Raiseboring Tools
Pilot bits, stabilisers, drill rods, reaming heads and cutters for raiseboring ventilation shafts, ore passes and access raises.
Features
- A raise is drilled in two stages: a pilot hole down to the lower level, then a reaming head pulled back up through it.
- Cutter selection follows rock strength and abrasiveness, and cutters are inspected at every rod change because a failed cutter damages the head saddle.
- Pilot hole deviation decides whether the reaming head can be coupled at all, so stabilisers are part of the string rather than an option.
- Reaming head diameter is built up from a base head with cutter rings, which lets one head serve more than one raise diameter.
- Rod handling and thread cleanliness matter: the string is in tension while reaming, and a damaged thread means a dropped head.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Pilot hole diameter | 229 - 349 | mm | Matched to rod and reaming head. |
| Raise diameter | 700 - 3 000 | mm | Head size and cutter count. |
| Cutter type | carbide insert / milled tooth | Rock strength and abrasiveness. |