Wire Drawing & Rod Processing worked example

Changeover Time at 12% contingency allowance: a worked example in wire drawing & rod processing

This scenario runs the changeover time calculation on the strong side: 12% contingency allowance, with every other input held at its documented default. Use it when changeover time in wire drawing and rod processing needs a defensible run time before a quote goes out.

The inputs for this scenario

  • Setup work required: 120 units (unchanged)
  • Changeover work rate: 12 units / hr (unchanged)
  • Contingency allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base changeover time time = required work รท processing rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for adjusted run time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base run time.
  • At this operating point the engine returns 12 % for allowance applied.
  • At this operating point the engine returns 12 pieces / min for process rate.

How this compares with the baseline

  • Against the tool's baseline example, where contingency allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • Use it when planning production sequences, evaluating SMED improvements, or deciding whether a short run justifies its changeover. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Adjusted run time: 11.2 hr (headline result)
  • Base run time: 10 hr
  • Allowance applied: 12 %
  • Process rate: 12 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.