Grinder used in meat grinding

A grinder having a worm conveyor (9) and a set of blades consisting of a carving blade (3) arranged after the worm conveyor (9), an additional carving blade (4), having an axial extension, arranged after carving blade (3), a perforated disc (7) arranged at a fixed distance after carving blade (3), and a driven blade (6), having an axial extension, arranged between carving blade (4) and perforated disc (7), the set of blades being clamped with a cap nut (10) in the worm housing, characterized in that the distance between carving blade (3) and perforated disc (7) is greater than or equal to the axial extension of blade (6) and second carving blade (4), that blade (6) on drive shaft (11) and carving blade (4) in the housing rest on bearings in an axially displaceable fashion, that blade (6) is pressed against perforated disc (7) by a first pressure element (1), and that carving blade (4) is pressed against blade (6) by a second pressure element (2).