－10－
7
．
Core drilling
WARNING
When drilling a through-hole, take proper measures to provide for protection on the
other side where core bit penetrates.
1) Turn switch off and plug in.
WARNING
To prevent accidental starting, make certain that motor switch is in OFF position before
plugging your machine.
2) Turn on a water tap and open water cock slowly, adjusting water flow.
CAUTION
Allow water to flow at about 2L per minute.
3) Press green ON button of PRCD and then turn switch on. Start drilling by turning
feeding handle slowly until Core Bit in light contact with work surface. While starting
to drill, apply light pressure on feeding handle until drill bit penetrates to 5-10mm
depth. Then keep drilling under uniform pressure.
WARNING
1. If motor is switched on with Core Bit contacts on the work surface, it causes Core Bit
fracturing or Core Drill failure, resting in hazardous accidents.
2. Wait until the rotation of Core Bit increases to the full and then start drilling.
3. Since drill bit often wanders at the starting, turn Feeding Handle slowly applying light
pressure to prevent bit wandering. Allow water to flow at about 2L per minute.
8.After completion of drilling
1) Remove water hose and Water Collector.
2) Remove Core Bit.
3) Remove Drill Head from Pole Base.
4) Loosen hex. nut and dismount Pole Base.
