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April 24, 2018

Avoid These 8 Types of Waste to Improve Your Lean Manufacturing Process

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lean manufacturing processLean manufacturing is a management philosophy that aims to reduce waste in all its forms from the production process. While the seeds of this approach can be found in the writings of Benjamin Franklin and Henry Ford, it was executives at the Toyota Corporation who codified and expanded what we call the lean manufacturing process. Toyota’s managers identified seven (later eight) basic types of waste, proposed solutions for each, and used their system to turn Toyota from a small manufacturer to one of the largest in the world.

The Eight Types of Waste

Mantec, a Pennsylvania-based consulting firm that helps manufacturers with efficiency and compliance, identifies eight potential types of waste, which can be abbreviated using the acronym “DOWNTIME.” They are identical to the seven formulated by Toyota, with the added insight of workers’ wasted potential.

  1. Defects: Time wasted to inspect and correct errors.
  2. Overproduction: Producing ahead of demand.
  3. Waiting: Time workers waste waiting for their colleagues or materials.
  4. Non-Utilized Skills: Failure to recognize and embrace employees’ full potential.
  5. Transportation: Unnecessary shipping, packing, and loading.
  6. Inventory: Money and storage space wasted on unused materials.
  7. Motion: Extra walking or other movement caused by a poorly designed work area.
  8. Extra Processing: Wasted labor due to inefficient tools, engineering, or management.

The Importance of Kaizen

“Kaizen” is the Japanese word for “improvement.” In relation to the lean manufacturing process, it refers to the idea that there is no such thing as “good enough” – there is always the opportunity for greater efficiency. Even if a production line couldn’t be smoother, managers must prepare for the future and consider long-term stability.

5S and Kanban

Lean manufacturing only offers managers an ideological framework to improve their organization; diagnosing problems and implementing their solution are left to the executives. However, most devotees of lean manufacturing agree that two basic principles – 5S and Kanban – can elegantly address many of the sources of waste.

5S is a set of five guidelines for cleanliness, so named because they all begin with ‘S’: Sort, Set in Order, Shine, Standardize, and Sustain. They essentially state that workplaces should be organized and spotlessly clean for not only efficiency, but also workers’ safety and comfort, and there should be measures in place to guarantee that the cleanliness is maintained.

Kanban is a system that guarantees production never gets ahead of distribution and consumption. Kanban cards – once actual cards, now often digital signals – are used to tell management that a material has run out and must be replenished. Ordering goods and commissioning work only after the last round is complete ensures that storage space is never wasted, time is never spent on projects that don’t sell, and the organization is more resilient to change.

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