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Aircraft alloy angle annealed ascends assembly attached automatic bending blank diameter blankholder blanking centers blanking punch block brass broaching broaching machines bushings cartridge cent clearance coil compression copper crank crankshaft cut-and-carry dial feed dimensions Douglas Aircraft Company drawing punch drawn drop hammer Duralumin edges ejected equipment finished piece finished shell flange forging formula front elevation gage height high-speed holes horizontal hydraulic press idle station inch inserted knockout layout length Lockheed Aircraft Corporation machine Masonite material thickness method mounted necessary notching operation perforating position press stroke press tools pressure produced progressive punch descends punch holder radius ram descends redrawing rolls rubber scrap strip screws sections shape shearing shedder shoe shown in Fig shows sides slide slot spot-welding spring pad square station steel stripper plate surface swaging tool steel trimming vertical welding width wrinkles zinc