1 Product sheet Manual well drilling Stone-hammer and Rota-sludge for harder soils In addition to the existing methods for manual drilling, Practica has developed a drilling … … consisting of the Rota-sludge and Stone-hammer. The Rota-sludge scrapes and hammers lightly, while the Stone-hammer hammers with considerable force. The Rota-sludge is used for soft and semi consolidated soils. the Stone- hammer for harder soils and boulders. The Rota-sludge is based on the sludge or hand percussion method as practised in …

Stone-hammer and Rota-sludge for harder soils In addition to the existing methods for manual drilling, Practica has developed a drilling package consisting of the Rota-sludge and Stone-hammer. The Rota-sludge scrapes and hammers lightly, while the Stone-hammer hammers with considerable force. The Rota-sludge is used for soft and semi consolidated soils. the Stone- hammer for harder soils and boulders. The Rota-sludge is based on the sludge or hand percussion method as practised in India but modified to allow drilling through semi consolidated materials such as sandstone or lava. How it works Rota- sludge The equipment consists of a column of 2 inch pipes, screwed together, with a cutter on the bottom end. This pipe column is lifted by a lever and dropped down sharply to hit the bottom of the well. A handle is attached to the pipe and at the moment of impact the pipe is turned Rot a sludge drilling about 45 degrees. The cutter at the bottom is provided with teeth, which scrape away soil. So there is a hammering and scraping action. When the pipe column is lifted, the driller closes off the top of the pipe and opens it at the beginning of the downstroke. Because the well is kept full of water, this closing and opening at the right moment, causes the water to be pumped up through the drilling pipe. The water flow carries the cuttings with it. To seal off the walls of the well, to prevent caving-in and facilitate the transport of cuttings, cow-dung is added to the water. This makes a sludge, hence the name Rota- sludge. Stone-hammer When boulders or hard clay are encountered, the Stone- hammer can be used. The hammer is a closed piece of pipe with an open-ended drill bit at the bottom. In the pipe a weight (hammer) is activated with a rope from the surface. Lifting and dropping the hammer drives the Stone-hammer drilling drill bit down. When 60cm has been drilled, the unit is pulled up to the surface to empty the hollow drill bit…

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