Many patterns are of such an irregular shape that a straight parting line cannot be obtained while molding. In cases of this kind, the pattern is usually mounted on a molding board (sometimes called a follow board). This board is so contrived as to support the pattern upside down in the desired position in the mold. The drag is reversed and rammed while the pattern is supported upon the molding board. Then the drag is turned over, the board removed, and the cope rammed as usual.
The molding board is used also to support small patterns which tend to spring from the force of the ramming. All stove-plate work that is not mounted on machines is molded in this way, the method, of course, making necessary a special equipment of flasks.