Demotech, design for self reliance


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Description

Make connection between wooden parts strong, quick and easy. More complex wooden constructons become within reach of people with little recources.


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WeldingWood
<< Back to category Making made easier

Introduced at users level Hundredfold reduction of cost Applicable in modern as well as in poor economies Income Comfort Rural as well as urban.



Why
Interconnecting wooden parts in a quick and sturdy fashion. No carpentry tools, no special skill needed. Any shape in wood to be attached to any other shape in wood. About as strong as the wooden parts themselves. Comparable to modern metal construction elements to interconnect wooden beams, but to be applied with less precision .

How
Small strips of sheet metal are nailed to both wooden parts to be interconnected. The strip follows the surface of the wooden parts. The strip transfers load to the wood through a great many small nails, the indents and sharp burs, caused by the nails improve the interconnection of the sheet metal and the wood. As the sheet metal is curved and dented everywhere, buckling is less probable.
Click here for a look at the construction manual.



Additional information

Pictures taken of the crank drive of the rope pump and the rear connector of the Transport bicycle.



Planned progress



Internal links

Harvesting sheet metal

Description of how sheet metal can be recuperated from a an oil barrel. How to cut, how to flatten and how to fold.
This method proves to be easy to teach and gives accurate results.



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  • What other people say...

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    by Hans Baarslag - Fri Oct 31 (2003)
    houtverbinding
    Dear Sir I think this is a method that does not need machines,is strong,uses less wood. It follows the contour of the wood.It leaves the outerlayer of the wood more or less intact.Did you know that this part is pretensioned?One question how are the nails affecting the durability of the wood?Are stainless steel nails better?The name welding wood gives me associations of melting the wood. may be you could call it joining wood. Hans
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    by Reinder / Demotech - Thu Dec 01 (2005)
    Re: houtverbinding
    > It follows the contour of the wood. It leaves the outer layer of the wood more or less intact. No need for much peparation and a rough preparation wll do. However it is also possibe to do this with fine craftmanship and make a connection that looks beautifull. Durablity of the nails? they will rust! First this strengthens the loadability of the construction. In the end it wll destroy it. Stainless steel nails, is that normally available at a village market? Welding Wood as a word sounds nice, is easy to remember. Joining wood is too close for comfort to a joint!.

    by hans carlier - Thu Dec 01 (2005)
    to weld a wooden wheel to a wooden axe
    In Peru we made a wooden wheelbarrow from an drawing in Kenyan book. To connect the wooden wheel , made from shelves, to the wooden axle, we cut with a sharp knive a strip of thick rubber(1x1cm) from an cartyre that we nailed in two directions, as a connection between axe and wheel. Hans carlier (carlier@daxis.nl)

    by Reinder / Demotech - Thu Dec 01 (2005)
    Re: to weld a wooden wheel to a wooden axe
    > In Peru we made a wooden wheelbarrow from an drawing in Kenyan book.
    > To connect the wooden wheel , made from shelves, to the wooden axle, we
    > cut with a sharp knive a strip of thick rubber(1x1cm) from an cartyre
    > that we nailed in two directions, as a connection between axe and wheel.
    > Hans carlier (carlier@daxis.nl) Hans, can you make a sketch of this way of doing? Mail it to info@demotech.org Can you write how well it performed: wheel, axle and connection?

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    Houtverbinding, lassen van hout, hout-metaalverbinding, blik-op-hout verbinding, tin on wood connection, ....