CNC Machining worked example

Insert Cost Per Part with insert price of 9 $: a worked example

Suppose insert price falls to 9 $. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate insert cost per machined part from insert price, usable cutting edges, parts per edge, and wear factor.

The inputs for this scenario

  • Insert price: 9 $ (the input this scenario stresses; the baseline uses 18)
  • Usable edges × parts per edge: 240 parts (held at the documented default)
  • Wear factor: 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Insert Cost Per Part = insert price ÷ usable edges × parts per edge × wear or breakage factor.
  • base insert cost per part works out to 0.04 $ / part at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 0.04 value at these inputs.
  • Conversion factor works out to 1 x at these inputs.
  • usable edges × parts per edge works out to 240 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where insert price sits at 18 $ and the headline result is 0.08 $ / part, this scenario comes in 50% below the baseline at 0.04 $ / part.
  • It computes the dollar value of insert tooling consumed per finished part by dividing the insert price across the total parts all usable edges produce, scaled by a wear or breakage factor. 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

  • base insert cost per part: 0.04 $ / part (headline result)
  • Raw ratio: 0.04 value
  • Conversion factor: 1 x
  • usable edges × parts per edge: 240 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Insert Cost Per Part calculator, set insert price to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.