Tube, Pipe & Profile Forming worked example
Bend Allowance with developed flat length available of 63 units: a worked example
This worked example runs the bend allowance numbers for a tougher week than the baseline: developed flat length available of 63 units instead of the typical 125 units. Bend Allowance in tube and profile forming is the extra stock you carry to cover the neutral-axis stretch and the trim you lose in a bend.
The inputs for this scenario
- Developed flat length available: 63 units (the input this scenario stresses; the baseline uses 125)
- Finished bent length required: 100 units (held at the documented default)
- Nominal part length reference: 100 units (held at the documented default)
Working through the calculation
- The calculation starts from the formula this tool documents: Bend Allowance margin = available value - required value.
- Margin works out to -37 % at these inputs, and this is the headline figure for the scenario.
- Absolute margin works out to -37 value at these inputs.
- Available amount works out to 63 value at these inputs.
- Required amount works out to 100 value at these inputs.
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 248% below the baseline at -37 %.
- Use it during blank-size sign-off or when quoting stock, before you commit a cut length to the bender. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.
Results at a glance
- Margin: -37 % (headline result)
- Absolute margin: -37 value
- Available amount: 63 value
- Required amount: 100 value
Run it with your numbers
- To rerun this with your own numbers, open the live Bend Allowance calculator, set developed flat length available to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.