Jewelry, Watches & Precision Luxury Goods worked example

Inspection Magnification Workload at 23% fatigue and re-inspection allowance: a worked example

Push fatigue and re-inspection allowance up to 23% and the picture changes. This example computes every intermediate figure at that operating point. Use when planning QC staffing for a production batch or estimating how long final inspection will take before shipping. Helps quality managers schedule inspection labor and avoid bottlenecks at the QC station.

The inputs for this scenario

  • Pieces to inspect under magnification: 75 pieces (unchanged)
  • Inspection throughput rate: 15 pieces / hr (unchanged)
  • Fatigue and re-inspection allowance: 23 % (raised for this scenario; the documented default is 20)

Working through the calculation

  • Applying the documented formula (Base inspection time = pieces to inspect รท inspection throughput rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 6.15 hr for scheduled inspection time, the number this scenario is built around.
  • At this operating point the engine returns 5 hr for base inspection time.
  • At this operating point the engine returns 23 % for fatigue and re-inspection allowance applied.
  • At this operating point the engine returns 15 pieces / min for inspection throughput rate.

How this compares with the baseline

  • Against the tool's baseline example, where fatigue and re-inspection allowance sits at 20% and the headline result is 6 hr, this scenario comes in 2.5% above the baseline at 6.15 hr.
  • It computes the scheduled inspection time in hours by dividing pieces by the inspection throughput rate and inflating the result by a fatigue and re-inspection allowance. 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

  • Scheduled inspection time: 6.15 hr (headline result)
  • Base inspection time: 5 hr
  • Fatigue and re-inspection allowance applied: 23 %
  • Inspection throughput rate: 15 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.