Los 7 desperdicios de Lean Manufacturing

Understanding the Seven Wastes in Lean Manufacturing

Introduction to Lean and Waste

• The concept of lean is continuously evolving, with various definitions due to its application across different industries beyond manufacturing, including administrative functions and healthcare.

• A core principle of lean production is the elimination or reduction of waste—actions that do not add value to processes.

Defining Waste

• Waste can be simply described as anything that does not add value; customers would not want to pay for actions that do not enhance their desired outcomes.

• Examples include unnecessary charges on a restaurant bill for errors or costs associated with idle machinery waiting for deliveries.

The Impact of Waste on Costs

• These wastes inflate product prices or reduce company profits, highlighting the importance of addressing them within lean practices.

• The seven wastes identified in manufacturing aim to eliminate causes of "mura" (unevenness), "muri" (overburden), and directly tackle "muda" (waste).

Understanding Muda, Mura, and Muri

• In Japanese discussions about waste, three terms are often referenced: "muda," which refers to non-value-added activities; "mura," indicating unevenness; and "muri," meaning overburdening processes or employees.

• The seven types of waste include:

• Overproduction: Producing more than what is needed by the customer.

• Inventory: Holding excess raw materials or finished goods without added value.

Additional Types of Waste

• Other forms include:

• Waiting: Time lost while machines or products await processing.

• Motion: Unnecessary physical movement by people or machines during operations.

• Transportation: Movement of products between locations unnecessarily.

Talent Utilization and Overprocessing

• Many also recognize additional wastes such as:

• Underutilized talent: Not leveraging employee skills effectively.

• Overprocessing: Performing more work than necessary based on customer requirements.

Causes Behind Waste

• Muri leads to stress in employees and inefficiencies in processes caused by unclear workflows, inadequate training, incorrect tools, and poorly designed performance measures.

• Addressing these root causes is essential for minimizing waste effectively.

Effects of Uneven Demand (Mura)

• Mura creates imbalances leading to inventory buildup when production rushes at month-end deadlines instead of aligning with actual customer demand.

• It’s recommended to smooth production flows according to real-time demand rather than arbitrary targets.

Summary of the Seven Wastes

• A visual summary highlights key points about each type of waste:

• Overproduction is considered one of the most serious wastes due to its cascading effects on inventory levels and supplier relationships.

Understanding Waste in Lean Manufacturing

The Impact of Waiting

• A significant amount of time in workplaces is wasted while waiting for responses from other departments, deliveries from suppliers, or repairs from engineers. This waiting disrupts workflow and is considered a waste.

Unnecessary Movement

• One fundamental principle of lean manufacturing is to minimize unnecessary movement by people, parts, or machines during processes. Excessive movements can lead to inefficiencies and increased stress.

• Examples of unnecessary movement include bending down to pick up heavy objects instead of having them at waist height and excessive travel between workstations. These movements consume time and resources.

Transportation Waste

• Transportation refers to the unnecessary movement of materials between processes, which adds no value to the product. Companies incur costs for moving materials without generating any benefit.

• High transportation waste can be costly due to the need for personnel and equipment like trucks or forklifts, leading to increased operational expenses.

Defects in Processes

• Defects are one of the most apparent wastes but can be challenging to detect before reaching customers. Quality errors often result in rework or replacement costs that exceed initial expectations.

• Preventing defects is crucial as they waste resources and may lead to customer loss. Implementing systems like automation can help reduce defect occurrences.

Overprocessing Issues

• Overprocessing occurs when processes exceed what is required by customers, such as using oversized equipment or overly strict tolerances. This leads to wasted time and money.

• An example includes using a large machine that operates faster than necessary but complicates scheduling and causes delays; smaller machines should be used where appropriate.

Profitability Through Waste Reduction

• To improve profitability, companies must focus on reducing costs by eliminating waste rather than solely increasing sales prices, which could drive customers away if perceived as too high or low.

• Customer satisfaction hinges on timely delivery of quality products at fair prices—achievable only by addressing the seven types of waste inherent in processes.

Implementing Lean Principles

• Eliminating these seven wastes can enhance customer satisfaction with products/services through timely delivery and quality assurance achieved via lean principles implementation.