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Hand auger - Vonder rig

186 bytes added, 02:42, 17 July 2012
→‎Suitable conditions
The Vonder rig is suitable for unconsolidated formations: sand, silt and soft clay. Stiff clays, hard materials and gravels are difficult or impossible to drill through and to remove (unless augering is combined with [[percussion - general|percussion]]).
 {{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Vonder rig ensures a straight borehole<br>| convalign= "top" | - Tools for vonder rig are more expensive than conventional hand augering tools<br>- Slow compared with other methods.<br>}|}
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