Bearings, Gears & Power Transmission worked example

Precision Grinding Cost at 58% parts requiring precision grinding: a worked example

This worked example runs the precision grinding cost numbers for a tougher week than the baseline: 58% parts requiring precision grinding instead of the typical 80%. Estimate precision grinding cost for bearing races, shafts, gears, or bushings from grind quantity, cost rate, covered share, and fixed setup adders.

The inputs for this scenario

  • Components in grinding scope: 950 parts (held at the documented default)
  • Precision grinding cost per part: 7.25 $ / part (held at the documented default)
  • Parts requiring precision grinding: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed grinding setup and inspection cost: 1,100 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable precision grinding cost = grinding scope components × grinding cost per part × parts requiring precision grinding share.
  • Total precision grinding cost works out to 5,095 $ at these inputs, and this is the headline figure for the scenario.
  • Grinding cost per part works out to 5.36 $ / part at these inputs.
  • Variable precision grinding cost works out to 3,995 $ at these inputs.
  • Fixed grinding setup and inspection cost works out to 1,100 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where parts requiring precision grinding sits at 80% and the headline result is 6,610 $, this scenario comes in 22.92% below the baseline at 5,095 $.
  • Use it when quoting a bearing or gear lot, comparing grind suppliers, or evaluating whether a finish operation can be relaxed. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total precision grinding cost: 5,095 $ (headline result)
  • Grinding cost per part: 5.36 $ / part
  • Variable precision grinding cost: 3,995 $
  • Fixed grinding setup and inspection cost: 1,100 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Precision Grinding Cost calculator, set parts requiring precision grinding to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.