Borehole position indicator for quarries
The indicator is a valuable saver of time and drill bits.
It is used when two boreholes are drilled, at right angles to one another, to meet inside the rock. The technique is normally used when a sawing wire is to be passed through. The two holes are drilled, and if they fail to meet, a probe is pushed into each as far as the point where they cross. The display shows which is higher, and gives an indication of the distance between the two boreholes. The probes are then removed, and another hole is bored. The tool is particularly valuable in rock where the drills do not run straight.
The probes are designed for boreholes of diameter 100mm or larger. As well being used in horizontal boreholes, they can be used where one of the boreholes is vertical.
Please ask for more details.
Hazel Hall, Torver, Coniston, Cumbria, LA21 8BU, England tel (0) 15 394 41437