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Just-in-Time production is a practice within lean manufacturing that makes items “just” at the time demand requires, and not for surplus inventory; its purpose is waste minimization.
Demand-driven instead of inventory-driven
Eliminating surplus eliminates waste and cost
Key aspect of lean manufacturing and TPS
Just-in-time manufacturing is a key principle of both the TPS and Lean methodologies, and because they tend to overlap, it is difficult to pinpoint the exact birthpoint of JIT philosophy.
Both TPS and Lean have similar goals: the elimination of waste, the standardization of production processes, and a pull methodology for supply chain management.
JIT is a critical element of both – and more – processes.
It would be reductive to contribute JIT to a single inventor because there are so many talented participants in creating lean manufacturing as a discipline. Here are some basic differentiations:
Just-In-Time is more of a philosophy than a checklist, but here are the most foundational elements of JIT. Keep in mind, however, that this list is not exhaustive, and other elements of JIT manufacturing may be more frequently used than others – or not at all – depending on the industry.
Standard workplace structure and organization, like shift exchange and administrative protocol
Aiming for the least wasteful and most efficient design and production plan to lower the overall frequency of defects
Preparing for flexible machinery changeover in least amount of time possible
Setting consistent standards of production for reliable output
Organizing production flow from beginning to end including interdepartmental communication
Applying multi-functional skillset development within the workforce
Relying on a stable platform for visual instructions, like work instruction software for assembly operations to ensure quality control
Operating machinery should be optimized before functioning to eliminate the possibility for failures as much as possible
The ease of the production process, measured by DFMEA
Interior design layout optimized the development of a product’s life cycle in assembly
Smooth material handling for least possible human disruption or contamination
Viewed as extensions of factory life cycle
Also known as cellular manufacturing, the organized division of labor including small group responsibilities
As opposed to push manufacturing, pull is when demand dictates the flow of production in order to best meet expectations with least waste possible
These days, when it comes to manufacturing methodologies, JIT is pretty much synonymous with lean manufacturing as a guiding principle. Astute readers of this lexicon will notice that many terms tend to overlap. These conceptual differences, from JIT to lean to Six Sigma, have a common constant that defines their occupational success: standardization.
Standardization is an overarching application of Standard Operating Procedures (SOPs) for an entire department or process that needs to be reliably consistent. Standardization is critical to ensure product uniformity regardless of production date or time.
A great example of improvements from standardization is the increased productivity and quality control when using VKS visual work instructions on an assembly line – the coordinated, accessible visuals support the maintenance of a diligent and replicable production process.
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