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The object of the present study was to manufacture and evaluate a small self propelled machine for cutting some crop residues grown during Egyptian summer season. It consists of twin saw circular discs and transmission system to transmit the rotating motion from the machine engine to the saw circular discs. This machine was constructed and evaluated to find out the optimum operating parameters for cutting cotton, maize and sunflower residues at four saw disc rotating speeds of 1500 (19.50), 1800 (23.40), 2100 (27.30) and 2500 (32.50), rpm (m/s); four machine forward speeds of 0.8, 1.0, 1.2 and 1.5 km/h and four average stalks moisture contents of 18.45, 25.15, 31.20 and 42.10 %; 29.32, 37.66, 41.26 and 53.41 % and 17.88, 23.27, 29.35 and 40.63 % for cotton maize and sunflower stalks, respectively. The obtained results revealed that: Field capacity and cutting height increased as the kinematic parameter decreased. Field efficiency and cutting efficiency increased as the kinematic parameter increased. Required power and consumed energy decreased as the kinematic parameter decreased. Kinematic parameter of 81.98 recorded minimum criterion cost. Stalks moisture contents of 31.20, 41.26 and 29.35 % considered the suitable values for cutting cotton, maize and sunflower residues, respectively.

MANUFACTURE AND PERFORMANCE EVALUATION OF A CIRCULAR SAW MOWER FOR CUTTING SOME CROP RESIDUES