Abstract
A leader cable guidance system for a 9 m span experimental gantry running on crawler tracks has been designed and evaluated, both theoretically and practically. The system is described and the theory behind the control of this machine explained. Field trials have shown that the path of the experimental gantry is consistent over repeated passes under automatic control to ±60 mm. These results confirm the predictions of a computer model which shows that further improvements could be made at modest cost. The use of straight line automatic guidance and control of a commercial field gantry is discussed and economic aspects considered. It is concluded that such a system can be economically viable for intensive field vegetable production.
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