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[[Image:Diagram of a vonder rig.jpg|thumb|right|150px300px|Diagram of a vonder rig]]
The Vonder rig is a [[Hand auger - general|hand auger method]] method that uses a heavy tripod, a winch, and a working table. It has been used extensively in Zimbabwe and distributed widely in sub-Saharan Africa. The cutting tool (auger head) is rotated to cut into the ground, and then withdrawn to remove excavated material. This is repeated until the required depth is reached.
==History and social context==
The Vonder rig was developed in the early 80's and is manufactured in Zimbabwe.
- Slow compared with other methods.
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[[Image:Vonder rig in action.jpg|thumb|right|150px300px|Vonder rig in action]]
==Technical specificationConstruction, operations and maintenance==[[Image:Work table and auger bit.jpg|thumb|right|300px|Work table and auger bit]]
====Operation====
====Maintenance====
====Manufacturing ====
[[Image:Work table and auger bit.jpg|thumb|right|150px|Work table and auger bit]]
The Vonder rig makes use of a tripod and working table and is therefore more expensive than the conventional augering tools. However, use of the worktable and tripod ensure a straight borehole.
==Costs==
==Cost== ==Country Field experiences==
The vonder rig is widely used in Malawi, Kenya, South Africa and Zimbabwe.
==ManualsReference manuals, videos, and links==
* Self-help wells, R.G. Koegel, FAO 1985. Internet manual on hydrogeology, well constructions, all drilling techniques - [http://www.fao.org/docrep/X5567E/x5567e00.HTM website].
==Movies==
== Acknowledgements==
* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].
==External Links==
* Human-Powered Drilling Technologies, Richard Carter, Cranfield University, 2005 - An overview of human-powered drilling technologies - [http://www.rwsn.ch/documentation/skatdocumentation.2005-11-15.5533687184/file Download].
* Multi-service procedures for well-drilling operations, field manual chapter 9, US Military Chapter 9, alternative well construction, manual drilling techniques - [http://www.paulsawyers.com/pdfs/FM_5_484.pdf Download].
==ReferencesAcknowledgements==* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].
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