－11－
７．Core drilling
1) Turn switch off and plug in.
2) Turn on a water tap and open water cock slowly, adjusting water flow.
3) Turn switch on to drill with feeding handle. Start drilling by turning feeding handle slowly until core
bit comes 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.
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.
WARNING
When drilling a through-hole, take proper measures to provide for protection on the other side
where core bit penetrates.
WARNING
To prevent accidental starting, make certain that motor switch is in OFF position before
plugging your machine.
WARNING
1. If motor is switched on with bit resting 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.
CAUTION
Allow water to flow at about 2L per minute.
