BendBook - bending calculator

BendBook is an engineering calculator for sheet-metal work: bend allowance, DXF export, sheet and bar stock nesting, and a project library - all fully offline, with no internet connection, ads, or data collection required. WHAT IT DOES: Bend Allowance & Springback • Calculate bend allowance and bend deduction using any K-factor or bend-allowance method • Predict bend radius and tonnage from material thickness, type, and V-die opening • Measure K-factor - enter results from your own test bends and get a real K-factor for your material and press, instead of relying on a generic table Drawings & Export: • Build a flat-pattern layout with cutouts and features • Export to DXF, PDF, or PNG with dimensions in place - ready for CNC and the shop floor • 3D fold preview along bend lines before you commit Material Nesting: • Optimize sheet and bar stock layout against available blanks • Per-part cycle time and cost estimate (Quote panel) Shop Organization • Project, part, and tooling (punch/die) library that persists between sessions • Built-in calculator (arithmetic, fractions, arcs, unit conversion) and a part-weight calculator, both opening as floating windows without leaving your current screen • PIN lock and a trash bin with undo Built for engineers, programmers, and fabricators who calculate bends every day and need an exact answer immediately, without an internet connection or extra steps.