Definition: a Changeover is the process of converting a production line or a machine from running one product to another.
The time required for a C can vary between 1 minute to several weeks in the case of automobile manufacturers when they change the assembly line for a new model.
The total C time consists of 3 phases ('up's):
- CLEAN-UP - removal of previous product, materials and components from the line.
- SET-UP - the process of actually converting the equipment, adjusting and/or replacing it.
- START-UP - the process of fine tuning the equipment after it has been restarted. There could still be jams, stoppages, quality rejects, etc.
SMED is a concept for realizing fast C times.
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