Sheet Metal Stamping & Press Lines worked example
Coil Change Downtime at 7.2% downtime allowance: a worked example
Suppose downtime allowance falls to 7.2%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Running a coil through a stamping line takes a predictable base time, but coil ends, threading, and strip splices add downtime that planners must build in.
The inputs for this scenario
- Coil length to process: 120 units (held at the documented default)
- Line processing rate: 12 units / hr (held at the documented default)
- Downtime allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)
Working through the calculation
- The calculation starts from the formula this tool documents: Base coil change downtime time = required work รท processing rate.
- Adjusted run time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
- Base run time works out to 10 hr at these inputs.
- Allowance applied works out to 7.2 % at these inputs.
- Process rate works out to 12 pieces / min at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where downtime allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
- Computes coil-line run time by dividing coil work by the processing rate and inflating it with a downtime allowance factor. 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
- Adjusted run time: 10.72 hr (headline result)
- Base run time: 10 hr
- Allowance applied: 7.2 %
- Process rate: 12 pieces / min
Run it with your numbers
- To rerun this with your own numbers, open the live Coil Change Downtime calculator, set downtime allowance to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.