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PULLS AND HINGES 167 stock, having the eyes that form the joint welded. After the size of the hinge and the strength is determined, the eye for the joint is turned and welded. To do this the stock is heated on one end and hammered on the flat part until it is drawn sharp. The eye may then be formed and welded, cutting out the stock between the projections with a saw and chisel. The projections will then fit into the projections on the other half of the hinge, allowing a pin or rivet to pass through the eyes so that the hinge will swing. The width of the projections on one leaf should equal the width of the projections on the other. The length of stock necessary to form the eye of the hinge is three times the diameter. Another method of forming the eye is to hammer the end of the bar sharp. The quantity of stock for the eye is then found, and the bar heated and split through from one side with a thin hot chisel. The length of the splits is the same as that required for the eye. See B, where a bar is shown split and ready for the eye to be formed. Note that the splits are not run to the end. The reason for this is that after the eye is turned this part is to be welded to the bar. (See C.) After it is welded and the eye hammered into shape the center part between the splits is cut out with a long, slim hot chisel, leaving two pi'ojections on the leaf. The other leaf of the hinge is formed and welded in the same |
Hand Forging by Thomas F. Googerty