Heat and cut off about 5⁄8 inch of one corner, as at a, [Fig. 83], and form a depression with the top fuller 11⁄2 inches from the end on the side indicated at b, 1⁄4 inch deep at the upper edge, leaving the metal full thickness at the lower edge. Then the metal should be roughly spread out from the upper edge of the stock by holding the fuller lengthwise, as shown at C, leaving the lower edge the full thickness, and smoothed with a flatter, drawing the upper edge to 1⁄8 inch in thickness. The above operations could be done with a hand hammer, but not without considerable hard work.
Fig. 85.—Offsetting the Side Tool for Clearance.
Trim this end to the form shown in [Fig. 84], by using a sharp, hot cutter and cutting entirely from the side indicated by d. When this has been done correctly remove all metal extending more than 1⁄4 inch above the upper edge of the stock. When this has been forged to the correct shape, heat and place the tool so that the fullered shoulder is just beyond the edge of the anvil, then form the offset with a round-edged set hammer, as shown in [Fig. 85]. Grind the upper edge parallel with the stock but at a slight angle, to produce a cutting edge, and grind the face side straight and smooth. In cooling this tool for hardening it should be placed in the water, as shown in [Fig. 86], to insure hardening the whole cutting edge. Leave sufficient heat in the heel or bottom of the tool to draw the temper uniformly to a pale yellow.
Fig. 86.—Hardening the Side Tool.
101. Forging Tools.—The following forging tools are somewhat smaller than those used in general smith work, but they are perfectly serviceable and sufficiently heavy for manual training or considerable ordinary work. The material for their construction should be tool steel of 0.80 to 0.90 per cent carbon, 11⁄4 inches square, unless otherwise specified. The holes or eyes should be punched straight, and the precautions formerly given under the head of punches should be observed.
A tapered drift pin of an oval section 7⁄8 × 5⁄8 inch at the largest end, also a smaller oval-shaped handle punch, should first be provided.
102. Cold Chisel.—[Fig. 87]. Forging, hardening, and tempering tool steel. Material: 61⁄2 inches of 3⁄4-inch octagonal tool steel.
