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12 gauge 20 incl AKRON Alcoa Alloy and temper ALUMINUM COMPANY aluminum sheet annealed Bank Bldg blank thickness blankholder breakdown operations carbon steel Cast-iron circular blank coining and embossing coining and stamping commercially pure aluminum Company of America creases cylindrical dead-soft deformation distortion Double-action toggle DRAWN SHAPES drawn shells ductile Figure 19 Final Draw Operation finish flat forming operations forming tool fracture gauge hard harder tempers hardwood heat treatment heat-treatable alloys hickory stick high-grade alloy holes inches INDEX TO FORMABILITY intermediate knockout Lathe speed mechanical properties metal spring-back metal thickness metalworking Mineral oils minum ness of blank nonheat-treatable alloy off-center chuck permanent set Piercing and perforating pressure punch dimension quenched radius readily reduction per draw require scrap Second draw shown in Figure single-action presses smaller radii spinning lathe spring stripper stamping tools surface Table VII tailstock tallow tensile strength thickness to punch tool steel usually wrinkles yield strength