virginia abraives VA-CD3, Operating Manual

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FIGURE 3
4
3. Handling Instructions
1) Core bit installation:
Thread the core bit (by hand) onto the threaded drive of the drill. Use a wrench to
secure the core bit.
2) Check the voltage:
Make sure the voltage of the power source is the same as required on the
nameplate of the tool. The voltage should be kept at +/-5%.
3) Cutting bit installation:
Install the diamond core bit carefully. The end thread shall match with the end
output shaft. Apply a small amount of grease to the output shaft prior to
installation of the core bit. Install the bit by hand and tighten securely using a
wrench. After tightening the core bit, allow the drill run under no-load for one
minute prior to using.
4) Ensure proper water supply:
A reliable water supply is required for proper core bit performance. The water
flushes slurry created during the cutting process from the cutting area and cools
the core bit.
5) Drilling a core:
Open the water valve. Start the drill under no-load conditions. When water begins
to flow you can begin the drilling process. When drilling with a portable drill, angle
the drill to a slightly inclined angle (See fig. 1). Drill a crescent-shape notch on the
surface of the concrete. Continue drilling while adjusting the drill to the desired
drilling angle. Increase pressure when the drill bit is into the work piece about
¼”depth. Drill slowly and uniformly. Do not use excessive force. Apply moderate
pressure and allow the tool to do the work. During drilling, if the speed of motor is
reduced significantly, this indicates an excessive load. Reduce the pressure
accordingly to maintain normal operating speed. If the motor overheats, shut off
the drill immediately. Allow the motor to cool down.
6) Drilling though re-bar:
When encountering re-bar in the slab, the clutch on the output shaft may slip and
the GFCI may trip if the drill is forced into the steel reinforcement bar. It is normal
for the cutting progress to slow when drilling through re-bar. Forcing the drill will
damage the drill and the core bit. Allow extra time for drilling through re-bar.