User Manual

11
well.
7. When the cut is finished keep the
motor running until the bit is removed
from the cut to avoid it getting stuck.
Then release the switch, allow the
coasting bit to stop, shut off the water
supply and finally set the machine
down.
WARNING: When coring through a floor, the
core will fall down. Take precautions to
avoid injury or damage below.
NOTE: When cutting with a new bit for the
first time, use less than normal feed
pressure for a time until it breaks in.
●DIAMOND CORING AND WATER
The diamond impregnated segments in a
diamond core bit operate on a principle of
controlled erosion. The bond matrix holding
the diamonds is continually worn away by
abrasion with the concrete, exposing the
harder diamonds to stand proud from the
bond matrix. A bit with good diamond
exposure is a sharp bit.
This erosion process causes heat and
particles, which require water to cool and
rinse free. Without adequate water, the bit
would overheat and be destroyed.
With too much water and not enough feed
pressure, there would not be adequate
erosion of the bond matrix (the diamonds
not exposed) and the bit becomes dull
(diamond segments polish smooth). This is
called glazing. If the bit seems to refuse to
cut anymore, you know that it is glazed.
See below.
●RESHARPENING A GLAZED BIT
If you find the bit to be glazed, first reduce
the water flow until the water exiting the
cut is really muddy. If that still does not work
to sharpen the bit, stop and add a 1/4” of
coarse silica sand into the kerf and drill for a
few minutes, then turn up the water to rinse
the sand free. Repeat as needed.
●VIBRATION TROUBLESHOOTING
If vibration occurs and it is not caused by
embedded steel, stop drilling to find the
cause and remedy.
CAUTION: Do not operate with vibration or
there will be serious hazard and the
diamond core bit will surely be destroyed.
Vibration is usually caused by:
1. A bit with too much runout
SOLUTION: Replace bit.
2. A bit with diamond segments broken
off
SOLUTION: Replace bit.
3. A loose rig, shifted mountings or loose
gibs (applicable to the optional rig
only) SOLUTION: Retighten mountings
or adjust gibs as needed.
● KEEP TOOL CLEAN
Periodically blow out all air passages with
dry compressed air. All plastic parts should
be cleaned with a soft damp cloth. NEVER
use solvents to clean plastic parts. They
could possibly dissolve or otherwise
damage the material.