• Drilling speed too fast.
• Diamond bit glazes, polishes and
penetrates slowly. Eventually it stops
drilling and starts melting. It needs
redressing.
• Cutting debris and drilling
dust is not cleared regularly
• 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!
• Excessive pressure is applied.
• The core bit does not have time to drill.
The segments glaze.
• Insufficient feed pressure.
• 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.
WET DRILLING (HC-2 W MACHINE)
The HC-2 W is equipped with a protective Cut-Out Device (PRCD). This device must be
connected and operating correctly before attempting any drilling with water.
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 water (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 the HC-2 stand (cat 59016) segmented bits can be used.
To mount a 1/2" (M) core bit on the HC-2 W the adapter 1/2" F - 1/2" F is used (included
in standard equipment HC-2 W, see Fig. 4).
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 slow.
• The diamond segments grind rather than cut.
The result is slow penetration and short bit life.
• Drilling speed too fast.
• The diamond segments are polishing and
glazing. Penetration is slow and ultimately the
diamond bit will stop penetrating.
PROBLEM SOLVING DRY AND WET DRILLING
1. Diamond core does not cut
- Core is glazed or not sufficiently dressed: redress with sharpening stone.
- Problem with bit or machine: check and replace when necessary.
2. Diamond drill does not cut or drills too slowly:
- RPM too high or too low: check speed.
- Insufficient feed pressure.
- Diamond bit is glazed or polished: use sharpening stone.
- When dry drilling: material is too hard to drill dry.
- When wet drilling: a lot of steel is being drilled: continue slowly, give the core bit the
time to drill through the steel.
3. Diamond core jams in the hole
- Operator is not holding the drill straight enough.
- The drilling debris is not cleared regularly and is jamming the core bit: use dust
extractor.
- Diamond bit is bent (damaged): check and replace.
- Wet drilling: inadequate water supply.
- Motor clutch set is worn out: replace.
4. Diamond core is wearing too quickly
- Incorrect drilling speed: check RPM. Try next faster speed.
- Excessive feed pressure: reduce force.
