Tube, Pipe & Profile Forming worked example

Bend Allowance with developed flat length available of 310 units: a worked example

What does the result look like when developed flat length available reaches 310 units? The full calculation is worked below with real intermediate numbers. Use it when bend allowance in tube, pipe and profile forming needs a clean margin number for a tube, pipe and profile forming go / no-go review.

The inputs for this scenario

  • Developed flat length available: 310 units (raised for this scenario; the documented default is 125)
  • Finished bent length required: 100 units (unchanged)
  • Nominal part length reference: 100 units (unchanged)

Working through the calculation

  • Applying the documented formula (Bend Allowance margin = available value - required value) to the inputs above produces each figure below.
  • At this operating point the engine returns 210 % for margin, the number this scenario is built around.
  • At this operating point the engine returns 210 value for absolute margin.
  • At this operating point the engine returns 310 value for available amount.
  • At this operating point the engine returns 100 value for required amount.

How this compares with the baseline

  • Against the tool's baseline example, where developed flat length available sits at 125 units and the headline result is 25 %, this scenario comes in 740% above the baseline at 210 %.
  • A figure at this level is achievable when developed flat length available is genuinely sustained, not just peaked for a shift. It is a length-margin check, not a true bend-allowance geometry calculation; it does not compute neutral-axis position from radius, wall, and K-factor, so pair it with a proper bend-deduction model for tight-radius work.

Results at a glance

  • Margin: 210 % (headline result)
  • Absolute margin: 210 value
  • Available amount: 310 value
  • Required amount: 100 value

Run it with your numbers

  • Every input above is editable in the live Bend Allowance calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.