Rare Earth Magnet & Motor Materials worked example

Coating Yield at 68% target coating yield rate: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target coating yield rate to 68%, then walk the calculation through step by step. Estimate coating yield for rare earth magnet and motor materials using production-ready inputs so teams can track KPI performance and decide whether corrective action is needed.

The inputs for this scenario

  • Conforming coated magnets (pass adhesion and thickness): 8 count (held at the documented default)
  • Total magnets processed through coating line: 250 count (held at the documented default)
  • Target coating yield rate: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Coating yield rate = coating yield count ÷ total coating yield population × 100.
  • Coating yield rate works out to 3.2 % at these inputs, and this is the headline figure for the scenario.
  • Coating yield gap to target works out to 64.8 points at these inputs.
  • Coating yield count works out to 8 count at these inputs.
  • Total coating yield population works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target coating yield rate sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target coating yield rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. A pass/fail count treats a pinhole reject and a full adhesion failure the same, so it does not tell you which defect mode is driving losses.

Results at a glance

  • Coating yield rate: 3.2 % (headline result)
  • Coating yield gap to target: 64.8 points
  • Coating yield count: 8 count
  • Total coating yield population: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Coating Yield calculator, set target coating yield rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.