CNC Machining worked example

Setup Time Per Part with total setup time of 90 min: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop total setup time to 90 min, then walk the calculation through step by step. Allocate CNC setup time across a production quantity to show the setup-time burden carried by each part.

The inputs for this scenario

  • total setup time: 90 min (the input this scenario stresses; the baseline uses 180)
  • batch quantity: 250 parts (held at the documented default)
  • setup efficiency factor: 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Setup Time Per Part = total setup time ÷ batch quantity × setup efficiency factor.
  • base setup time per part works out to 0.36 min / part at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 0.36 value at these inputs.
  • Conversion factor works out to 1 x at these inputs.
  • batch quantity works out to 250 value at these inputs.

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 50% below the baseline at 0.36 min / part.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to total setup time, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It only covers setup time — it says nothing about cycle time per part, so a low setup-per-part figure can still sit on a slow-cutting job.

Results at a glance

  • base setup time per part: 0.36 min / part (headline result)
  • Raw ratio: 0.36 value
  • Conversion factor: 1 x
  • batch quantity: 250 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Setup Time Per Part calculator, set total setup time to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.