Wire Drawing & Rod Processing worked example

Area Reduction Per Pass at 61% die transfer efficiency: a worked example

This worked example runs the area reduction per pass numbers for a tougher week than the baseline: 61% die transfer efficiency instead of the typical 85%. Area reduction per pass is the fraction of cross-sectional area a wire loses as it is pulled through a single die, and it is the single most important number a wire drawer schedules around.

The inputs for this scenario

  • Target finished cross-section area: 500 units (held at the documented default)
  • Reduction ratio per die pass: 0.08 units (held at the documented default)
  • Die transfer (drawing) efficiency: 61 % (the input this scenario stresses; the baseline uses 85)

Working through the calculation

  • The calculation starts from the formula this tool documents: Required area reduction per pass = covered amount × use per unit ÷ transfer efficiency.
  • Required quantity works out to 65.57 sq ft at these inputs, and this is the headline figure for the scenario.
  • Theoretical amount works out to 40 sq ft at these inputs.
  • Loss allowance works out to 25.57 sq ft at these inputs.
  • Efficiency works out to 61 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where die transfer efficiency sits at 85% and the headline result is 47.06 sq ft, this scenario comes in 39.34% above the baseline at 65.57 sq ft.
  • Use it when laying out a multi-die pass schedule, re-sizing a die box after a wire size change, or checking whether a single die is being asked to carry too much reduction. 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

  • Required quantity: 65.57 sq ft (headline result)
  • Theoretical amount: 40 sq ft
  • Loss allowance: 25.57 sq ft
  • Efficiency: 61 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Area Reduction Per Pass calculator, set die transfer efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.