Equipment Explained | The Olive Oil SourcePieralsi double-hammer/double-grid mill setups allow a decrease in the bitterness sometimes found when using traditional hammermills. The mill rotates much.hummer mill olive,Olive oil production with the continuous method. - Sabor ArtesanoContinuous method is the more modern used to make olive oil. . Hammer mills used in the continuous method in the olive oil extraction process. 5.