CNC Machining worked example

Scrap From Machining with scrapped machined parts of 35 parts: a worked example

This scenario runs the scrap from machining calculation on the strong side: scrapped machined parts of 35 parts, with every other input held at its documented default. estimating the financial impact of CNC scrap for a job, shift, part family, or corrective action

The inputs for this scenario

  • scrapped machined parts: 35 parts (raised for this scenario; the documented default is 14)
  • cost per scrapped part: 86 $ / part (unchanged)
  • containment and investigation cost: 350 $ (unchanged)
  • rework, remake, and disposal burden: 420 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total machining scrap cost = scrapped machined parts × cost per scrapped part + containment and investigation cost + rework, remake, and disposal burden) to the inputs above produces each figure below.
  • At this operating point the engine returns 3,780 $ for total machining scrap cost, the number this scenario is built around.
  • At this operating point the engine returns 108 $ / piece for scrap cost per scrapped part.
  • At this operating point the engine returns 3,010 $ for scrapped part value.
  • At this operating point the engine returns 770 $ for containment, rework, and disposal adders.

How this compares with the baseline

  • Against the tool's baseline example, where scrapped machined parts sits at 14 parts and the headline result is 1,974 $, this scenario comes in 91.49% above the baseline at 3,780 $.
  • Use it after a scrap event or at month-end to put a dollar figure on rejected CNC work and to compare the cost of scrap against the cost of prevention. 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 machining scrap cost: 3,780 $ (headline result)
  • scrap cost per scrapped part: 108 $ / piece
  • scrapped part value: 3,010 $
  • containment, rework, and disposal adders: 770 $

Run it with your numbers

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

Last reviewed 2026-05-12.