Sheet Metal Product- Development Process.

A: 1.7 kg is the sanity check value. Area 0.18 m² times thickness 0.0012 m gives volume 2.16e-4 m³. Multiply by 7850 kg/m³ and you're at ~1.7 kg. The trap is skipping thickness or pre-loading scrap before you even have nesting.

A: 0.2–0.5 mm is where e-coat and weld distortion live, so sequence matters. The drawing controls the delivered state. Material thickness is a prerequisite check, but flatness must be verified on the coated assembly using the defined datums, not an earlier manufacturing state.

A: 2.4 mm is the gatekeeper number. θ is π/2 radians. R is 1.5 mm and K·T is 0.5 mm, so effective radius ~2.0 mm. Multiply by 1.57 and you land near 2.4 mm. Most errors come from degrees or neutral axis assumptions from stamping.

A: 0.3–0.5 mm/year local loss is the danger zone here. Chipped paint plus salt spray sets up crevices and underfilm attack. Uniform corrosion assumes immersion, and oxidation needs heat you don't have underfloor.