The First machine to remove impurities by size for pre-cleaning of intake having 3 nets to allow passage of powdery materials including dust and dirt (through 1.5 mm round perforation) in the first net , Other impurities of size to pass through 2.5 mm round perforation in the 2nd net , and the wheat including impurities of size ranging between 2.5 mm to 10mm to pass through the 3rd net of 10mm round perforation. Finally as tailing the other impurities like chaffs, straws etc of sizes over 10 mm to collect separately.
