# Sheet-metal bend allowance
# Scope: Neutral-axis bend allowance from supplied K factor; angle is bend rotation.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

angle = 90 deg
insideRadius = 2 mm
thickness = 1 mm
kFactor = 0.4

allowance := angle*(insideRadius+kFactor*thickness) [mm]

check allowance budget: allowance <= 5 mm

scenario alternative: angle = 72 deg