Abstract: A pulverizing machine in which alongside the pulverizer rotor 16 are a classifier zone 29 and a conveyor zone 41. The rotor 16 has pulverizer members 25 which project into an annular reducing zone 27. Guide means 17 is provided in the conveyor zone to provide spiral paths to convey a rotating flow of air and reduced material spirally inwards from one end part 45 of the reducing zone to the classifier zone 29, and the latter is positioned to allow oversize material particles to pass outwards from the classifier zone directly to said end part of the reducing zone while the undersize particles are carried inwards, optionally via a rotary classifier 18, to an outlet 15.