CNC Machining worked example

Tool Change Time Cost with tool changes per production batch of 45 changes: a worked example

Push tool changes per production batch up to 45 changes and the picture changes. This example computes every intermediate figure at that operating point. estimating the financial impact of tool changes in a batch, shift, or quote

The inputs for this scenario

  • Tool changes per production batch: 45 changes (raised for this scenario; the documented default is 18)
  • Minutes lost per tool change: 4.5 min / change (unchanged)
  • Combined machine and labor burden rate: 110 $ / hr (unchanged)
  • Minutes-to-hours conversion factor: 0.02 hr / min (unchanged)

Working through the calculation

  • Applying the documented formula (Tool-change time cost = tool changes per batch × minutes per tool change × machine and labor burden × minutes-to-hours conversion) to the inputs above produces each figure below.
  • At this operating point the engine returns 372 $ for tool-change time cost, the number this scenario is built around.
  • At this operating point the engine returns 22,275 value for base product.
  • At this operating point the engine returns 0.02 x for multiplier.
  • At this operating point the engine returns 203 value for factor a x b.

How this compares with the baseline

  • Against the tool's baseline example, where tool changes per production batch sits at 18 changes and the headline result is 149 $, this scenario comes in 150% above the baseline at 372 $.
  • It computes the total burdened dollar cost of all tool changes in one batch by multiplying the number of changes, the minutes each one consumes, and your machine-plus-labor rate. 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

  • tool-change time cost: 372 $ (headline result)
  • Base product: 22,275 value
  • Multiplier: 0.02 x
  • Factor A x B: 203 value

Run it with your numbers

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

Last reviewed 2026-05-12.