The long bar should now be cut off 41⁄2 inches from the inside of the bend, and a fan-shaped scarf formed with the ball of the hammer, as at e. This should be drawn thin on the end and sides. The center of the 41⁄2-inch length is next bent and the last scarf placed in position at f by again inserting the mandrel, placing it in the swage, and closing down the edges around the portions at f. It is then ready for welding. Figure [62] shows this in solid lines.
Fig. 65.—Making an Eye for a Swivel.
A good clean heat should be procured for welding; the mandrel should be quickly inserted, placed in the swage, and the welding done. This being completed, a small eye is to be made of 3⁄8-inch round iron: first, by bending it in the form shown at a, [Fig. 65]; second, by inserting a punch in the opening and hammering the ends together, forming the eye, as shown at b; third, by welding these ends solidly together, as at c, and forging the whole to fit loosely in the swivel. The fitted end is now cut off square 3⁄8 inch longer than the depth of the hole in the swivel, heated, and, while the eye is held in the vise, it is quickly riveted into place with a small straight or ball peen hammer. The eye is shown in place by the broken lines in [Fig. 62]. Connect this swivel to the chain with one of the extra links.
83. Chain Swivel.—Figs. [66] and [67]. Fullering, forging, bending, welding, and riveting. Material: a piece of 1 × 1⁄2-inch iron, 4 or more inches long.
Using top and bottom fullers, form two sets of depressions not deeper than 1⁄4 inch, on each edge and opposite to each other, the first pair to be 1 inch from the end, the second pair 1 inch from the first, as at a.
Fig. 66.—Steps in Making a Swivel.
Draw the 1-inch end to 7⁄16 inch round, leaving it slightly heavier where it was fullered to provide excess metal for further bending. The opposite end should now be cut off 1 inch from the fullered place and drawn to the same dimensions as the first end. Forge the central portion into a circular form and punch a 3⁄8-inch hole in its center. Cut off all surplus material, making the ends 31⁄2 inches long from the center of the hole, as at b.