Grain Milling, Dry Bulk Food & Feed Handling worked example

Grind Size Distribution at 61% sieve test efficiency factor: a worked example

This worked example runs the grind size distribution numbers for a tougher week than the baseline: 61% sieve test efficiency factor instead of the typical 85%. Estimate the practical rate for completing grind-size distribution checks by comparing sample weight processed through sieves or particle-size testing with test runtime and lab efficiency.

The inputs for this scenario

  • Ground sample weight tested: 24 lb (held at the documented default)
  • Particle-size sieve test runtime: 2 hr (held at the documented default)
  • Sieve test efficiency factor: 61 % (the input this scenario stresses; the baseline uses 85)

Working through the calculation

  • The calculation starts from the formula this tool documents: Raw grind-size test throughput = sample weight tested รท particle-size test runtime.
  • Effective throughput works out to 7.32 lb / hr at these inputs, and this is the headline figure for the scenario.
  • Raw grind-size test throughput works out to 12 lb / hr at these inputs.
  • Efficiency works out to 61 % at these inputs.
  • Runtime works out to 2 hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where sieve test efficiency factor sits at 85% and the headline result is 10.2 lb / hr, this scenario comes in 28.24% below the baseline at 7.32 lb / hr.
  • Use it when planning grind-size sampling frequency, sizing lab capacity, or justifying a faster sieve shaker or automated particle-size analyzer. 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

  • Effective throughput: 7.32 lb / hr (headline result)
  • Raw grind-size test throughput: 12 lb / hr
  • Efficiency: 61 %
  • Runtime: 2 hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Grind Size Distribution calculator, set sieve test efficiency factor to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.