Aerospace & Defense Manufacturing worked example

CMM Inspection Capacity at 99% cmm machine uptime: a worked example

Push cmm machine uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a quality planner needs to check whether available CMM time can support an aerospace inspection queue

The inputs for this scenario

  • CMM checks per program cycle: 95 checks/cycle (unchanged)
  • Available CMM program cycles: 28 cycles (unchanged)
  • CMM machine uptime: 99 % (raised for this scenario; the documented default is 88)
  • Accepted first-pass inspection yield: 92 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross CMM capacity = checks per cycle × available CMM cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 2,423 accepted CMM checks for accepted cmm inspection capacity, the number this scenario is built around.
  • At this operating point the engine returns 2,660 accepted CMM checks for gross cmm inspection capacity.
  • At this operating point the engine returns 26.6 accepted CMM checks for cmm downtime loss.
  • At this operating point the engine returns 211 accepted CMM checks for inspection reject or rerun loss.

How this compares with the baseline

  • Against the tool's baseline example, where cmm machine uptime sits at 88% and the headline result is 2,154 accepted CMM checks, this scenario comes in 12.5% above the baseline at 2,423 accepted CMM checks.
  • It computes accepted CMM inspection capacity by derating gross capacity for machine uptime and first-pass accepted yield, and breaks out the downtime and rerun losses. 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

  • Accepted CMM inspection capacity: 2,423 accepted CMM checks (headline result)
  • Gross CMM inspection capacity: 2,660 accepted CMM checks
  • CMM downtime loss: 26.6 accepted CMM checks
  • Inspection reject or rerun loss: 211 accepted CMM checks

Run it with your numbers

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

Last reviewed 2026-05-12.