Fig. 2962.
A top and bottom die and block are made to contain the work, as in [Fig. 2961], a and b being the work ends. Through these dies are two holes for two punches which are driven through together as marked; the dies are held fair, one with the other, by four holes in the lower and four pins in the upper one, a section and top view of the dies being shown in [Fig. 2962].
Fig. 2963.
The piece is at this stage roughed out to shape all over, and may be finished between the pair of finishing dies shown in [Fig. 2963], which also represents a plan and sectional view, a, b, c, d being the holes to receive guide pins in the upper die.
An excellent example of forgings in Siemens Martin steel is given in the following figures, being the rope sockets for the Brooklyn Bridge.
Fig. 2964.