Wet Drilling - RIDGID HC-2 Operating Instructions Manual

The bits that should be used are 1/2" BSP (F) bits for dry drilling.
There are two rangesavailable.
For dry drilling we recommend the use of a pilot drill system (See
Fig. 3).
Use slow speeds in order to safely introduce the core bit in the
material (5-10 mm). The pilot drill may now be removed and
high speed can be used. When drilling, regularly retrieve the
core bit to clear the dust and debris.
For dry drilling the dust extractor only (58616) must be used
(Fig. 4).
Cause and effects when dry drilling
Cause
Drilling speed (rpm)
too low.
Drilling speed too fast.
Cutting debris and
drilling dust is not
cleared regularly.
Excessive pressure is
applied.
Insufficient feed
pressure.

WET DRILLING

The HC-2(W)/RB-3(W) is equipped with a protective Cut-Out
Device (PRCD). This device must be connected and operating
correctly before attempting any drilling with water.
2
Effect
Diamond bit does not drill. The
core glazes and eventually stops
drilling.
Diamond bit glazes, polishes and
penetrates slowly. Eventually it
stops drilling and starts melting.
It needs redressing.
The drilling dust cannot escape.
It builds up between the side
of the borehole and the wall of
the core bit. It creates heat and
friction. The core bit will jam and
overheat. Use dust extractor!
The core bit does not have time to
drill. The segments glaze.
The core bit does not cut
but polishes. Core bit needs
resharpening. If not resharpened
in time it will heat up and
ultimately melt or segment loss
occurs.
Important! test unit (the cut-out device) before each use
- Plug unit into power supply socket.
- Press reset to switch on unit. Red indicator will show.
- Press test button: Unit must switch off and indicator will be
black.
Do not use machine if unit does not switch off when test
button is pressed.
- Press reset to use equipment.
- If unit switches off repeatedly do not use and have the
equipment inspected by a RIDGID service center.
Note: Unit switches off and must be reset after power has been
disconnected. Connect the water hose to the water inlet on the
machine. Adjust water flow with tap. Be sure to use enough wa-
ter (4-5 l/min).
Core bits
The core bits that are used to drill wet are wet bits 1/2" (M).
- For handheld drilling we strongly recommend to use full
crown core bits.
- For drilling with stand (cat 59016) segmented bits can be
used.
To mount a 1/2" (M) core bit on the HC-2 W / RB-3 (W)the adapter
1/2" F - 1/2" F is used (included in standard equipment HC-2 W /
RB-3(W), see Fig. 4).
For wet drilling with HC-2 use the kit for wet hand drilling (Cat. no.
52596). This kit is standard equipment with the HC-2C.
Cause and effects when wet drilling
Cause Effect
Insufficient water. Excessive diamond wear because the
diamonds are inadequately cooled
and the material being drilled does
not get washed away. Ultimately the
segments will melt or segment loss
will occur.
Excessive water. The segments do not get
resharpened, they start polishing. The
result will be good diamond bit life
but slow drilling speed.
Drilling speed too The diamond segments grind
slow. rather than cut. The result is slow
penetration and short bit life.
Drilling speed too The diamond segments are polishing
fast. and glazing. Penetration is slow and
ultimately the diamond bit will stop
penetrating.