Abstract: A granulator or grinding mill comprising a pair of power driven drums mounted at the bottom of a housing. The first drum is provided on its periphery with a plurality of fingers or pins projecting through slots in an inclined plate hingedly secured to a side of the housing. The fingers or pins break various pieces of articles, such as unfired pottery and ceramic, dumped in the housing on top of the plate, the pieces falling to a lower level being those small enough to pass between consecutive fingers and a crushing plate mounted on the side of the housing. The pieces falling to a lower level are further broken and pulverized by a power driven cylinder provided on its surface with longitudinal bars. The bottom of the housing has an aperture masked by a removable screen of a predetermined mesh, such that only particles capable of passing through the screen and falling in a receptacle are reused, for example for making a slurry for manufacturing ceramic or pottery.