GEOMETRY AND CAD / FIELD NOTE 13
Developed Blank vs Finished Face Area
A compound-curved face and its starting sheet blank describe different geometries. Returns, trimming allowance and forming behavior can change the blank size needed for the part.
What to check on your project
List finished face area, estimated blank size and purchased stock as separate measures. Ask the fabricator to develop blanks for the chosen forming route and flag critical panels where stock width or trim allowance limits the design.