Abstract: A mill for reducing solid material into smaller pieces including a hammer member oriented for rotation and having a plurality of hammer pins coupled to the hammer member for fragmenting solid material. A cutting member is oriented for rotation and having a plurality of blades for cutting solid material. The hammer member is positioned proximate to the cutting member so that solid material processed through the mill is broken into smaller pieces. The hammer member has a plurality of blades that are positioned, one each between adjacent hammer pins. The hammer member has a longitudinal axis about which the hammer member rotates. The cutting member has a longitudinal axis about which the cutting member rotates. The hammer member and the cutting member each having substantially cylindrical peripheries; and each of the peripheries includes a plurality of circumferentially aligned ridges and recesses.