Pump, Compressor & Rotating Equipment Assembly worked example

Unit Assembly Cost at 58% yield and good-unit capture rate: a worked example

Suppose yield and good-unit capture rate falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Unit Assembly Cost tells a rotating-equipment shop what one finished pump or compressor actually costs to build once yield and fixed setup are folded in.

The inputs for this scenario

  • Pumps or compressors assembled in the run: 100 units (held at the documented default)
  • Direct assembly labor and parts cost per unit: 45 $ / unit (held at the documented default)
  • Yield / good-unit capture rate: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed tooling and setup cost for the run: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Unit Assembly Cost cost = quantity × rate × capture factor + fixed cost.
  • Weighted cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Per piece value works out to 28.6 $ / piece at these inputs.
  • Captured value works out to 2,610 $ at these inputs.
  • Fixed adjustment works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where yield and good-unit capture rate sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • It computes total run cost as quantity x rate x capture factor plus fixed cost, then divides by quantity for a true per-unit assembly cost. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Weighted cost: 2,860 $ (headline result)
  • Per piece value: 28.6 $ / piece
  • Captured value: 2,610 $
  • Fixed adjustment: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Unit Assembly Cost calculator, set yield and good-unit capture rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.