Find out what you need to know about Lean manufacturing

Lean manufacturing uses the principles of lean to minimize waste and maximize productivity. Learn how you can harness the power of Lean manufacturing to enhance your business processes.

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What is Lean manufacturing?

Manufacturing companies face a wide range of challenges. One of the most critical is how they can make the most of their available resources to avoid waste and maximize productivity. Lean manufacturing is a system of analyzing manufacturing processes using the core principles of what is known as Lean philosophy, also called Lean management, or even more directly, Lean.

The core Lean management principles

A Lean management system is designed to remove waste, cut down on overall operating costs, enhance innovation, and boost production levels. The Lean principles enable better collaboration across all levels in a company, can optimize production processes, reduce time to market and help you make the most of your workforce’s skills.

Lean methodology – a definition

So, what are Lean management and Lean manufacturing exactly? Lean is a methodology that was first developed by the Toyota automotive company in the 1940s. The basic idea behind Lean management principles is to focus on every process that adds value and remove any process that does not add value. With Lean methodology, an emphasis is placed on the need for continuous improvement. Lean techniques also place a focus on obtaining input from personnel at every level, from the factory floor to the boardroom. In this way, optimum methods of production can be identified and implemented.
 

 

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What is the difference between Lean management and Lean manufacturing?

When considering any type of Lean-based methodology, it is important to understand that while the implementation can differ, all Lean techniques derive from the same underlying philosophy. Lean thinking, in essence, is about continuously striving to add value and maximize productivity.  
 
At first glance, you may not recognize the difference between Lean management and Lean manufacturing. However, there is a distinction between these two Lean strategies.
 
Lean management is focused on senior management and business leaders committing to implementing a system of attaining excellence via continuous improvement. Lean manufacturing places the focus on continuously assessing processes to remove waste and enhance operational efficiencies across the board.

What is the difference between traditional and Lean manufacturing?

There are significant differences between traditional and Lean manufacturing techniques. A traditional manufacturing system will be driven by sales forecasts, products are produced based on expected customer demand; this is known as push manufacturing, whereas Lean manufacturing is driven by actual customer demand, known as pull manufacturing.
 
In a traditional manufacturing system, problems are seen negatively, change is driven by management, systems are not changed if they are working, all work processes are standardized, and processes rely on workers not making mistakes.
 
Under a Lean manufacturing system, however, mistakes are viewed as opportunities for improvement, all employees are empowered to promote change, the focus is on continuous improvement, standardized processes can be updated, and processes are error-proofed to eliminate any chance of mistakes occurring.

Who invented Lean manufacturing?

The philosophy of Lean is usually credited to the Japanese automotive company Toyota. In the 1940s, Toyota developed and implemented a strategy known as the Toyota Production System.
 
The Toyota Production System came about due to the efforts of three men: Sakichi Toyoda, who came up with a waste elimination concept known as Jidoka, Kiichiro Toyota, who developed the concept of Just-in-Time manufacturing, and Taiichi Ohno, who integrated the Just-in-Time system with the principles of Jidoka. Under the Toyota Production System, the focus is placed on continuously developing value-added processes to remove waste and enhance efficiency.
 
However, the story of Lean did not start with Toyota. Lean principles can be traced back to the early 1890s when American mechanical engineer Frederick Taylor published The Principles of Scientific Management. Taylor’s book outlines many of the grounding principles of scientific management techniques.
 
Taylor’s writings inspired Henry Ford to create a revolutionary assembly-line strategy based on continuous production and waste reduction. Sakichi Toyoda, Kiichiro Toyota, and Taiichi Ohno were all heavily influenced by Henry Ford’s methods.
 
Today, Lean manufacturing principles are used by a wide variety of industries, including the aerospace sector, automotive companies, the electronics industry, and even healthcare and fashion companies. Major corporations such as Harley Davidson, the Ford Motor Company, Intel, and Nike are well known for implementing Lean methodologies.

