CNC Machining worked example
Insert Cost Per Part with insert price of 45 $: a worked example
What does the result look like when insert price reaches 45 $? The full calculation is worked below with real intermediate numbers. calculating insert cost per part for turning, milling, grooving, boring, or indexable drilling operations
The inputs for this scenario
- Insert price: 45 $ (raised for this scenario; the documented default is 18)
- Usable edges × parts per edge: 240 parts (unchanged)
- Wear factor: 1 x (unchanged)
Working through the calculation
- Applying the documented formula (Insert Cost Per Part = insert price ÷ usable edges × parts per edge × wear or breakage factor) to the inputs above produces each figure below.
- At this operating point the engine returns 0.19 $ / part for base insert cost per part, the number this scenario is built around.
- At this operating point the engine returns 0.19 value for raw ratio.
- At this operating point the engine returns 1 x for conversion factor.
- At this operating point the engine returns 240 value for usable edges × parts per edge.
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 150% above the baseline at 0.19 $ / part.
- A figure at this level is achievable when insert price is genuinely sustained, not just peaked for a shift. It captures only the insert itself, not the toolholder, coolant, regrind, or the cost of scrapped parts when a chipped edge runs past its limit.
Results at a glance
- base insert cost per part: 0.19 $ / part (headline result)
- Raw ratio: 0.19 value
- Conversion factor: 1 x
- usable edges × parts per edge: 240 value
Run it with your numbers
- Every input above is editable in the live Insert Cost Per Part calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.