Rare Earth Magnet & Motor Materials worked example

Grinding Loss with magnet material loss rate of 6 units / hr: a worked example

This worked example runs the grinding loss numbers for a tougher week than the baseline: magnet material loss rate of 6 units / hr instead of the typical 12 units / hr. Estimate grinding loss for rare earth magnet and motor materials using production-ready inputs so teams can budget material or utility usage and compare it with actual consumption.

The inputs for this scenario

  • Magnet Material Loss Rate: 6 units / hr (the input this scenario stresses; the baseline uses 12)
  • Grinding Line Runtime: 8 hr (held at the documented default)
  • Cost per Unit of Ground-Away Material: 3.5 $ / unit (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Grinding loss consumed = grinding loss use rate × grinding loss runtime.
  • Grinding loss consumed works out to 48 units at these inputs, and this is the headline figure for the scenario.
  • Grinding loss run cost works out to 168 $ at these inputs.
  • Grinding loss runtime works out to 8 hr at these inputs.
  • Grinding loss unit cost works out to 3.5 $ / unit at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where magnet material loss rate sits at 12 units / hr and the headline result is 96 units, this scenario comes in 50% below the baseline at 48 units.
  • Use it to size stock allowances, cost a finishing operation, or build the case for capturing high-value grinding swarf for reclaim. 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

  • Grinding loss consumed: 48 units (headline result)
  • Grinding loss run cost: 168 $
  • Grinding loss runtime: 8 hr
  • Grinding loss unit cost: 3.5 $ / unit

Run it with your numbers

  • To rerun this with your own numbers, open the live Grinding Loss calculator, set magnet material loss rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.