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Changeover Time: What It Is, and How It Differs from Cycle Time
Changeover time is the clock from the last good part of one product to the first good part of the next: everything it takes to switch a line over. It’s planned downtime. It gets mixed up with cycle time, but cycle time is how long one unit takes to make; changeover time is the gap between two different products.
Why is changeover time important?
Changeover time matters because every minute spent switching a line over is planned downtime, capacity you have paid for but cannot sell. Long changeovers push teams toward large batches and more inventory, which slows the whole plant and hides other problems. Cutting it with methods like SMED frees capacity and lifts overall equipment effectiveness (OEE).
What does changeover time include?
It’s more than swapping a tool, which is why it adds up:
- Stopping and clearing the last job.
- Removing and fitting tools, dies or fixtures.
- Setting and adjusting parameters.
- The first-off checks and trial pieces until quality is right.
- Only when a good part comes out is the changeover really done.
How does changeover time differ from cycle time, and how do you cut it?
Changeover time vs cycle time at a glance
The switch versus the unit.
| Aspect | Changeover Time | Cycle Time |
|---|---|---|
| Measures | Switch between products | Time to make one unit |
| Counts as | Planned downtime | Run time |
| Ends when | First good part of the next job | One unit is complete |
| Cut by | SMED | Process improvement |
Related Terms
- Batch Production – long changeovers push toward big batches.
- Batch Size 1
