Abstract: A grinding apparatus includes a receptacle, a grinding element and a drive means. The receptacle has a receptacle inner wall defining a receptacle cavity. The receptacle inner wall is in the general form of a surface of a revolution extending about a central vertically extending receptacle axis. The receptacle is rotatable about the receptacle axis. The grinding element has a grinding element outer wall in the general form of a surface of revolution extending about a central vertically extending grinding element axis.
Abstract: A grinding apparatus comprises a receptacle, a grinding element and a drive means. The receptacle has a receptacle inner wall defining a receptacle cavity. The receptacle inner wall is in the general form of a surface of a revolution extending about a central vertically extending receptacle axis. The receptacle is rotatable about the receptacle axis. The grinding element has a grinding element outer wall in the general form of a surface of revolution extending about a central vertically extending grinding element axis.