CNC Machining worked example

Regrind Savings with tools sent out for regrinding of 60 tools: a worked example

Suppose tools sent out for regrinding falls to 60 tools. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate savings from regrinding cutting tools instead of buying replacement tools, after regrind cost and handling burden are included.

The inputs for this scenario

  • Tools sent out for regrinding: 60 tools (the input this scenario stresses; the baseline uses 120)
  • Net savings per reground tool vs new: 28 $ / tool (held at the documented default)
  • Fixed regrind program setup cost: 180 $ (held at the documented default)
  • Freight, inspection, and handling burden: 240 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Net regrind savings = tools sent for regrind × savings per reground tool + fixed regrind program cost + freight, inspection, and handling burden.
  • net regrind savings works out to 2,100 $ at these inputs, and this is the headline figure for the scenario.
  • savings per reground tool works out to 35 $ / piece at these inputs.
  • gross regrind savings works out to 1,680 $ at these inputs.
  • regrind program and handling deductions works out to 420 $ at these inputs.

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 44.44% below the baseline at 2,100 $.
  • It nets the per-tool savings across all reground tools against the fixed program cost and the freight-plus-inspection burden to give a true net regrind savings figure. 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

  • net regrind savings: 2,100 $ (headline result)
  • savings per reground tool: 35 $ / piece
  • gross regrind savings: 1,680 $
  • regrind program and handling deductions: 420 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Regrind Savings calculator, set tools sent out for regrinding to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.