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Factory Layout Examples & How to Choose

Tim McLean – Managing Director will talk about the different Factory Layout Examples.

 

When developing a Lean factory layout, many people assume that the layout must be a “U”. However, the right solution for you will depend on your process and individual needs. Here are the main Lean factory layout types:

 

S Layout

With this Factory layout example the flow folds back on itself in an “S” shape. This layout is useful when there are many operations involved in the process and it is not possible to move these operations in to sub assembly cells.

Developing an S Shape Layout

Development of an S shaped layout

It uses space efficiently but has the disadvantage that the ends of the “S” can be closed leading to long material handling travel times.

 

Another problem is that the flow tends to start and finish in opposite corners of the factory.

 

A great lean factory layout example using an “S” layout is the layout that TXM developed for Rowing boat builder, Sykes racing. This product was physically long (up to 18 metres) and involved many production steps.

S Shape Layout example

Sykes Racing S shaped Layout being for 18m long product.

A big benefit of the “S” was that enabled good use of the “corners” of the “S”. The first corner allowed for composite curing and small FIFO buffer between the lay-up and assembly processes.

 

The second corner enabled the composite moulds to be returned back to where they started in the mould store, minimising the transport of empty moulds (and potential damage).

 

Read a Case Study about the Sykes Racing Lean Layout

 

View an Interview with Sykes Managing Director, Jeff Lawrence.

 

U Shaped Layout

In this factory layout example the raw materials enter one side of the “U” and the product travels around the “U” (usually in an anticlockwise direction) until the finished product or sub-assembly reaches the other end of the “U” where it is picked up.

 

Benefits of this Lean Factory Layout Example:

 

  • Input and output of parts is relatively close together so material handler can drop off raw materials and pick up finished goods in the same trip;

 

  • External movements of in-process part containers easier as full parts can be loaded from the outside of the “U” and picked up from the inside;

 

  • Eliminates the required space for WIP;

 

  • Make the supervision and visual control of operations easier;

 

  • Increases the ability of operators to work on more than one machine or workstation. This is particularly useful if you need to ramp output up or down.

 

  • Makes the implementation of teamwork easier as team members are working close together.

 

U shaped factory layout example

Example of operator motion within a U shape cell showing how the cell can be easily operated with two or three operators depending on desired output rates.

 

The benefits of the U Shape layout/cell are greatly reduced when large equipment or many processes are involved.

 

L Shaped Layout

 

An L shaped layout example is used when the layout flows around a corner. It is usually the least space efficient as it is hard to make use of the space on the inside of the L.

 

Also, material handling pathways to the outside of the “L” are often long. Product also starts and finishes in opposite corners of the layout.

 

However sometimes, as in the example pictured, an L shaped layout is the only option available and an “L” shape can sometimes be “wrapped” around the outside of a “U” shaped cell to extend the flow.

Example of a L shaped Layout

I Shaped Layout

 

The final Lean factory layout example that we will introduce is also the most common, the “I” shaped layout.

 

“I” shaped layouts are best for processes with a small number of process steps. Essentially the flow goes in a straight line with raw material fed in one end of the “I” and finished goods out the other.

 

Often “I” shaped layouts will be used for final assembly and will be fed by sub-assembly cells. This often produces very short lead times and small footprints.

 

Often several “I” shaped layouts will arranged in parallel for different products or else feeding in to a central flow in a “fish-bone”layout.

 

A great example of an “I” shaped layout was the layout we developed for Varian Inc for manufacture of emission spectroscopy equipment.

 

This layout featured several “U” shaped and “I” shaped sub-assembly cells feeding directly in to a short “I” shaped layout for final assembly.

Example of an “I”shaped layout