Metals, Steel, Aluminum & Coil Processing worked example

Coil Changeover Loss at 17% threading and setup allowance: a worked example

What does the result look like when threading and setup allowance reaches 17%? The full calculation is worked below with real intermediate numbers. Use it when a line supervisor is scheduling a multi-coil run and needs an honest changeover time before committing the shift plan.

The inputs for this scenario

  • Coil changeovers in the run: 24 changeovers (unchanged)
  • Changeovers completed per hour: 6 changeovers / hr (unchanged)
  • Threading and setup allowance: 17 % (raised for this scenario; the documented default is 15)

Working through the calculation

  • Applying the documented formula (Base changeover time = coil changeovers in the run รท changeovers completed per hour) to the inputs above produces each figure below.
  • At this operating point the engine returns 4.68 hr for total changeover time, the number this scenario is built around.
  • At this operating point the engine returns 4 hr for base changeover time.
  • At this operating point the engine returns 17 % for threading and setup allowance.
  • At this operating point the engine returns 6 pieces / min for changeovers completed per hour.

How this compares with the baseline

  • Against the tool's baseline example, where threading and setup allowance sits at 15% and the headline result is 4.6 hr, this scenario comes in 1.74% above the baseline at 4.68 hr.
  • A figure at this level is achievable when threading and setup allowance is genuinely sustained, not just peaked for a shift. It assumes a steady average changeover rate; in practice a jammed thread, a camber-related tracking issue, or a heavy coil can blow well past the allowance, so treat the result as a planning estimate, not a guarantee.

Results at a glance

  • Total changeover time: 4.68 hr (headline result)
  • Base changeover time: 4 hr
  • Threading and setup allowance: 17 %
  • Changeovers completed per hour: 6 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.