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...Journal of agricultural technology vol available online http www ijat aatsea com issn computer aided design moldboard plough surface mahmoud soltani and javad taghinezhad department machinery engineering faculty university tehran karaj iran javadtaghinezhad mouldboard is an important implement widely used in primary tillage accurate bottom based on farmland soil properties essential problem therefore must be applied algorithm presented carried out matlb software d shape was plotted introduction geometric modeling cad recently many fields industry manufacture such diverse objects as aircraft cars ship hulls harvest the benefits emerging simultaneous intensive research mathematical theory representation analysis surfaces would studied aresult physical have been replaced by models this leads to better cheaper products latter are simpler analyze easier change than former dimas briassoulis one most implements world for years designing characteristics also it describe characterize three dime...