Weighing, Dosing & Loss-in-Weight Feeding worked example
Screw Feeder Rpm at 65% screw feeder rpm efficiency: a worked example
Suppose screw feeder rpm efficiency falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate screw feeder rpm for weighing, dosing & loss-in-weight feeding planning, quoting, troubleshooting, capacity review, or process improvement.
The inputs for this scenario
- Screw Feeder Rpm completed output: 1,200 units (held at the documented default)
- Screw Feeder Rpm runtime: 8 hr (held at the documented default)
- Screw Feeder Rpm efficiency: 65 % (the input this scenario stresses; the baseline uses 90)
Working through the calculation
- The calculation starts from the formula this tool documents: Raw screw feeder rpm = completed output รท runtime.
- Effective throughput works out to 97.5 units at these inputs, and this is the headline figure for the scenario.
- Raw throughput works out to 150 units at these inputs.
- Efficiency works out to 65 % at these inputs.
- Runtime works out to 8 hr at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where screw feeder rpm efficiency sits at 90% and the headline result is 135 units, this scenario comes in 27.78% below the baseline at 97.5 units.
- It divides completed output by runtime for a raw feed rate, then applies an efficiency factor to give the effective sustained rate. 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 throughput: 97.5 units (headline result)
- Raw throughput: 150 units
- Efficiency: 65 %
- Runtime: 8 hr
Run it with your numbers
- To rerun this with your own numbers, open the live Screw Feeder Rpm calculator, set screw feeder rpm efficiency to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.