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OPERATION
8. If the bit jams in the workpiece or if the
drill stalls, stop the tool immediately.
Remove the bit from the workpiece and
determine the reason for jamming.
FIG. 12
WOOD DRILLING
For maximum performance, use high-speed
steel or brad point bits for wood drilling.
1. Begin drilling at a very low speed to
prevent the bit from slipping off the
starting point.
2. Increase speed as the drill bit bites into
the material.
3. 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.
METAL DRILLING
For maximum performance, use high-speed
steel bits for metal or steel drilling.
1. When drilling metals, use a 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.
2. Begin drilling at a very low speed to
prevent the bit from slipping off of the
starting point.
3. Maintain a speed and pressure that
allows cutting without overheating the
bit. Applying too much pressure will:
- Overheat the hammer drill.
- Wear the bearings.
- Bend or burn bits.
- Produce off-center or irregular-shaped
holes.
MASONRY DRILLING
For maximum performance, use high-speed
steel bits for masonry drilling.
1. When drilling in masonry, select the
hammer drill operating mode.
2. Drilling soft masonry materials such
as cinder block requires little pressure.
Hard materials like concrete require
more pressure.
3. A smooth, even flow of dust indicates
the proper drilling rate. Do not let the bit
spin in the hole without cutting. Do not
use water to settle dust or to cool bit.
WARNING:
Always wear safety
goggles or safety glasses with side
shields during power tool operation or
when blowing dust. If operation is dusty,
also wear a dust mask.
Summary of Contents for 241-0465
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