Tube, Pipe & Profile Forming worked example

Ovality Tolerance Margin with actual roundness capability of the formed tube of 310 units: a worked example

Push actual roundness capability of the formed tube up to 310 units and the picture changes. This example computes every intermediate figure at that operating point. Use it when ovality tolerance margin 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

  • Actual roundness capability of the formed tube: 310 units (raised for this scenario; the documented default is 125)
  • Ovality limit called out on the print: 100 units (unchanged)
  • Nominal tube diameter used as the reference: 100 units (unchanged)

Working through the calculation

  • Applying the documented formula (Ovality Tolerance Margin 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 actual roundness capability of the formed tube sits at 125 units and the headline result is 25 %, this scenario comes in 740% above the baseline at 210 %.
  • It computes the gap between your available ovality capability and the required ovality limit, then expresses that gap as a percentage of the nominal reference so you can compare it across part sizes. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

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 Ovality Tolerance Margin calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.