Surgical Robotics Manufacturing worked example

Field Service Reserve at 81% annual intervention rate: a worked example in surgical robotics manufacturing

What does the result look like when annual intervention rate reaches 81%? The full calculation is worked below with real intermediate numbers. A service operations manager uses this to fund the next-year field service budget for the installed fleet.

The inputs for this scenario

  • Installed systems in the field: 120 systems (unchanged)
  • Annual service cost per system: 4,200 $/system (unchanged)
  • Annual intervention rate: 81 % (raised for this scenario; the documented default is 70)
  • Spares depot allowance: 25,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total service reserve = systems in field x service cost x intervention rate % + spares depot allowance) to the inputs above produces each figure below.
  • At this operating point the engine returns 433,240 $ for total field service reserve cost, the number this scenario is built around.
  • At this operating point the engine returns 3,610 $ / piece for field service reserve cost per unit.
  • At this operating point the engine returns 408,240 $ for variable field service reserve cost.
  • At this operating point the engine returns 25,000 $ for fixed field service reserve adder.

How this compares with the baseline

  • Against the tool's baseline example, where annual intervention rate sits at 70% and the headline result is 377,800 $, this scenario comes in 14.67% above the baseline at 433,240 $.
  • A figure at this level is achievable when annual intervention rate is genuinely sustained, not just peaked for a shift. It applies one blended intervention rate to the whole fleet; a bimodal base with aging early units and newer systems will need separate cohorts to avoid under-reserving the older ones.

Results at a glance

  • Total field service reserve cost: 433,240 $ (headline result)
  • Field service reserve cost per unit: 3,610 $ / piece
  • Variable field service reserve cost: 408,240 $
  • Fixed field service reserve adder: 25,000 $

Run it with your numbers

  • Every input above is editable in the live Field Service Reserve calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.