CNC Machining worked example

Setup Time Per Part with total setup time of 450 min: a worked example

Push total setup time up to 450 min and the picture changes. This example computes every intermediate figure at that operating point. allocating setup time to parts for quoting, scheduling, SMED projects, or lot-size decisions

The inputs for this scenario

  • total setup time: 450 min (raised for this scenario; the documented default is 180)
  • batch quantity: 250 parts (unchanged)
  • setup efficiency factor: 1 x (unchanged)

Working through the calculation

  • Applying the documented formula (Setup Time Per Part = total setup time ÷ batch quantity × setup efficiency factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 1.8 min / part for base setup time per part, the number this scenario is built around.
  • At this operating point the engine returns 1.8 value for raw ratio.
  • At this operating point the engine returns 1 x for conversion factor.
  • At this operating point the engine returns 250 value for batch quantity.

How this compares with the baseline

  • Against the tool's baseline example, where total setup time sits at 180 min and the headline result is 0.72 min / part, this scenario comes in 150% above the baseline at 1.8 min / part.
  • It divides total setup time by batch quantity, scaled by an efficiency factor, to give the setup minutes amortized onto each part. 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

  • base setup time per part: 1.8 min / part (headline result)
  • Raw ratio: 1.8 value
  • Conversion factor: 1 x
  • batch quantity: 250 value

Run it with your numbers

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

Last reviewed 2026-05-12.