Long changeover times are expensive twice: first as downtime, and then as everything they force on you — large batches, high inventory, long lead times and poor flexibility towards customers. The good news: changeover time is one of the most rewarding places to improve, because the gains can typically be harvested through organisation rather than investment.
Planning is built on “batching orders” so you switch as rarely as possible
The changeover time varies enormously — depending on who does it
People search for tools, rolls and recipes while the machine stands idle
The first parts after a changeover are routinely scrapped during adjustment
Preparation that could happen while the machine runs (finding tools, fetching material, preparing the recipe) happens only once it has stopped. That is the classic and biggest source of wasted downtime.
When each operator has their own sequence and their own tricks, the variation is large, training hard and improvement impossible — there is no shared starting point to improve from.
Without fixed reference points and first-time-correct settings, every changeover becomes a trial-and-error process with scrap and extra time as a result.
Break the changeover into individual activities and ask of each: can it be moved to external time? Can it be simplified? That alone typically reveals 30-50% of the potential.
Preparation trolleys, pre-fetched tools, prepared recipes and a fixed checklist before the stop. The machine stop should contain only what physically requires an idle machine.
The best known method becomes the standard — visual, at the machine, trained with all shifts. And every time someone finds a better way, the standard is updated.
The operations check asks 8 questions and gives a concrete, preliminary diagnosis with a prioritised first step. Free, no sign-up, 4 minutes.