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Then you can drill faster. A too small drilling speed reduces the
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°.
Loosen the two screws on the base of the column and turn the
column to the requested angle.
Retighten the screws again.
At the beginning, it is better to drill very slowy because the bit only
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.
Remove the bit and pull the centre core out of the hole without
moving the core drilling unit.
Push the drill bit back into the bore hole.
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.
Overload Protection
In order to protect the operator, motor and drill bit, the PLD 450 AS is
equipped with a mechanical overload protection.
If the drill bit is suddenly blocked in the hole, a clutch will slip disengaging
the drill spindle from the motor.
Safety Clutch
The safety clutch should absorb shock and excessive stress. It is an aid
and not an absolute protection. Therefore you have to handle and drill
carefully. To keep it in good condition, the clutch should slip for a very
short time (max. 2 seconds) in each case only. After excessive wearing
the clutch has to be renewed by an authorized service shop.
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