• Inclining the column
Unscrew the clamping screws .
Incline the columns to the desired angle .
Maximum inclination 30°.
Screw up the clamping screws.
• Check the drill is tightened on the shaft.
• Check that the pressure and the flow
through the central spray are adequate for
lubrication.
Do not run the machine off load
without a water supply (this will
damage the seals on the spray head).
• Select the rotation speed appropriate for
the bore diameter.
• Turn the motor on (avoiding contact with
the material to be drilled).
• Using the wheel, bring the rotating drill
slowly into contact with the material to be
drilled without exerting undue pressure.
Boring the first centimetre is extremely
critical and should be considered as the
centring of the drill (exerting too much
force will displace the drill sideways
causing friction between the drill tube and
the material which will increase as the
depth increases).
• When the drill has been centred, increase
the drilling force to obtain the correct
penetration speed. Insufficient force will
cause the diamond to become polished
and thus lose its cutting ability, whereas
too great a force will dislodge the diamond
and result in excessive wear.
Note :
When cutting through reinforcing, reduce
the force on the drill as the cutting speed
in steel is less than that in concrete.
• If the initial rotation speed is high in
relation to the diameter of the drill, the
rotation speed should be reduced when
cutting through reinforcing.
• The drill wear depends mainly on the
density of the reinforcing being drilled, the
abrasiveness of the concrete, the type of
aggregate, the ratio of the drill diameter to
the diameter of the reinforcing bars and
the motor power used.
• When boring certain porous or cracked
materials or when boring intersecting
holes, all the water spray disappears into
the material and no water will be seen
running out of the bore hole. In this case,
use the maximum water flow to be sure of
cooling and lubricating the drill.
• Always ensure that the water flow is
sufficient so that the slurry remains fluid.
The slurry, and therefore the drill, should
never become warm.
9
End of boring
• When boring is finished, either when the
drill emerges on the other side or the bore
depth is reached (blind bores) :
stop the motor,
keep the water running,
use the wheel to remove the drill,
at the end of travel, turn off the water.