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Abstract
Grain grading is the process key of determining the grain`s marketibility .Grain cleaning is abasic procedure in the grain grading system in which impurities or contaminants are seperated from sound grains .Clean grain reduces problems that occur during storage and headling .Clean grain also save storage space and increases marketibility .Over the last few years grain production per feddan was improved significantaly as aresult of using better seeds and and new techniques of mechanaziation.The objective of the present work was to study and evaluate the performance of agravity seperator in order to realize the following :
a)-Complete seperation.
b)-Minimum seed loss.
c)-Increase seperator efficiency.