Rotational Molding worked example

Scrap/Rework Cost at 58% share of cost not recovered as regrind: a worked example in rotational molding

Suppose share of cost not recovered as regrind falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Scrap and rework cost captures the real money lost when rotomolded parts come out with pinholes, warpage, bridging, or short shots and either hit the regrind bin or go back through finishing.

The inputs for this scenario

  • Scrapped or reworked parts in the run: 100 units (held at the documented default)
  • Fully burdened cost per scrapped part: 45 $ / unit (held at the documented default)
  • Share of cost not recovered as regrind: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed rework setup and handling cost: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Scrap/Rework 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 share of cost not recovered as regrind sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • It computes the total and per-piece cost of scrap and rework for a run, weighting each part's cost by the share that can't be recovered and adding a fixed rework charge. 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 Scrap/Rework Cost calculator, set share of cost not recovered as regrind to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.