SMED (Single-Minute Exchange of Die)

SMED is a lean method for slashing changeover time — ideally to single-digit minutes — by separating setup tasks that can be done while the machine runs from those that need it stopped, then streamlining both. Faster changeovers enable smaller batches and more flexibility.

SMED converts 'internal' setup steps (only possible when stopped) into 'external' ones (done while running), then simplifies and standardises what remains. Dramatically shorter changeovers cut downtime, allow smaller economic batch sizes, reduce inventory and let a plant respond faster to demand — a key enabler of lean flow and one-piece-flow ambitions.

Related terms

Lean Manufacturing · OEE (Overall Equipment Effectiveness) · Unplanned Downtime

Where this applies

Reducing changeover time with SMED · Standardising line changeovers