Relief Notch Size Calculator
Corner relief prevents side flanges from tearing, overlapping or binding at sheet-metal box corners. The box flat-pattern calculator screens a simple relief size.
relief notch size calculator sheet metal corner relief calculator sheet metal box blank
Simple relief screen
minimum relief = inside radius + thickness
Where it fits
Use relief with flat blank size, bend-line offset, bend allowance and bend deduction when laying out an open box or tray.
Production caution
Real parts may need round reliefs, slots, tabs, weld gaps, hems or shop-specific corner details.
Related pages
- Bend allowance calculator - neutral-axis arc length and flat-pattern inputs.
- Bend deduction calculator - flat length from outside mold-line dimensions.
- Box flat pattern calculator - tray blank size, bend lines and relief screen.
- Press brake tonnage calculator - forming force and V-die checks.