SMED Full Form: Single-Minute Exchange of Die
Definition
SMED stands for Single-Minute Exchange of Die — a lean method, developed by Shigeo Shingo, for reducing machine changeover time to under ten minutes (a single-digit number of minutes) by doing as much setup work as possible while the machine is still running.
| Term | SMED (Single-Minute Exchange of Die) |
|---|---|
| In Hindi | सिंगल-मिनट एक्सचेंज ऑफ डाई (SMED) |
| Area | Production & quality |
| Search phrase | SMED full form |
| Try it | Lean manufacturing |
सिंगल-मिनट एक्सचेंज ऑफ डाई (SMED) — हिंदी में अर्थ
SMED का पूरा नाम Single-Minute Exchange of Die है — शिगेओ शिंगो द्वारा विकसित लीन तरीका, जिसमें मशीन चलते रहने के दौरान ही अधिकतम सेटअप काम करके मशीन बदलाव (चेंजओवर) का समय दस मिनट से कम किया जाता है।
Internal vs external setup
Internal setup can only be done with the machine stopped — removing the old die, clamping the new one. External setup can be done while the machine runs — fetching the next die, preheating it, keeping bolts and tools ready, getting the first-off inspection gauges. Most changeovers in Indian job shops are slow because external work is being done during stoppage.
The SMED steps
1. Video and time the current changeover. 2. Separate internal and external activities. 3. Convert internal to external wherever possible (pre-staging, preheating, pre-setting tools off-line). 4. Streamline what remains — quick clamps instead of bolts, standard die heights, locating pins instead of trial adjustment, two people working in parallel. 5. Standardise it in a changeover checklist and train everyone.
Shorter changeovers make small batches economical, which cuts WIP and finished stock and lets you respond to urgent orders.
Example
A 250-tonne press took 90 minutes to change dies. Pre-staging dies and tools on a trolley, standardising shut height and using hydraulic clamps cut it to 22 minutes. With four changeovers a shift, that frees about 4.5 hours of press time per shift.
Related tools and guides
Frequently asked questions
What is the full form of SMED?
Single-Minute Exchange of Die — changeovers in single-digit minutes, i.e. under ten.
What is the difference between internal and external setup?
Internal setup needs the machine stopped; external setup can be done while it runs.
Does SMED only apply to press dies?
No. It applies to any changeover — moulds, CNC fixtures and programs, paint colour changes, packing line formats.
How does SMED improve OEE?
Changeover time is lost availability, so shorter changeovers raise availability and OEE directly.
Related terms
- 5 Whys (root cause analysis)The 5 Whys is a root cause analysis technique in which a team asks 'why?' repeatedly — typically about five times — starting from a problem, until it reaches a cause that, if fixed, stops the problem coming back.
- 5S5S is a workplace organisation method with five steps: Sort (Seiri), Set in order (Seiton), Shine (Seiso), Standardise (Seiketsu) and Sustain (Shitsuke).
- CAPA (Corrective and Preventive Action)CAPA stands for Corrective and Preventive Action — a structured process to find the root cause of a quality problem, fix it so it does not recur (corrective), and stop similar problems before they occur (preventive).
- DMAIC (Six Sigma)DMAIC — Define, Measure, Analyse, Improve, Control — is the five-step, data-driven problem-solving method used in Six Sigma to improve an existing process by finding and removing the root causes of defects and variation.
- First pass yield (FPY)First pass yield (FPY) is the percentage of units that pass a process step correctly the first time, without rework, repair or scrap. FPY = units passed first time ÷ units entering the step × 100.
- Fishbone diagram (Ishikawa)A fishbone diagram, also called an Ishikawa or cause-and-effect diagram, lays out all the possible causes of a problem in categories along the 'bones' of a fish whose head is the problem, so that a team can brainstorm and then test the likely ones.