Makita DBM230 Original Instructions Manual

Also see for DBM230: Operating instructions Original instructions

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 thesegments before 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,that you have to employ increased pressure and that the water emerging fromthe borehole 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 ifpossible in order to separate it without problems. You may increase thepressure, and the drill 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 holewithout moving the core drilling installation. Replace the drill bit into the drilled hole.Install an appropriate extension between drill bit and motor. If the drill bitholding fixture is 1¼ " do not forget to install the copper rings in order tofacilitate the loosening of the drill bit.

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