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Percussion drilling

33 bytes removed, 05:25, 22 September 2013
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==Suitable conditions==
[[Image:Percussion drilling in action.jpg|thumb|right|250px200px| Percussion drilling in action]][[Image:Weighted drill bit.jpg|thumb|right|250px200px| Weighted drill bit]]
Percussion drilling is suitable for unconsolidated and consolidated formations: Sand, silt, stiff clays, sandstone, laterite and gravel layers.
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! width="50%" style="background:#efefef;" | Advantages
! style="background:#ffdeadf0f8ff;" | Disadvantages
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| valign="top" | - Unlike any other drilling method, percussion can remove boulders and break harder formations, effectively and quickly through most types of earth. <br>
==Construction, operations and maintenance==
[[Image:Diagram of percussion drilling.jpg|thumb|right|250px200px| Diagram of percussion drilling]]
Equipment is commercially produced in western countries. Local production is possible. Percussion drilling is hard work. Use of a small engine may be appropriate.
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