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Overload Protection
In order to protect the operator, motor and drill bit, the DB 160 GR is
equipped with a mechanical and electronic overload protection.
Mechanical:
If the drill bit is suddenly blocked in the hole, a clutch will
slip disengaging the drill spindle from the motor.
Electronic:
In case of overload due to too large feed force, the motor
cuts off automatically. After discharge, switching OFF and
ON again, drilling can be continued.
Safety Clutch
The safety clutch should absorb shock and excessive stress.
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.
Fracture of Segment
If a diamond segment, parts of the armouring or something simliar break
out while drilling, and consequently the drill bit seizes, stop working on this
bore and drill a hole having the same centre and a diameter being 15 – 20
mm bigger.
Do not try to finish your work using another drill bit of the same
diameter!
After Drilling
When you have finished drilling:
Pull the drill bit out of the hole.
Stop the motor by using the motor switch and not the PRCD
switch.
Close the water supply.
Removal of the core when it sticks in the drill bit:
Separate the drill bit from the motor.
Put the drill bit in a vertical position.
Knock carefully on the pipe by using a wooden hammer shank till
the drilling core slips out. Never throw the drill bit against a wall
by force or set about it with tools, such as hammer or jaw
wrench. Otherwise, the pipe could go out of shape and neither
the drilling core can be extracted nor the drill bit is reused.
Removal of the core from blind holes:
Break off the core with a cotter or lever, or in pieces. Lift the core out with
appropriate tongs or drill a hole in the core, screw an eyebolt in and pull
the core out.
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