Fig. 67.—The Completed Swivel.
Bend each end to a right angle close up to the eye and make the arms parallel and one inch apart, as at c. Drift the hole by driving the punch through between the parallel ends, thereby forming a slightly tapered hole. Scarf and weld the ends as you would a link. Make a small eye of 3⁄8-inch round stock, proceeding in the manner explained in the previous exercise, also following the same instructions as to fitting, cutting, and riveting. Connect the link end of this swivel to the chain with one of the extra links. (See [Fig. 67].)
Fig. 68.—Steps in Making a Chain Grabhook.
84. Chain Grabhook.—[Fig. 68]. Forging, punching, and bending. Material: one piece of 3⁄4 × 3⁄8-inch iron, 41⁄2 inches long.
Form a depression as at a, 1⁄4 inch deep and 3⁄4 inch from one end with overhanging blows. (The opposite edge should be kept perfectly straight during this and the following operations.) Forge the 3⁄4-inch end into a circular-shaped eye 3⁄8 inch thick, and punch a 1⁄4-inch hole, in the center, as at b. This hole should be drifted or expanded with a punch driven through from both sides alternately until the diameter becomes 1⁄2 inch.
By hanging this eye over the horn of the anvil so that the inner corners of the eye rest on the horn, by delivering blows opposite to those corners, and by changing its location so that blows will be delivered on all outside corners, the sectional form will be changed from square to octagon; by similar operations the form may be changed from octagon to round. During this change, light blows should be used in order to make the eye smooth. This stage is shown at c with a sectional view of the eye.
Fig. 69.—The Completed Chain Grabhook.