Genesis GHD1250SE Manuel D'utilisation page 11

• Hold the drill firmly, apply moderate downward pressure and slowly pull the trigger switch.
• Keep the tool in position, preventing the drill bit from wandering. (If the hammer drill bounces or "dances"
on the workpiece, increase the downward pressure on the drill.)
• Increase the drill speed as the hole becomes established, maintaining steady and firm downward pressure.
(Do not force the tool or apply side pressure, which may cause the hole to become elongated.)
• To prevent the hole from clogging with dust or chips that bind the drill bit, occasionally pull the bit partially out
of the hole while the tool is running to help clear accumulated debris from the bit flutes. Do not use water to
settle the dust since it will clog the bit flutes causing the bit to bind in the hole.
• If the bit strikes reinforcing bar, stop the tool and remove the bit from the hole. Do not attempt drilling
through the reinforcing bar.
• When hole is drilled to the desired depth, withdraw the bit from the hole, and turn the drill off by releasing
the trigger switch.
• After drilling is completed, you may find the hole partially filled with dust. use a "blow-out bulb" or
compressed air to clean the dust from the hole. (Note: use a mask or respirator to prevent inhalation of the
dust created by drilling or clearing holes in concrete or similar materials.)
DRILLING IN WOOD, COMPOSITE MATERIALS AND PLASTICS
Although most "twist" drill bits are designed for drilling into metal, they are the most common bit used for
boring holes in wood, wood composites and plastics. There are many types of drill bits available that may be
more appropriate or designed specifically for boring the type of hole you desire. Additional drill bits to choose
from include: spade bits, brad bits, self-feed bits, hole saws, circle cutters, multi-spur bits and fastener bits,
to name just a few! Woodworking publications and tool supply store personnel are good sources to help you
select the drill bit that best satisfies your needs.
• With the tool unplugged, install the appropriate bit into the chuck and tighten the chuck.
• Place the forward/reverse switch in the forward position.
• Mark the location(s) on workpiece where the holes are to be drilled.
• Secure the workpiece with clamps or other means.
• Wear safety goggles or safety glasses with side shields. Wear a dust mask or respirator to prevent inhalation
of wood dust.
To Drill the Hole
• Plug the tool into the power source.
• Place tip of the drill bit on the workpiece where the hole is being drilled.
• Apply downward pressure and slowly depress the trigger switch.
• When using a twist drill, withdraw the bit from the hole frequently to clear built up wood chips from the
flutes. Clearing the flutes avoids overheating the bit and burning the wood.
• When drilling plastics use slower speeds to avoid melting the material.
• Reduce pressure on the drill just before the bit breaks through the workpiece to avoid splintering the
wood. ( Note: Clamping a backing block to the workpiece will keep the back of the wood from splintering.
If not using a backing block when using spade bits and hole saws, reduce pressure as soon as the bit
point breaks through the workpiece and complete drilling the hole from the opposite side.)
DRILLING IN METAL
IMPORTANT NOTE:
use good quality high-speed steel twist drill bits.
• With the drill unplugged, install the bit and perform the pre-drilling checks as stated in the preceding wood
drilling section.
• To make starting the hole easier and keep the bit from "walking" on the workpiece, use a center punch to
make a small impression in the metal. Place the drill bit tip into the impression and start the drill by slowly
depressing the trigger switch. Apply only enough pressure to keep the bit cutting into the metal.
WArNING:
to break, resulting in bodily injury. Excessive pressure will cause bits to overheat,
damaging the drill bit. Too little pressure keeps the bit from cutting, dulling the bit
edges due to excessive friction.
• If drilling large holes, first drill a smaller hole and then enlarge it to the desired size.
• using lubricants such as oil on the point will help cool the bit, increase drilling action and extend drill bit life.
• Clamp a backing block to the workpiece to prevent binding and distortion when the bit breaks through the
metal.
DO NOT FOrCE the tool. Too much pressure may cause bits
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