. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . of Metal.—In preparing sheets of tinfor roofing purposes and constructing various sheet metalarticles which require the sheets to be perfectly squareand exactly the same size, with the edges true andstraight, the sheets can be squared very rapidly andaccurately on the squaring shears, Figure 1. A plan andend elevation of the squaring shears are shown in Figure144, where a is the front gauge, 6 the
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . of Metal.—In preparing sheets of tinfor roofing purposes and constructing various sheet metalarticles which require the sheets to be perfectly squareand exactly the same size, with the edges true andstraight, the sheets can be squared very rapidly andaccurately on the squaring shears, Figure 1. A plan andend elevation of the squaring shears are shown in Figure144, where a is the front gauge, 6 the lower cutting knife,and c the side gauge. CHAPTER III FOLDING EDGES AND SEAMING One of the most important processes in sheet metalworking is that of seaming. Seams of various kinds areused, depending on the strain to be resisted and the equip-ment on hand for constructing them. The machine ingeneral use for bending the edges of sheet metal forseaming is known as the adjustable bar folder, as shownin Figure 15. The following edges and seams are exten-sively used in light sheet metal work: Single Edge.—This edge, as shown in Figure 145, isused in constructing seams and hemming the edges of. Figure 145.—Single Edges formed on Sheet Metal. sheet metal. In forming this edge in the folder, set thegauge to the required width, then insert the metal in themachine, holding it firmly against the gauge with the lefthand. Grasp the handle with the right hand and bringthe folding bar over until it rests on top of the handle of the machine is now brought to its formerposition and the metal removed from the machine, com-pleting the operation. 163 164 SHEET METAL WORKERS MANUAL Double Edge.—The double lock, shown in Figure 146,while used in certain work, is most commonly utilized tostrengthen sheet metal forms. When used for this pur-pose it is known as a double hemmed edge. This edge is
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