CNC Machining calculator
Scrap From Machining Calculator
Use this calculator to quantify machining scrap in the same cost language used for quotes and production reviews. It helps quality engineers and shop managers prioritize root-cause work on tool wear, offsets, setup errors, material defects, or inspection misses.
What this calculator does
- Estimate the cost of scrapped machined parts from scrap quantity, part cost, fixed investigation cost, and rework or disposition burden.
- estimating the financial impact of CNC scrap for a job, shift, part family, or corrective action
- The result shows the financial impact of machining scrap for prioritizing corrective action.
Formula used
- Total machining scrap cost = scrapped machined parts × cost per scrapped part + containment and investigation cost + rework, remake, and disposal burden
- Scrap cost per scrapped part = total machining scrap cost ÷ scrapped machined parts
Inputs explained
- scrapped machined parts: Count parts that cannot be shipped or recovered within specification for the scope being reviewed.
- cost per scrapped part: Include material, machining, tooling, outside processing, and value added before the part was scrapped.
- containment and investigation cost: Include inspection sort, engineering review, customer containment, or corrective-action cost.
- rework, remake, and disposal burden: Include remake setup, expedited production, disposal, handling, or administrative cost tied to the scrap event.
How to use the result
- Use it when reviewing scrap reports, quoting risk, or deciding whether process capability work is justified.
- Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.
Common questions
- What is the scrap from machining calculator for? It estimates total cost caused by scrapped CNC parts.
- What information should I enter? Use scrap count, value per part, containment cost, and remake or disposal burden from the same event.
- What does the result tell me? The result shows the financial impact of machining scrap for prioritizing corrective action.
- When is the result only an estimate? Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.
Last reviewed 2026-05-12.