Mining Vehicle & Underground Equipment worked example

Field Service Buffer with field consumption rate per machine-day of 3,000 units / day: a worked example in mining vehicle & underground equipment

Push field consumption rate per machine-day up to 3,000 units / day and the picture changes. This example computes every intermediate figure at that operating point. Use it when field service buffer in mining vehicle and underground equipment is being sized for a buffer or safety stock review.

The inputs for this scenario

  • Field consumption rate per machine-day: 3,000 units / day (raised for this scenario; the documented default is 1,200)
  • Resupply lead time to the pit or portal: 85 days (unchanged)
  • Safety stock multiplier on lead-time demand: 1.1 units (unchanged)

Working through the calculation

  • Applying the documented formula (Field service buffer cycle stock = field service buffer daily usage × field service buffer lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 32.09 days for protected days of supply, the number this scenario is built around.
  • At this operating point the engine returns 35.29 days for unprotected days.
  • At this operating point the engine returns 3,000 pieces for inventory.
  • At this operating point the engine returns 85 pieces / day for daily usage.

How this compares with the baseline

  • Against the tool's baseline example, where field consumption rate per machine-day sits at 1,200 units / day and the headline result is 12.83 days, this scenario comes in 150% above the baseline at 32.09 days.
  • It computes cycle stock from daily usage times lead time, adds a safety-stock multiplier, and reports how many days of supply that protects against. 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

  • Protected days of supply: 32.09 days (headline result)
  • Unprotected days: 35.29 days
  • Inventory: 3,000 pieces
  • Daily usage: 85 pieces / day

Run it with your numbers

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

Last reviewed 2026-05-12.