EIBENSTOCK EBM 250/2 RP Original Instructions Manual page 9

Insert a dowel and open it with an expanding mandrel.
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Screw the thread rod into the dowel.
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Put the drilling unit with the deep hole in the base onto the thread rod.
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Place the washer and screw the butterfly nut very tightly.
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Adjust the drilling unit in the platform by using the four screws.
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Vertical drilling
Switch the PRCD on.
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Open the water supply.
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Switch the motor on without touching the surface with the drill bit.
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Turn the handle to bring down the drill bit until it contacts the surface.
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In order to reach an exact centring of the drill bit, keep the feed low
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for the first centimeter of cutting depth.
Then you can drill faster. A too small drilling speed reduces the
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power. On the other hand, when the drilling speed is too high, the
diamond segments quickly become blunt.
Angular drilling
Remove the screw in the foot base which arrests the column at 90°.
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Loosen the two screws on the base of the column and turn the

column to the requested angle.
Retighten the screws again.
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At the beginning, it is better to drill very slowy because the bit only
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meshes with a fraction of its cutting area with the material. If you drill
too fast or with a pressure which is too high, the bit can be off centre.
You have hit reinforced iron when you recognise while drilling that the feed
rate gets very low, when you need to use more force, or when the water
leaking from the bore hole clearly shows some metal chips.
Reduce the pressure on the drill bit to cut through the reinforced iron
without any problems. You increase the pressure again when you have cut
through the reinforced iron.
Drill bit extension
If you have to drill deeper than the usable length of your drill bit is:
First, only drill to the point the usable length of the bit reaches.
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Remove the bit and pull the centre core out of the hole without
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moving the core drilling unit.
Push the drill bit back into the bore hole.
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Screw an adequate extension between drill bit and motor. If the collet of
the drill bit is 1 ¼", please do not forget the copper rings which make the
removal of the drill bit easier.
Drilling
9