16
8.1.3 Others
Ensure that the following portions are firmly installed;
a) Base and the surface of the material to be drilled.
b) Column and carriage block.
c) Carriage block and drill motor.
Ensure that power cord, water hose, and operator's protective clothing are not touching the core
bit.
Ensure that the air inlet of the drill motor which is located on the top side of the motor is not
blocked. Insufficient cooling may lead to damage of the motor.
Ensure that any adjusting keys, wrenches, and spanners are not attached to the machine before
starting the operation and while in operation.
8.2 Operating procedure
8.2.1 Start drilling
DANGER
Ensure that the operator (s) stand firmly, and keep people away from the working area
before starting.
For penetration works, ensure to have proper protection for the operators as well as the
people and property at the opposite side of the wall or down floor.
Keep your hands and other body parts away from rotating parts while the drill motor is
running.
Do not apply too much pressure to the feed handle at the start of drilling. Rapid start of
drilling may shatter segments of the core bit and the pieces may cause injuries. Gradually
increase the pressure until stable feeding rate.
Do not touch the metal parts of the feeding handle except the ball knob(s). It may cause
electric shock and pinching fingers.
Follow the procedure below.
1) Insert the plug into the power outlet via a PRCD, GFCI or RCD.
For the use of a PRCD, GFCI and RCD, refer to the clause 6.2.
2) Open the water cock to start supplying water.
3) Turn on the main switch to start the drill motor.
4) Loosen the stopper-knob, and start feeding the carriage block by turning the feed handle until the
core bit contacts with the drilling surface.
5) When the tip of the core bit comes into contact, apply only light pressure until the segments of core
bit completely get into the material. Then, gradually increase the pressure until stable feeding rate.
8.2.2 Restart after the circuit protector trips
WARNING
The main switch still remains at ON (I) position even after the drill motor is forced to shut off
due to situations such as the electric power failure. To avoid unintentional restart of the motor,
ensure to turn off (0) the main switch immediately, after the motor is forced to shut off.
This drill motor is equipped with a circuit protector to protect the motor. The circuit protector trips when
it detects overcurrent during the operation.
To restart the drill motor, turn on the main switch again. Adjust the feed pressure so that the circuit
protector does not trip.
8.2.3 Core bit jamming
WARNING
Make sure the drill motor is switched off and disconnected from the power supply.
If the core bit is jammed, follow the procedure below to remove the concrete core before restarting the
drill motor.
1) Close the water cock to stop water supply.
2) Unplug the drill motor from the power supply.
3) Remove the concrete core.
4) Insert the plug into the power outlet via a PRCD, GFCI or RCD again.
For the use of a PRCD, GFCI and RCD, refer to the clause 6.2.
5) Open the water cock to start supplying water.
6) Turn on the main switch to restart the drill motor.
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