Manual Makita DBM230 (page 25 of 82) (English, German, Dutch, Danish, French, Italian, Portuguese, Spanish)

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Execution of drilling

! 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.

Inclined drilling

! 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.

Overhead drilling

! 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.

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:

! 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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Makita DBM230 Manual

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