Fig. 2383.
If the rod be large, the ends may be, and usually are, forged and fitted up separately, and subsequently welded to the body of the rod, which has been forged separately. In this case, the alignment of the parts is a part of the process in welding the rod, and setting it after welding. All the principles involved in making the rod ends separate, and afterwards welding them, or in marking out a small and complete forged rod, are, however, involved in the process of refitting an old rod in the jaws, and putting in new brasses; hence a description of that process will cover the whole ground. The first thing to do is to file up the side faces, as f, g, [Fig. 2381], and, in doing this, all that is necessary is to file f up true, when tested by a straight-edge applied as in [Fig. 2383], in which r is the fork and s a straight-edge, whose edge should measure the same distance at h as it does at i from the side face f, while the face c measures the same distance from face a of the other fork end, or from the imaginary centre line x, [Fig. 2381]. Then turning the rod on its side, a straight-edge should be placed across the face f, and one across the face g, as in [Fig. 2384], at s and s′; and the edges of the two straight-edges should stand parallel, when sighted in such a position that the edges are very nearly in line with the eye, as shown in the figure.
Fig. 2384.
The inside faces of the fork jaws may be filed to measurement from the outside ones.
