What is Single-Minute Exchange of Die (SMED)?
Developed by Shigeo Shingo, SMED focuses on simplifying and streamlining changeover activities to minimise downtime and improve manufacturing efficiency.
Despite its name, SMED does not necessarily mean completing changeovers in less than one minute. The term refers to achieving changeover times in single-digit minutes, typically under ten minutes, wherever practical.
Although originally developed for changing dies in manufacturing equipment, SMED principles can be applied to a wide range of production changeovers, including tooling changes, machine setups, cleaning procedures and product transitions.
Why is SMED Important?
Production changeovers can account for a significant amount of lost manufacturing time, particularly when equipment is used to produce multiple products or variations.
Long or inconsistent changeovers reduce equipment availability, limit production flexibility and can increase costs. Rushed or poorly controlled setups may also introduce quality defects, safety risks and unnecessary waste.
Applying SMED principles helps manufacturers:
- Reduce equipment downtime
- Improve production efficiency
- Increase flexibility between production runs
- Reduce setup errors and material waste
- Support smaller production batches
- Improve equipment availability
- Standardise changeover procedures
The aim is not simply to complete changeovers faster. It is to remove unnecessary activities while ensuring each setup is completed safely, accurately and consistently.
How Does the SMED Methodology Work?
SMED begins by examining the activities involved in a production changeover and identifying where time is being lost.
A central principle is the distinction between internal and external setup activities.
Internal activities can only be completed while the equipment is stopped, such as removing tooling or making certain machine adjustments.
External activities can be completed while the equipment is still operating, such as preparing tools, checking materials or reviewing instructions for the next production run.
By moving suitable activities outside the period of downtime, manufacturers can reduce the time equipment remains unavailable.
The process then focuses on simplifying remaining tasks, removing unnecessary movement, improving tool accessibility and standardising the sequence of work.
For example, preparing replacement tooling and materials before stopping a production line can reduce the time needed to switch between products.
SMED and Production Changeover
SMED is closely connected to production changeover, but the terms describe different things.
Production changeover is the process of switching equipment, materials or production settings between products or production runs.
SMED is a methodology used to analyse and improve that process, with the aim of reducing the time equipment is unavailable.
While SMED focuses on efficiency, successful changeovers still depend on accurate setup, quality checks and consistent execution.
Reducing downtime provides little benefit if incorrect settings or missed inspections lead to defects once production restarts.
How a Work Execution Layer Supports SMED
A Work Execution Layer helps manufacturers turn improved changeover procedures into consistent frontline activities.
Once a changeover has been analysed and streamlined using SMED principles, digital workflows can guide operators through the revised process, ensuring tasks are completed in the correct sequence.
Preparation activities, equipment settings, safety checks and quality inspections can be incorporated into the workflow, reducing reliance on memory or paper instructions.
As work is completed, timestamps, measurements, photographs and approvals can be captured to create reliable Work Execution Data.
This provides greater visibility into how changeovers are performed, helping manufacturers identify recurring delays, compare execution across shifts and support further continuous improvement.
How WorkfloPlus Supports SMED
WorkfloPlus provides a Work Execution Layer that helps manufacturing teams standardise and carry out improved production changeover procedures.
Operators can follow step-by-step digital workflows on mobile devices, tablets, desktops or hands-free smart glasses, with access to the latest approved instructions.
Preparation tasks, machine settings, cleaning requirements, safety checks and quality inspections can be included within each workflow. Photographs, measurements, timestamps and sign-offs are captured as work progresses, creating instant job reports and a clear audit trail.
By connecting standardised changeover procedures with frontline execution and evidence capture, WorkfloPlus helps manufacturers reduce variation, improve consistency and generate the operational data needed to support ongoing SMED improvements.
Related Terms
- Production Changeover
- Changeover Time
- Lean Manufacturing
- Continuous Improvement
- Discrete Manufacturing
- Digital Work Instructions
- Work Execution Layer
- Work Execution Data
Learn More
- Production Changeover – Understand the activities involved in switching manufacturing equipment between products.
- Changeover Time – Learn how changeover duration affects manufacturing efficiency and equipment availability.
- Work Execution Layer– Discover how frontline data supports performance analysis and continuous improvement.
- Digital Work Instructions – See how guided procedures improve changeover consistency and reduce setup errors.
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SMED: Single-Minute Exchange of Die Explained
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Learn what SMED is, how Single-Minute Exchange of Die reduces production changeover time and how digital workflows support lean manufacturing.
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Single-Minute Exchange of Die (SMED) is a lean manufacturing method for reducing production changeover time. Learn how it works and how standardised work execution supports continuous improvement.