Transformers, Coils & Magnetics Manufacturing worked example
Bobbin Fill Factor at 65% line efficiency: a worked example
Suppose line 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. This calculator turns bobbins wound and winder run time into a throughput rate, then discounts it by line efficiency to give the effective, sustainable rate a winding cell actually delivers.
The inputs for this scenario
- Bobbins wound this shift: 1,200 units (held at the documented default)
- Winder run time: 8 hr (held at the documented default)
- Line efficiency (uptime × good rate): 65 % (the input this scenario stresses; the baseline uses 90)
Working through the calculation
- The calculation starts from the formula this tool documents: Raw bobbin fill factor = completed output ÷ 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 line 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 computes raw throughput as bobbins divided by run time, then multiplies by line efficiency to give the effective throughput you can schedule against. 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 Bobbin Fill Factor calculator, set line efficiency to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.