Bearings, Gears & Power Transmission worked example

Bearing Grinding Throughput at 99% grinding cell uptime: a worked example

Push grinding cell uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a bearing manufacturer needs to confirm whether a grinding line can cover planned inner race, outer race, roller, or component demand

The inputs for this scenario

  • Bearing parts ground per cycle: 12 parts/cycle (unchanged)
  • Available grinding cycles: 520 cycles (unchanged)
  • Grinding cell uptime: 99 % (raised for this scenario; the documented default is 88)
  • First-pass grinding yield: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross bearing parts ground = bearing parts per cycle × available grinding cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 5,930 parts for accepted grinding output, the number this scenario is built around.
  • At this operating point the engine returns 6,240 parts for gross bearing parts ground.
  • At this operating point the engine returns 62.4 parts for parts lost to grinder downtime.
  • At this operating point the engine returns 247 parts for parts requiring rework or scrap.

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 12.5% above the baseline at 5,930 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. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Accepted grinding output: 5,930 parts (headline result)
  • Gross bearing parts ground: 6,240 parts
  • Parts lost to grinder downtime: 62.4 parts
  • Parts requiring rework or scrap: 247 parts

Run it with your numbers

  • Every input above is editable in the live Bearing Grinding Throughput calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.