Fig. 44 shows a universal, reversible, structural mill. This mill has two horizontal rolls CC, and two vertical rolls DD. The mill shown in this view is for rolling large I-beams, and the vertical rolls make the top and bottom flange surfaces parallel. The vertical rolls are run by beveled-gear wheels under the casing K, connected to the engine by the shaft L. They may be readily adjusted so that the distance between them is increased or decreased. The universal type of mill does its work more rapidly than is the case with other types of large mills. It is also much used in rolling plates to avoid the necessity of trimming the plate edges after rolling.

Fig. 44. - Universal, Reversible, Structural Mill.