Changeover is where flexible plants either win or bleed. Every minute a line spends in setup is a minute it does not produce, and on a high-mix line those minutes dominate the availability loss. This playbook gives a continuous improvement manager a vendor-neutral method to cut changeover time with SMED, from the first video study to the long tail of small wins that compounds over a year.
Why changeover is the availability loss you can control
Of the Six Big Losses that erode overall equipment effectiveness, setup and adjustment is the one a continuous improvement team can attack with the least capital. It is pure availability loss: the line is staffed, powered and ready, yet it makes nothing. On a high-mix line that runs short batches, this SMED changeover reduction work often returns more capacity than chasing speed or scrap, because the lost time is concentrated and visible once you measure it.
The trap is that manual logs hide it. Hand-written setup times are rounded, batched and forgiven, so they understate the loss by the same 8 to 15 points that manual logs typically overstate OEE. Before you improve a changeover you have to see it honestly, in real conditions, across every shift and every operator.
What SMED actually changes
- Internal setup: work that can only happen while the machine is stopped.
- External setup: work that can be done while the machine is still running the prior job.
- Conversion: moving as much internal work as possible into external time.
- Streamlining: parallel tasks, quick clamps, presets and standard kits that shrink what remains.
The internal versus external split is the whole game
Shigeo Shingo’s insight was simple and durable: most of a changeover that looks unavoidable is actually external work trapped inside the stopped-machine window. Fetching tools, staging materials, finding the right program and pre-heating can all happen while the previous batch still runs. The first SMED pass rarely needs new equipment. It needs a disciplined separation of internal from external steps.
Start with a video study. Film three or four real changeovers on the target line, then watch them with the operators and tag every step as internal or external. The conversation is the deliverable. Operators see waiting, walking and searching that they had stopped noticing, and the room agrees on which steps can move outside the stop before anyone buys a single quick-change clamp.
| Step type | Example tasks | SMED action |
|---|---|---|
| External, before stop | Stage next tooling, pre-kit materials, load the program | Do while the line still runs |
| Internal, machine stopped | Swap die, change format parts, purge | Shorten with quick clamps and presets |
| Converted internal to external | Pre-heat, pre-position, pre-measure | Move into the running window |
| Adjustment and first-good | Trial runs, fine tuning to first good part | Standardize settings to cut trials |
At Nutriset, real-time monitoring of packaging OEE accompanied an improvement from 62 to 80 percent, 18 points in four weeks, with a 40 percent cut in changeover time through the SMED method.
Time your real changeovers, do not estimate them
Run a free 60-day pilot on one line and watch live changeover timing surface the internal and external split in real conditions.
Download the SMED changeover playbook
The video-study checklist, the internal versus external worksheet and the live-timing method. We send it to your work email.
Live changeover timing makes the method stick
A single video study delivers the first big cut. Sustaining it needs a continuous signal. With PerfTrak capturing every stop and the TeepTrak Box reading the line at the edge with no PLC, each changeover is timed automatically and tagged with a reason code, so the team sees setup time per product, per shift and per operator without anyone writing it down.
That visibility turns SMED from a one-off workshop into a habit. When a changeover drifts long, the team sees it the same day rather than discovering it in a month-end report. Setup time becomes a number people manage, and the gains hold instead of decaying back to the old baseline.
The long tail of small wins
The first SMED pass on a line can remove a large share of setup time, but the durable advantage comes from the long tail: a preset here, a parallel task there, a standard kit that saves a minute on every job. None of these are dramatic on their own, yet across hundreds of changeovers a year they compound into real capacity.
Treat each recurring changeover as a standard to be improved, not a fire to be fought. Capture the best known method, train every shift to it, and let the live data tell you when reality drifts from the standard. That discipline is what carries a line from a one-time cut toward world-class 85 percent OEE territory, where recovered hidden factory capacity of 30 to 45 percent stops being theoretical.
- Separate internal from external setup before buying any hardware.
- Run a video study with the operators and tag every step.
- Time live changeovers automatically so the gains hold across shifts.
- Work the long tail of small presets and standards until it compounds.
0 Comments