Surgical Robotics Manufacturing worked example

Field Service Reserve at 50% annual intervention rate: a worked example in surgical robotics manufacturing

This worked example runs the field service reserve numbers for a tougher week than the baseline: 50% annual intervention rate instead of the typical 70%. Estimate the field service reserve to support an installed base of surgical robot systems over a period.

The inputs for this scenario

  • Installed systems in the field: 120 systems (held at the documented default)
  • Annual service cost per system: 4,200 $/system (held at the documented default)
  • Annual intervention rate: 50 % (the input this scenario stresses; the baseline uses 70)
  • Spares depot allowance: 25,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total service reserve = systems in field x service cost x intervention rate % + spares depot allowance.
  • Total field service reserve cost works out to 277,000 $ at these inputs, and this is the headline figure for the scenario.
  • Field service reserve cost per unit works out to 2,308 $ / piece at these inputs.
  • Variable field service reserve cost works out to 252,000 $ at these inputs.
  • Fixed field service reserve adder works out to 25,000 $ at these inputs.

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 26.68% below the baseline at 277,000 $.
  • Use it for annual service budgeting, warranty accrual, or pricing a service contract against the installed base. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total field service reserve cost: 277,000 $ (headline result)
  • Field service reserve cost per unit: 2,308 $ / piece
  • Variable field service reserve cost: 252,000 $
  • Fixed field service reserve adder: 25,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Field Service Reserve calculator, set annual intervention rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.