Finishing worked example

Gun Flow Rate at 58% transfer efficiency: a worked example

Suppose transfer efficiency falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate effective coating flow from gun flow setting, spray time or passes, and transfer efficiency.

The inputs for this scenario

  • Gun flow setting: 0.8 lb / min (held at the documented default)
  • Spray time or pass factor: 1 x (held at the documented default)
  • Transfer efficiency: 58 % (the input this scenario stresses; the baseline uses 80)

Working through the calculation

  • The calculation starts from the formula this tool documents: Effective gun flow = gun flow setting × spray time or pass factor × transfer efficiency.
  • Effective rate works out to 0.46 lb / min at these inputs, and this is the headline figure for the scenario.
  • Base rate works out to 0.8 lb / min at these inputs.
  • Loss to inefficiency works out to 0.34 lb / min at these inputs.
  • Efficiency works out to 58 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where transfer efficiency sits at 80% and the headline result is 0.64 lb / min, this scenario comes in 27.5% below the baseline at 0.46 lb / min.
  • It computes the effective powder deposited per minute by multiplying the gun flow setting by a spray-time or pass factor and the transfer efficiency. 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

  • Effective rate: 0.46 lb / min (headline result)
  • Base rate: 0.8 lb / min
  • Loss to inefficiency: 0.34 lb / min
  • Efficiency: 58 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Gun Flow Rate calculator, set transfer efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.