Sheet Metal Master vs Bend Allowance Calculator

Sheet Metal Master is an on-device calculation tool for duct fabrication, pipe fitting, and sheet-metal layout. Enter measurable dimensions to preview patterns, define fabrication allowances, save projects, and export DXF files. 15 TASKS • Ductwork: round-to-rectangle, rectangular reducer, 90° round tee, rectangular offset, rectangular miter elbow, and rectangular tee • Pipe and vessel work: oblique round tee, equal-diameter round Y branch, segmented elbow, cone/frustum, oblique-cut pipe, and spherical-head gores • Bending: single bend, double bend, and box bend WORKFLOW • Live result and flat-pattern previews • Welding, riveting, lock-seam, and manual allowances • Save, reopen, and update local projects • Share calculation summaries • Export millimeter-based ASCII R12 DXF files Core calculations run locally on your device. The round Y branch is a field-fit construction. A sphere cannot be flattened without strain, so spherical-head gores are an approximation with a reported boundary-strain value. Always verify material, connection details, and a sample before production cutting. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Setting up a press brake job and need the bend allowance, deduction, or flat blank length before you cut? Getting it wrong wastes material and time. This calculator computes BA, OSSB, BD, and flat blank from your K-factor, material thickness, bend radius, and angle. Enter material thickness, inside bend radius, bend angle, and K-factor (or use presets for mild steel, aluminum, stainless). Get bend allowance, bend deduction, outside setback, and total flat blank length. WHAT IT CALCULATES: - Bend Allowance (BA) - Bend Deduction (BD) - Outside Setback (OSSB) - Flat blank length for single and multi-bend parts - Arc length of the neutral axis K-FACTOR PRESETS: - Air bend, bottom bend, coining - Mild steel, aluminum, stainless steel - Custom K-factor entry KEY FEATURES: - Multi-bend flat pattern layout - Standard K-factor presets - Metric and imperial units - Works completely offline - No account or login required Built for sheet metal fabricators, press brake operators, and mechanical engineers.