Water, Wastewater & Pump Systems Manufacturing worked example

Impeller Machining Cost at 110% share needing full machining: a worked example

This scenario runs the impeller machining cost calculation on the strong side: 110% share needing full machining, with every other input held at its documented default. a pump manufacturer needs to cost the machining of a batch of centrifugal impellers before releasing a job or quote

The inputs for this scenario

  • Impellers to machine: 120 impellers (unchanged)
  • Machining cost per impeller: 85 $ / impeller (unchanged)
  • Share needing full machining: 110 % (raised for this scenario; the documented default is 100)
  • Fixed setup and fixturing cost: 1,800 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total machining cost = impellers to machine x machining cost per impeller x share needing full machining + fixed setup and fixturing cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 13,020 $ for total impeller machining cost, the number this scenario is built around.
  • At this operating point the engine returns 109 $ / piece for impeller machining cost per unit.
  • At this operating point the engine returns 11,220 $ for variable impeller machining cost.
  • At this operating point the engine returns 1,800 $ for fixed impeller machining cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where share needing full machining sits at 100% and the headline result is 12,000 $, this scenario comes in 8.5% above the baseline at 13,020 $.
  • Use it when quoting an impeller machining job or choosing a batch size that spreads fixturing cost effectively. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total impeller machining cost: 13,020 $ (headline result)
  • Impeller machining cost per unit: 109 $ / piece
  • Variable impeller machining cost: 11,220 $
  • Fixed impeller machining cost adder: 1,800 $

Run it with your numbers

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

Last reviewed 2026-05-12.