Bearings, Gears & Power Transmission worked example

Bearing Grinding Throughput at 63% grinding cell uptime: a worked example

Suppose grinding cell uptime falls to 63%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate accepted bearing grinding output from parts per cycle, available cycles, grinder uptime, and first-pass size or finish yield.

The inputs for this scenario

  • Bearing parts ground per cycle: 12 parts/cycle (held at the documented default)
  • Available grinding cycles: 520 cycles (held at the documented default)
  • Grinding cell uptime: 63 % (the input this scenario stresses; the baseline uses 88)
  • First-pass grinding yield: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross bearing parts ground = bearing parts per cycle × available grinding cycles.
  • Accepted grinding output works out to 3,774 parts at these inputs, and this is the headline figure for the scenario.
  • Gross bearing parts ground works out to 6,240 parts at these inputs.
  • Parts lost to grinder downtime works out to 2,309 parts at these inputs.
  • Parts requiring rework or scrap works out to 157 parts at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where grinding cell uptime sits at 88% and the headline result is 5,272 parts, this scenario comes in 28.41% below the baseline at 3,774 parts.
  • It computes accepted (sellable) ground bearing parts by taking parts-per-cycle times available cycles, then derating for grinding cell uptime and first-pass yield. 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

  • Accepted grinding output: 3,774 parts (headline result)
  • Gross bearing parts ground: 6,240 parts
  • Parts lost to grinder downtime: 2,309 parts
  • Parts requiring rework or scrap: 157 parts

Run it with your numbers

  • To rerun this with your own numbers, open the live Bearing Grinding Throughput calculator, set grinding cell uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.