What are the tools of Lean manufacturing

Applying Lean manufacturing principles requires the use of a set of Lean tools that allow for the identification and elimination of waste. Common Lean manufacturing tools include:

5S system

A methodology that aims to enhance organization and productivity by focusing on five key principles: Sort, Straighten, Shine, Standardize, and Sustain.

Poka Yoke

A Japanese phrase that translates roughly to ‘avoid unexpected surprises’, Poka Yoke is a system where errors are eliminated by ensuring that a set of conditions must be met before each step of a process can be completed.

Just-in-Time

The just-in-time manufacturing model involves producing goods in response to demand, rather than creating an excess inventory or producing them beforehand.

Kaizen

The Kaizen philosophy is based on focusing on making small ongoing changes to attain continuous improvement.

Total Productive Maintenance

Also known as TPS, this system focuses on ensuring that manufacturing machinery and processes are always kept in optimal condition.

Kanban

The Kanban system is a well-known Lean management technique that works in conjunction with Just-in-Time methods to improve and manage workflows.

What are the five principles of Lean manufacturing?

Customer-Value

Focus on what is valuable for the customer. Optimize your processes to remove anything that does not add value for the customer.

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What are the seven wastes in Lean manufacturing?

Waste can be a complicated concept to grasp. To make it simpler to recognize waste, Toyota’s Taiichi Ohno developed seven types of waste to avoid:

Excess Inventory

Inventories must be kept to a minimum. This helps to identify defects and minimize lead times.

Inventory means raw materials, work-in-progress, and finished goods that are not immediately needed. Excess inventory can lead to waste due to increased carrying costs, obsolescence, and increased lead times. In addition, excess inventory can hide quality issues and defects, making it more difficult to identify and correct problems.

Wasting Time

There should never be idle workers or equipment that is not being used.

Time is a precious resource in Lean manufacturing. Wasting time occurs when workers or equipment are idle and not contributing to value-added activities. This can be due to inefficient processes, poor scheduling, or inadequate training.

Motion

Unnecessary motion refers to any movement of machinery, equipment, or workers that does not add value to the product. Examples of unnecessary motion include excessive walking, reaching, or bending.

Transportation

Transportation waste are unnecessary movement of goods, equipment, or people. This can be due to poor factory layout, inefficient processes, or lack of coordination between departments.

Defects

Defective products cause waste and must be eliminated.

Defects relates to errors or mistakes that result in scrap, rework, or customer complaints. Defects can be caused by poor quality control, inadequate training as well as design flaws.

Over-processing

Products should have only the features that add value to the customer.

Over-processing are any activites that adds cost but does not add value to the product. This can be due to over-engineering, excessive inspection, or use of high-cost materials.

Overproduction

Companies should implement Just-in-Time processes to ensure they produce only what the customer demands.

Overproduction occurs when a company produces more than what the customer demands. This can lead to excess inventory and increased costs. Just-in-Time (JIT) production is a Lean technique used to minimize overproduction by producing only what is needed, when it is needed, and in the quantity needed.

Challenges of Lean manufacturing

Changing to a Lean manufacturing model is not an easy process. It will not happen overnight or even in a matter of weeks. It takes considerable time to fully implement an optimal lean manufacturing strategy. There may be inherent organizational resistance to change. Lean principles can represent a major cultural shift and some workforces may be opposed to adopting them. It can be complicated to implement the new technology required for a lean system. Many companies find it hard to properly identify bottlenecks in their old processes. Once a Lean system is in place, it can be hard to properly maintain the improved systems.

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Lean manufacturing - Conclusion & Perspectives

Lean manufacturing processes in combination with Lean management tools can provide companies with powerful methodologies to enhance efficiency and boost production.
 
The waste elimination aspects of Lean manufacturing techniques can reduce overheads and dramatically improve productivity. Incorporating Lean daily management techniques such as the Gemba walk can raise morale and ensure that all possible ways of optimizing processes are identified.
 
Lean cost-reduction principles and the Lean philosophy of continuous improvement are used by top multinational corporations. However, any enterprise can utilize Lean manufacturing and Lean management techniques to become more agile, more dynamic, and more profitable.

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