Makita DBM230 Betriebsanleitung Seite 25

Execution of drilling
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Inclined drilling
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Overhead drilling
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In case you notice during drilling that the advance speed becomes very slow, that
you have to employ increased pressure and that the water emerging from the
borehole is clear and mixed with metal splinters you probably have hit
reinforcement iron.
Reduce the pressure on the drill bit and switch to the next lower gear if possible
in order to separate it without problems. You may increase the pressure, and the
drill speed after separating the reinforcement.
Extension of the drill bit
If you have to drill deeper than the working length of the drill bit permits:
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Switch the GFCI to ON.
Open the water supply.
Switch the motor ON, the drill bit must not yet touch the surface.
Lower the drill bit until it touches the surface.
In order to achieve an exact centering of the drill bit, minimize the
forward travel of the drill bit during he first centimeter of cutting depth.
Now you can increase the drilling speed to the correct speed for the core
bit in use. If the drilling speed is too high, the diamond segments will
become blunt in short time.
Remove the bolt in the foot plate, which holds the column at a 90º
angle.
Loosen the thumb screw between support and column and swivel the
column to the desired angle.
Tighten the two bolts again.
At the start of drilling, use low drill speed as only a portion of the drill bit
touches the surface. If the drill speed or pressure is too high the drill bit
may become erratic.
You must install a water extracting device.
Connect a wet vacuum to the extracting device and switch it on.
Open the water supply and ensure that the water reaches the segments
before you start drilling.
When drilling overhead take special care that no water enters into the
tool.
At the outset, drill only as deep as the working length of the bit permits.
Remove the drill bit and take the drill core out of the drilled hole without
moving the core drilling installation.
Replace the drill bit into the drilled hole.
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