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[[Image:icon_stonehammer.png|right]]
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The Stone Hammer is a form of [[Percussion - general|percussion drilling]], used when boulders or hard clay is encountered. A hollow drill bit is attached to a hammering tool. The hammering tool consists of a heavy weight which moves up and down in a pipe. Once the bit and hammering tool are lowered into the borehole by a cable, the same cable can be used to do the hammering. Lifting and dropping the hammer drives the drill bit down. When 60cm has been drilled, the unit is pulled up to the surface to empty the hollow drill bit. The stone hammer is only successful when boulders are encountered, not in homogeneous or solid stone layers were displacement of the material is not possible.
- It is slower than machine drilled wells.
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[[Image:Stone_hammer_well_drilling.PNG|thumb|right|250px|The Stone-hammer in India, drilling a 20 m deep well in a stony layer ]][[Image:Stone hammer drilling in action.jpg|thumb|right|250px|Stone hammer drilling in action]][[Image:Emptying the drill bit.jpg|thumb|right|250px|Emptying the drill bit]][[Image:percussion gouge.jpg|thumb|right|250px|percussion gouge]]
Compared to hand-dug wells, the Stone Hammer has the following advantages:
* Some 40 % cheaper ( $600 versus $1000 for a 20 meter well).
