The Calibrafruta mechanical sorting lines to work chestnut, lupine and other dry fruits are built to remove, at first, non-fruit objects remaining at the unloaded fruit bins. However, its main function is to optimize the separation of the different sizes with its cylindrical barrel and the successive and diametrically different holes in the cylindrical mesh. The production capacity of this machine varies according to the barrel's diameter and the adjustable speed of the working line.