily injury.
Start the drill by squeezing the trigger. Place the tip of the drill in contact
with the workpiece and apply pressure. When you use twist drills in wood,
withdraw the drills from the hole frequently to clear chips in the flutes to
avoid overheating and burning the workpiece. Reduce the pressure on
the drill just before the bit cuts through the workpiece to avoid splintering
the wood.
If a backing block is used to keep back of wood from splintering, clamp it
securely in place. If a backing is not used with spade bits or hole saws,
ease up on the pressure as soon as the bit point breaks through
workpiece. Complete the hole from the opposite side.
3. DRILLING METAL – Use only good quality high speed steel twist drills.
Be certain to securely grip the drill in the chuck and to place the mode-
selecting knob in the “DRILL” position.
Hold the workpiece securely in a vise or clamp it in place prior
to starting the drilling operation. Loose work may spin and cause bodily injury.
For easy starting and to prevent the drill bit from “walking”, use a center
punch to make a small impression in the metal. Start the drill by
squeezing the trigger. Place the tip of the drill bit in the impression and
exert just enough pressure for the bit to cut.
DO NOT FORCE. Too much pressure may cause the bit to
break or overheat, resulting in bodily injury or damaged drill bits. Too little
pressure will keep the bit from cutting and will dull the edges.
When drilling a large hole, first drill a smaller hole and then enlarge it to the
required size. The use of a lubricant (oil) on the drill point will help to keep the
bit cool, increasing drilling action and prolonging drill bit life.