15
KNOW YOUR PRODUCT
Core drilling tips
• After tightening the diamond core bit connect the core drill to the power supply
and lightly press the variable speed trigger (11) to check that the diamond core
bit is rotating evenly.
•
Gently drill at a low speed until the core penetrates the surface approx.. 5-10mm
deep. If holding by hand, start the cut by approaching at an angle of about 30
degrees to the cutting surface. (A large piece of wood with a large V notch cut
in it will help prevent the bit from wandering at the beginning). Once about a
third of the arc is cut, straighten the bit to the correct perpendicular angle while
keeping enough feed pressure on the bit to prevent it from wandering. If using a
rig, use a very light feed pressure to prevent the bit from wandering until the bit
is fully penetrated into the cut.
• Reduce the drill speed just prior to the core bit breaks through the workpiece,
the bit will be very liable to get stuck. When breaking through, hold the machine
tightly and reduce feed pressure.
•
It is recommended that a lower speed should be used when drilling with larger
core bits.
• After shutting down and switching off the power supply, remove the core bit.
• Clean core bit with clean with water after use.
WARNING!
Keep the motor air vents free of dust to maintain ventilation
and proper cooling of the motor.
WARNING!
If the bit gets stuck, do not try to rock it loose by turning
the variable speed trigger (11) on and off. That is hazardous and could
damage the motor. Rather, unplug the machine and use a wrench on the bit
mounting to work it loose.
OPERATION (cont.)
