Makita DBM230 Operating Instructions Manual

Also see for DBM230: Original instructions Original instructions

24Execution 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 theforward 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 corebit in use. If the drilling speed is too high, the diamond segments willbecome blunt in short time.Inclined drilling! Remove the bolt in the foot plate, which holds the column at a 90ºangle.! Loosen the thumb screw between support and column and swivel thecolumn 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 bittouches the surface. If the drill speed or pressure is too high the drill bitmay 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 segmentsbefore you start drilling.! When drilling overhead take special care that no water enters into thetool.In case you notice during drilling that the advance speed becomes very slow, thatyou have to employ increased pressure and that the water emerging from theborehole is clear and mixed with metal splinters you probably have hitreinforcement iron.Reduce the pressure on the drill bit and switch to the next lower gear if possiblein order to separate it without problems. You may increase the pressure, and thedrill speed after separating the reinforcement.Extension of the drill bitIf 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 withoutmoving the core drilling installation.! Replace the drill bit into the drilled hole.