Sheet Metal Calculators
Flatten and size sheet-metal work: bend allowance and bend deduction from angle, inside radius, thickness and K-factor, cone/frustum flat-pattern radii and sector angle, flat-blank length, and air-bending tonnage from thickness, bend length and V-die opening.
Bend Allowance
Bend allowance, deduction and setback from angle, radius, thickness and K-factor.
Bend Deduction
Flat (blank) length and bend deduction for a press-brake bend.
Cone Flat Pattern
Conical frustum flat pattern radii, sector angle, slant height, arc lengths and blank area from diameters and height.
Press Brake Tonnage
Air-bending press force from thickness, bend length, V-die opening and material strength.
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These tools turn a folded press-brake part back into an accurate flat blank and check whether the brake has enough force. The sheet-metal bend allowance calculator computes the neutral-axis arc consumed by a bend, BA = (π/180)·A·(R + K·t), along with outside setback OSSB = (R + t)·tan(A/2) and bend deduction BD = 2·OSSB − BA, from the bend angle A, inside radius R, thickness t and the K-factor that locates the neutral axis. The press-brake bend deduction calculator then gives the flat (blank) length as the sum of the outside flanges minus one deduction per bend.
For cone and duct-style developments, the sheet metal cone flat pattern calculator develops a cone or conical frustum into outer radius, inner radius, sector angle, slant height, arc lengths and blank area with seam allowance. For machine capacity, the press brake tonnage calculator estimates air-bending force from thickness, bend length, V-die opening and tensile strength with F = 1.6·UTS·L·t²/V. That makes die opening, material strength and geometry visible instead of burying them in a chart.
They are for sheet-metal designers, fabricators and CNC programmers who need the blank, pattern and tonnage to make sense before cutting a batch. See the guide on what the K-factor is, the difference between bend allowance and bend deduction, and the sheet-metal gauge chart to pull a thickness by material.