Abstract: A centrifuge for the dewatering of a fine grained material having a downwardly flaring frusto conically shaped porous sieve cage rotatable about its axis and axially oscillatible with a preacceleration frusto conically shaped cone within the sieve cage with its larger end upwardly and a central material delivery means for supplying material to the cone and an annular spoked mounting means extending between the base of the cone and sieve cage with a drive connecting to the mounting means and an elastic connection between the rotatable drive and sieve cage and an elastic connection between the oscillatible drive and sieve cage and an annular downwardly extending solid collection housing mounted at the lower end of the sieve cage and an annular housing surrounding the sieve cage for the collection of water with the oscillatible drive and rotatable drive mounted at the base of the unit coaxial with each other.