An apparatus (10) comprising a pair of associated chopper drums (20), including a top chopper drum (21) and a lower chopper drum (22). The chopper drum (20) defines an axial cylindrical bore (25) having a rotational axis (26) into which is mounted a drive shaft (not shown) that is keyed radially to drive the chopper drum (20). Radially spaced from the rotational axis (26) are a plurality of outwardly facing recesses (30) defined by walls of a body of the chopper drum (20). Each recess (30) extends longitudinally along the periphery of the chopper drum end-end to provide a recess for mounting a corresponding plurality of cutting blades (35). Each recess is defined by a longitudinally extending lower wall (31) and an opposed and circumferentially spaced. The cross sectional profile of the chopper drum (20) is generally consistent throughout its length and includes a plurality of ridges (26) and troughs (27) with the ridges (26) built up to define therein the recesses 30, the ridges (24) being interposed by the troughs (27). A higher side wall (32) provides support for the cutting blade (35) and is inclined relative to a plane (36) extending radially outwardly from the rotational axis (26). The opposed smaller side wall (31) supports a wedge clamp (40).Un aparato (10) que comprende un par de tambores cortadores asociados (20), incluyendo un tambor cortador superior (21) y un tambor cortador inferior 22 el tambor picador (20) define un orificio cilíndrico axial (25) que tiene un eje giratorio (26) dentro del cual se monta un eje de accionamiento (no se muestra) que está enchavetado radialmente para accionar el tambor picador (20) separada radialmente desde el eje giratorio (26) está una pluralidad de recesos que se orientan hacia afuera (30) definidos por paredes de un cuerpo del tambor picador (20) cada receso (30) se extiende longitudinalmente a lo largo de la periferia extremo a extremo del tambor picador para proveer un receso para montar una pluralidad correspondie
