Caldwell Rig
The California Welding Co. in the USA produced our large diameter 250B Caldwell Piling Drill with teeth around the bottom of a heavy cylindrical steel bucket. As the drill rotates, the teeth cut into the rock below, breaking it up and forcing lumps into the bucket which has a flap underneath to hold the dirt while it is raised to the surface. At the surface, the bucket is swung away from the shaft collar using a winch before the flap is opened to release the dirt.
Shaft diameter range is 460mm to 2.3metres (depending on ground conditions) with depths up to 24metres. Normal bulk sample holes are 930mm in diameter, at one metre depth of most soil types.
- Soakage Pits
- Offal Pits - Otago/Southland
- Large Waterbores 12inch (300mm) - 39inch (1000mm) diameter
- Development of Waterbores
- Bulk Sampling
- Cased Piling Bores
Speight Drilling specialise in soakage pits, offal holes and waterbores all over Central Otago and the Southland areas.
Our highly skilled Senior Driller Dave Aburn has over 30 years practical experience and customer satisfaction.