In CUT ASSIST mode, the drilling operation starts with the core bit advancing until it is in contact with the surface to be drilled. The core bit does not rotate while this is taking place. As soon as it touches the surface, the core bit retracts a short distance.
The core bit then begins to rotate slowly (starting speed). The system switches on the water supply and drills at low speed until adequate hole-starting depth is reached. Once the required starting depth has been reached the system continues drilling at the optimum speed and with optimum power.
If the core bit touches reinforcement in the concrete, the
Iron Boost function is activated and power is adapted for cutting through the reinforcement. Weak reinforcement might not be detected by the drilling feed unit, in which case the
Iron Boost function is not activated.
When drilling a blind hole (not all the way through), the drilling feed unit stops the advance movement as soon as the carriage contacts the depth gauge.
When through holes are drilled without use of a depth gauge, the core bit feed movement continues until the core bit projects approx. 3 cm out of the exit hole.
At the end of the drilling operation, the core bit retracts until it is just inside the hole and the water flow is switched off.
At temperatures below 4 °C (39 °F), the water in the cooling circuit has to be blown out with compressed air when drilling is interrupted for more than one hour and before the equipment is stowed away.
In order for the water circuit to be drained, the diamond core drilling machine has to be connected to the electricity supply and to the drilling feed unit.
- Disconnect the water supply from the drilling feed unit.
- Open the water flow regulator on the diamond core drilling machine.
- Set the 3-way valve to Wet drilling .
- Press the Manual mode button.
- Use compressed air (max. 3 bar) to blow the water out of the water circuit.