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BendMath Publishes Printable Bend Worksheet With Worked K-Factor and Bend-Allowance Examples
TelAve News/10911853
PORTLAND, Ore. - TelAve -- PORTLAND, Ore. — November 5, 2026 — BendMath has published a printable bend worksheet that turns its free K-factor and bend-allowance calculators into a shop reference, with worked examples and blank rows for recording each job's material, thickness, radius, angle and result.
The worksheet states the bend-allowance formula, BA = (π / 180) × A × (r + K × t), where A is the bend angle in degrees, r is the inside radius, K is the K-factor and t is the material thickness. Its worked example uses 16-gauge mild steel with a K-factor of 0.42, thickness 0.0598 inches and inside radius 0.0598 inches: a 90-degree bend gives a bend allowance of 0.1334 inches and a neutral-axis radius of 0.0849 inches, with the neutral axis 0.0251 inches from the inside face; a 45-degree bend with the same setup gives 0.0667 inches.
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The worksheet also sets out a test-coupon procedure: bend a sample, measure it, back-calculate the K-factor from the measured bend, and re-check before production. The K-factor calculator was tested with changed inputs and the bend-allowance example was recomputed from the formula; both returned consistent results. The worksheet warns that calculated values are estimates to validate against the actual material, tooling and supplier data before production.
Print the worksheet and open the K-factor calculator:
https://bendmath.com/reference/bend-worksheet/
https://bendmath.com/sheet-metal/k-factor-calculator/
About BendMath: BendMath publishes free sheet-metal and press-brake calculators and reference material for fabricators.
The worksheet states the bend-allowance formula, BA = (π / 180) × A × (r + K × t), where A is the bend angle in degrees, r is the inside radius, K is the K-factor and t is the material thickness. Its worked example uses 16-gauge mild steel with a K-factor of 0.42, thickness 0.0598 inches and inside radius 0.0598 inches: a 90-degree bend gives a bend allowance of 0.1334 inches and a neutral-axis radius of 0.0849 inches, with the neutral axis 0.0251 inches from the inside face; a 45-degree bend with the same setup gives 0.0667 inches.
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The worksheet also sets out a test-coupon procedure: bend a sample, measure it, back-calculate the K-factor from the measured bend, and re-check before production. The K-factor calculator was tested with changed inputs and the bend-allowance example was recomputed from the formula; both returned consistent results. The worksheet warns that calculated values are estimates to validate against the actual material, tooling and supplier data before production.
Print the worksheet and open the K-factor calculator:
https://bendmath.com/reference/bend-worksheet/
https://bendmath.com/sheet-metal/k-factor-calculator/
About BendMath: BendMath publishes free sheet-metal and press-brake calculators and reference material for fabricators.
Source: BendMath
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