Surgical Robotics Manufacturing worked example

Sterile Draping Cost at 99% first-pass acceptance at inspection: a worked example

What does the result look like when first-pass acceptance at inspection reaches 99%? The full calculation is worked below with real intermediate numbers. A manufacturing engineer uses this to cost a sterile drape program before committing to a build run.

The inputs for this scenario

  • Sterile drapes produced per run: 800 drapes (unchanged)
  • Loaded build cost per drape: 22 $/drape (unchanged)
  • First-pass acceptance at inspection: 99 % (raised for this scenario; the documented default is 92)
  • Tooling and fixture amortization: 1,200 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total draping cost = drapes produced x loaded build cost x first-pass acceptance % + fixture amortization) to the inputs above produces each figure below.
  • At this operating point the engine returns 18,624 $ for total sterile draping cost, the number this scenario is built around.
  • At this operating point the engine returns 23.28 $ / piece for sterile draping cost per unit.
  • At this operating point the engine returns 17,424 $ for variable sterile draping cost.
  • At this operating point the engine returns 1,200 $ for fixed sterile draping cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where first-pass acceptance at inspection sits at 92% and the headline result is 17,392 $, this scenario comes in 7.08% above the baseline at 18,624 $.
  • A figure at this level is achievable when first-pass acceptance at inspection is genuinely sustained, not just peaked for a shift. It applies first-pass acceptance as a cost multiplier rather than modeling full rework loops, so scrap that is reworked and recovered will make the variable figure conservative.

Results at a glance

  • Total sterile draping cost: 18,624 $ (headline result)
  • Sterile draping cost per unit: 23.28 $ / piece
  • Variable sterile draping cost: 17,424 $
  • Fixed sterile draping cost adder: 1,200 $

Run it with your numbers

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

Last reviewed 2026-05-12.