User Manual

10
1. Squeeze the trigger switch to turn the machine on. (For wet drilling models, press the "Reset" button on
the PRCD interrupter device to engergize the circuit to the machine before starting.)
WARNING: Hold the machine tightly with both hands to counteract the torque reaction force when
the bit begins to turn.
2. Very gently begin the cut. If holding by hand, start the cut by approaching at an angle of about 30
degrees to the cutting surface. (A large piece of wood with a large V notch cut in it will help prevent the
bit from wandering at the beginning.) Once about a third of the arc is cut, straighten the bit to the correct
perpendicular angle while keeping enough feed pressure on the bit to prevent it from wandering.
(If using a rig, use very light feed pressure to prevent the bit from wandering until the bit is fully
penetrated into the cut.)
3. (For wet drilling models): Make adjustments to the water feed as needed. The water leaving the cut
should be a solid colored slurry with about the consistency of milk. If the exiting water is clear, then you
may reduce the water flow. If the exiting water is thick and muddy, then increase the water. It’s
very important that the water has enough pressure to flush cutting debris out of the cut.
4. Once in the cut, use steady feed pressure .
5. When the cut is almost finished and the bit is about to break through, the bit will be very liable to get
stuck. Take extra care gripping the machine tightly and reduce feed pressure at this point.
WARNING: Whenever drilling by hand, always hold the drill in a position so that you can resist the
considerable twisting forces created when the bit grabs. Never operate without the side handle tightly
in place.
WARNING: When the bit grabs, the machine will always twist in
the counterclockwise direction. If you are drilling into the floor,
make sure that the side handle is in front of your left leg, never
between your legs.
WARNING: Always keep your face away from the machine.
Arrange the power supply cable with minimal slack and oriented in
such a way that if the machine gets out of control and spins, it will
immediately unplug its own cable.
ADDITIONAL SPECIAL INSTRUCTIONS FOR WET DRILLING
The diamond impregnated segments in a wet type (sintered) diamond core bit operate on a principle of
controlled erosion. The bond matrix holding the diamonds is continually worn away by abrasion with
the work piece, exposing the harder diamonds to stand proud from the bond matrix. A bit with good
diamond exposure is a sharp bit.
This erosion process causes heat and particles, which require water to cool and rinse free. Without
adequate water, the bit would overheat and be destroyed.
With too much water and not enough feed pressure, there would not be adequate erosion of the bond
Right
Wrong