Single Minute Exchange of Dies (SMED) is a technique used to reduce change over or set up time between products.
Change over time is the time taken between the last good unit of previous product to the first good unit of new product. The Change over time affects the productivity and it should be reduced. SMED is the best technique to reduce this change over time. The steps for implementing SMED are explained below.
- Take a video shoot of the current change over process
- Analyze each step of the change over process
- Separate Internal and External activities
Internal: Activities done when the machine/equipment is in idle condition. These activities are done inside the machine. (e.g. Tool change).
External: Activities done when the machine/equipment is in operating condition. These activities are done outside the machine. (e.g. Arranging the tools required near the machine).
- Convert Internal into External Activities and Eliminate unwanted steps
The time for performing internal activities should be reduced. Look in the internal activities that can be done while the machine is in operating condition. Note those activities and write those in external activities section.
Also , eliminate unwanted steps from the overall change over process.
- Stream line Internal and External Activities
- Continuous Improvement: Practice and record the Before and After change over times and gradually reduce to less than 1 minute.
These are the detailed steps for implementing SMED in a changeover process.
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