Mass Finishing, Deburring & Polishing worked example

Cost Per Part at 58% billable share of finishing cost: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop billable share of finishing cost to 58%, then walk the calculation through step by step. Calculate cost per part for mass finishing, deburring & polishing planning, quoting, troubleshooting, capacity review, or process improvement.

The inputs for this scenario

  • Parts finished in the run: 100 units (held at the documented default)
  • Finishing cost rate per part: 45 $ / unit (held at the documented default)
  • Billable share of finishing cost: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed setup and media cost: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Cost Per Part 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 billable share of finishing cost sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to billable share of finishing cost, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It uses a single blended cost rate; multi-step processes with different rates per operation should be costed stage by stage.

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 Cost Per Part calculator, set billable share of finishing cost to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.