Chain shot—clear road ahead for development and testing of shot guards
Louise Johansson, Ulf Hallonborg & Paul Granlund, Skogforsk
Thanks to a newly developed test rig that resembles a harvester head, it is now possible to generate chain shot at will. The rig constitutes a valuable tool for use in the development and testing of guards to protect against life-threatening chain shot in the woods.
When a harvester saw chain fails, links or rivets or other bits of the chain are sent flying. These are highly dangerous as the kinetic energy they carry can be equivalent to that in a bullet from a sporting rifle.
In the past, chain shot was seen as a random event and one that was therefore difficult to prevent. However, as a result of a collaboration between Skogforsk and the Swedish Machinery Testing Institute, we now not only know what causes chain shot but are also able to predict the direction in which the missiles will travel. Such knowledge is extremely valuable in the work of developing chain-shot guards.
The experts believe that it should be relatively easy to design a device that will arrest chain shot in a backward direction, but much more difficult to deal with chain shot in the forward direction. However, chain shot in the forward direction is far less likely, as the chain seldom becomes trapped on the top of the guide bar alone.
This publication is a Swedish edition with a short summary in English.
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Resultat No. 4, 2004
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Pris
: 80 kr
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