The aim of this research is to study some physical and mechanical properties of cantaloupe, as promising fruits, to help the design of handling machines. The physical and mechanical properties are incorporated in the development of the seed-extraction machine as a case study. The main results in this study can be summarized as follows: Physical properties of cantaloupe fruits: diameter = 82.12 -113.51 mm, height = 82.07 -119.95 mm, mass = 329.2 -940.6 g, volume = 380 -860 cm 3 , projected area

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... 85.85 -160.95 cm 2 , real density = 0.69 -1.08 g/cm 3 , bulk density = 0.51 g/cm 3 , sphericity = 0.88 -1.07. Mechanical properties: the average of cantaloupe-fruit firmness was 62.5 N/cm 2 , the maximum = 80.4 N/cm 2 and the minimum = 28.6 N/cm 2 . The physical and mechanical properties are incorporated in the design of the cantaloupe-fruit convey tube, holding mechanism and separated mechanism (vibrated chain-belt) of the designed seed-extraction machine is given also in the paper as a case study.