CNC Machining worked example

Regrind Savings with tools sent out for regrinding of 300 tools: a worked example

What does the result look like when tools sent out for regrinding reaches 300 tools? The full calculation is worked below with real intermediate numbers. evaluating whether regrinding cutting tools saves money for a CNC tool family or production program

The inputs for this scenario

  • Tools sent out for regrinding: 300 tools (raised for this scenario; the documented default is 120)
  • Net savings per reground tool vs new: 28 $ / tool (unchanged)
  • Fixed regrind program setup cost: 180 $ (unchanged)
  • Freight, inspection, and handling burden: 240 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Net regrind savings = tools sent for regrind × savings per reground tool + fixed regrind program cost + freight, inspection, and handling burden) to the inputs above produces each figure below.
  • At this operating point the engine returns 8,820 $ for net regrind savings, the number this scenario is built around.
  • At this operating point the engine returns 29.4 $ / piece for savings per reground tool.
  • At this operating point the engine returns 8,400 $ for gross regrind savings.
  • At this operating point the engine returns 420 $ for regrind program and handling deductions.

How this compares with the baseline

  • Against the tool's baseline example, where tools sent out for regrinding sits at 120 tools and the headline result is 3,780 $, this scenario comes in 133% above the baseline at 8,820 $.
  • A figure at this level is achievable when tools sent out for regrinding is genuinely sustained, not just peaked for a shift. It assumes every tool sent out comes back usable; tools that fail inspection or can only be reground a limited number of times before going out of spec are not modeled here.

Results at a glance

  • net regrind savings: 8,820 $ (headline result)
  • savings per reground tool: 29.4 $ / piece
  • gross regrind savings: 8,400 $
  • regrind program and handling deductions: 420 $

Run it with your numbers

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

Last reviewed 2026-05-12.