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Percussion - Stone hammer

173 bytes added, 02:50, 17 July 2012
→‎Suitable conditions
Manual percussion drilling is generally used for tube wells of 2" to 5" diameter up to depths of 25 meters.
 {{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - The Stone Hammer can be used in combination with other drilling tools when gravel or a hard layer is encountered. <br>
- Stone hammer wells are cheaper to drill than machine drilled wells: due to input of local labour ($600 versus $1500).<br>
- Stone hammer wells are much simpler, less maintenance problems (No “high-tech” parts like carburetor, gearbox etc.) compared to machine drilled wells.<br> | convalign= "top" | - It is difficult to remove the drill bit after it has been hammered into the formation. <br>
- The stone hammer is only successful when larger boulders are not encountered. <br>
- It is slower than machine drilled wells. |}} 
[[Image:Stone hammer drilling in action.jpg|thumb|right|250px|Stone hammer drilling in action]]
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