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Metals used in sheetmetal work
How to measure the thickness of sheet metal
How to measure
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aluminum angle ball-peen hammer bar folder beading bench bending metal blade block blow torch burr burring chisel circumference rule clamp cold chisel combination square correct Courtesy Niagara Machine crimping cutter cutting metal disc distance double seam dovetail seam draw exercise provides practice fastened flange flat flatten flux folding front rolls furnace galvanized iron grooved seam hand snips handle head holes in sheet hollow punch intersection of cylinders lap seam laying layout length Lower the upper Machine and Tool mallet micrometer notch operation pattern Place procedure protractor punching holes rectangular rivet roll forming machine sal ammoniac scribe shape sheet metal sheet-metal shown in Fig side single seam slightly slip roll forming soldering copper squaring shears stake steel steel square straight straightedge stretchout STUDY QUESTIONS surface tapered thickness tin plate tool bit trammel points turning machine types Unit upper roll vernier scale width wired edge zinc chloride