Makita 8406c Instruction Manual page 9

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Align the center bit with the center of the hole to be drilled.
Turn the tool on and drill in the concrete until the diamond
portion of the core bit has drilled to a depth of 3 - 5 mm.
This forms a pilot groove for you to follow when you
continue drilling.
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Remove the center bit from the core bit and place the
core bit back into the pilot groove. Drill the hole while
holding the tool squarely against the concrete. Do not
apply excessive pressure to the tool when drilling.
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Reduce your pressure on the tool if the core bit contacts
reinforcing bars or foreign matter in the concrete and
when the core bit begins to break through the concrete.
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To remove the core material from the core bit, point the
core bit downwards. If the core material does not fall out
of the core bit smoothly, insert a small rod into a hole in
1. Bit shank
2. Core bit
3. Center bit
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1. Center bit
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2. Center of hole
1. Pilot groove
2. Center bit
3. Core bit
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the rear side of the core bit to push the core material out.
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CAUTION:
When drilling in "green" concrete or when drilling
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downwards, dust may not be extracted through the
hole smoothly. In this case, use a dust collector to
collect the dust easily.
Hammer drilling operation
(with a tungsten-carbide tipped bit)
When drilling in concrete, granite, tile, etc. with a
tungsten-carbide tipped bit, first use "rotation only" action
to start a hole, then use "rotation with hammering" action
to continue drilling.
Do not apply more pressure when the hole becomes
clogged with chips or particles. Instead, run the tool at an
idle, then remove from the hole. By repeating this several
times, the hole will be cleaned out.
Drilling operation
(with a conventional drill bit)
When drilling in wood, metal or plastic materials, move
the action mode changing lever to the position of
symbol to use "rotation only" action.
Drilling in wood
When drilling in wood, the best results are obtained with
wood drills equipped with a guide screw. The guide
screw makes drilling easier by pulling the bit into the
workpiece.
Drilling in metal
To prevent the bit from slipping when starting a hole,
make an indentation with a center-punch and hammer at
the point to be drilled. Place the point of the bit in the
indentation and start drilling.
Use a cutting lubricant when drilling metals. The
exceptions are iron and brass which should be drilled dry.
CAUTION:
Pressing excessively on the tool will not speed up
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the drilling. In fact, this excessive pressure will only
serve to damage the tip of your bit, decrease the
tool performance and shorten the service life of the
tool.
There is a tremendous force exerted on the tool/bit
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at the time of hole break through. Hold the tool
firmly and exert care when the bit begins to break
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1. Small rod
2. Core material