a method of producing a foundation bed for a granulator mill includes the steps that the foundation bed is cast from a plastic - or concrete based casting material in a mold manufactured from thin sheet metal , the mold being given surfaces for cooperation with a granulator mill housing with high precision . in order to avoid after - treatment of the surfaces of the mold intended for cooperation with the granulator mill housing , these surfaces are clamped during the casting process against a common , configurationally stable clamping member .