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Figure 4: Bending sheet metal
Airman Knowledge Testing Supplement for Aviation Maintenance Technician – General, Airframe, and Powerplant; and Parachute RiggerOfficial PDF AMA
Practice
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3" Flat B 4" Flat A 0.0625 3/16" R. Setback = R+T Bend allowance = 2π (R + ½T) 4