الفهرس 
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Abstract
Harvest and post-harvest machinery is one of the most equipment handling with seeds and grains. Therefore, it is necessary to provide databases within physical properties and engineering parameters of seeds and grains. So that this study aims to determine of physical properties and engineering parameters for some seeds (Cumin, Sesame, Anise and Clover) aiming to construct a local manufactured simple machine for cleaning some seeds. Within moisture content (MC) levels of 12-16% (w.b) for (cumin, sesame and anise) and 10-14% (w.b) for clover seeds, the obtained results revealed that physical properties in terms of length, width, thickness, mass of thousand seeds, volume of seed, arithmetic diameter, geometric diameter, flat surface area and transverse area increased by increasing of mentioned MC levels for the all studied seeds, in contrast, the bulk density decreased. Also, percent of sphericity decreased for sesame seeds but increased for clover seeds by increasing of mentioned MC levels. While, for Cumin and Anise seeds it was increased with increasing of moisture content of seeds from 12-14% (w.b.) and decreased with increasing of moisture content of seeds to 16% (w.b.). On the other hand, engineering parameters in terms of angle of repose, critical velocity and coefficient of friction for (seeds, wood surface, galvanized sheet, plastic surface) increased by increasing of mentioned MC levels for the studied seeds. Critical velocity values at (12, 14 and 16%) MC levels, were (5.45, 5.78 and 5.9 m/s) for sesame, (3.53, 3.93 and 4.15m/s) for cumin, (3.6, 3.75 and 3.93) for anise, , respectively, and (8.4, 8.75 and 8.95 m/s) for clover at (10, 12 and 14%), respectively. Physical properties and engineering parameters of sesame and clover seeds affecting on seeds cleaning. Screen title angles, hole diameters and sieve oscillation affected loading rate, machine efficiency and purity. The optimum performance was at sieve oscillation of 2.26 m/s)160 rpm), screen tilt angle of 3 degrees and round shaped screen 3 mm at 12% moisture content loading rates were 50 and 50.94 kg/h , machine efficiency were 95.07 and 95.2% and purity were 99.78 and 99.78% for sesame and clover seeds, respectively.