13
GB
torque forces. When the preset maximum torque level is reached, the clutch will slip.
After the clutch slips many times, it will become worn and slip at lower and lower torque levels.
When this happens, it must be serviced by an authorized service provider.
The recommended torque of the clutch nut is 21 Nm.
CAUTION: Always ease off the load immediately whenever the clutch slips. Do not allow the clutch to
continue slipping or it will wear out prematurely.
DRILLING INSTRUCTIONS
1. Open the water valve and very gently begin the cut. use very light feed pressure to prevent the bit
from wandering until the bit is fully penetrated into the cut.
2. Make adjustments to the water feed as needed. The water leaving the cut should be a solid colored
slurry with about the consistency of milk.
3. Once in the cut, use steady feed pressure .
4. When the bit is about to break through, reduce feed pressure .
REBAR ASSIST BUTTON
When embedded steel reinforcing is encountered, press the Rebar Assist Button. “Lo” will be displayed on the
Information Screen, and the rotational speed will be reduced. Reduce your feed pressure by about 1/3 and
let the bit go at its own pace. (If there is too much vibration, the bit can be damaged). As soon as the rebar is
passed, press the Rebar Assist Button again to return to normal operation.
ABOUT DIAMOND BITS
The diamond impregnated segments in a wet type (sintered) diamond core bit operate on a principle of
controlled erosion. The bond matrix holding the diamonds is continually worn away by abrasion with the
work piece, exposing the harder diamonds to stand proud from the bond matrix. 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 and the bit becomes dull. This is called glazing . If the bit seems to refuse to cut anymore, it is
glazed. See below: ”SHARPENING A GLAZED BIT ”
Don’t feed too gently or the diamond segments will become glazed. Keep the bit steadily working. If the
cut is very deep, the core plug may be obstructing the flow of cooling water. In this case, stop drilling, and
chisel out the core plug before continuing.
CAUTION: If the bit gets stuck, do not try to rock it loose by turning the switch 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.
CAUTION: Drilling operations are very stressful to the motor and at the end of the cut, the motor
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