Kanban: A Lean Manufacturing Tool
Kanban: A Lean Manufacturing Tool
                                                                                IntroducTION.......................................................... pg 1	
                                                                                          An Introduction to Kanban
                                                                                          -- Kanban Basics
                                                                                          -- Small Inventories
                                                                                Benefits.................................................................. pg 3
                                                                                          Benefits of Kanban
                                                                                Methods.................................................................... pg 4
                                                                                         Basic Methods of Kanban
                                                                                         -- Kanban Cards
                                                                                         -- Kanban Queues
                                                                                Implementation.................................................... pg 6
                                                                                          Implementation of Kanban
    pg   8       Collecting Data for Kanban                                               -- Universal Customer
                                                                                          -- Kanban Preparation
                                                                                          -- Kanban Design
                                                                                Data Collection................................................... pg 8
                                                                                          Collecting Data for Kanban
                                                                                          -- Process Measurement
                                                                                          -- Data Interpretation & Application
                                                                                Sustaining............................................................ pg 11
                                                                                          Sustaining Kanban
pg 11 Sustaining Kanban
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guide should verify all information with ANSI and OSHA sources directly.
 Introduction
An Introduction to Kanban
Most facilities share two common business goals - decrease costs and increase production. How managers go about
accomplishing these goals may vary, but most can be achieved with the aid of Kanban.
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Introduction
                                                Kanban Basics
                                                  In industrial-method terms, Kanban is known as a pull
                                                system. This means facilities stock inventory based almost
                                                entirely on orders placed. The inventory is then pulled
                                                through production purely by customer demand.
                                                  Kanban, however, offers greater efficiency than
                                                a traditional pull system. Kanban relies on limited
                                                inventories and visual markers to help workers improve
                                                efficiency. Customer orders are then easily tracked from
                                                start to end.
                                                Small Inventories
                                                  When Kanban was first developed in Japan, many
                                                facilities were starved for space. This made inventory
                                                storage difficult to find and very expensive. Facilities soon
                                                realized storing large inventories was not cost-effective.
                                                  To overcome this obstacle, Japanese managers began
                                                applying new methods to reduce inventories. Instead of
                                                stocking inventory based on projected demands, inventory
                                                was only stocked when customers demanded products.
                                                Many additional benefits were soon realized by these
     Kit includes:                              early implementations. As an example, facilities rarely
                                                overproduced because limited supplies naturally stop
     
                                                  For many traditional Western facilities, maintaining
          Premium Vinyl Tape                    small inventories may appear somewhat problematic.
                                                After all, large inventories are thought to keep a facility
               2"     • Blue
                      • Yellow
                      • White
                                                from running out of materials. With Kanban properly
                                                implemented, materials are always available to meet a
                                                facility’s production demands.
               4"     • Blue
                      • Orange
                      • Green
                                                  In addition to improving process flow, Kanban helps
                                                managers and workers control inventory size with
                                                strategically placed visual communication. These are
                      • Yellow                  generally colored markers placed near or under inventory
                      • White                   stocks to help workers easily monitor levels and rapidly
         Ribbon
                      • Black
                                                adjust to changes in customer demand.
• White
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 Benefits
Benefits of Kanban
By combining very simple controls and methods, Kanban will naturally create a “check-and-balance” system. Workers will no
longer be guided by facility-wide production goals. Instead, their goal is to ensure inventory stocks and individual production
duties keep up with customer order demands and don’t exceed them.
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 Methods
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Methods
Kanban Queues
  Warehouse floors are easily and economically marked
to indicate proper locations for palletized or other
large container storage. Kanban queues help visually
communicate dedicated storage locations to all workers.
Floor markings can be used help facilities organize
inventory or finished products. This visual communication
also makes inventory easy to locate and identify so stocks
are tightly controlled.
  In Fig 3, additional inventory in the upstream queue
at Station 1 alerts the operator at Station 2 to replenish
his own queue. Queues are restocked immediately so
customer orders are filled on time.
  When customer orders increase, production naturally
adjusts to meet these new demands. To avoid shortages,
program queues with a small, but necessary buffer.
Extra inventory within a process provides flexibility
so adjustments are seamless throughout a shift. Just
remember not to overstock buffers. The system depends
on limited inventories to function properly.
  For rolling, or other moving inventories, colors can be
designed into queues. Workers use these colors to help
maintain accurate stocks and improve process flow. In
Fig 4, queues are marked with stop-light coloring to help
station operators react to pulls in demand as it happens.
  With a properly programmed queue, time is never
wasted calculating upstream or a downstream demands.
Needs are visually communicated as stocks are removed.
Colors reveal downstream and upstream demands at a
                                                                                           Fig 3
glance ─ eliminating guesswork and overproduction.
Fig 4
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 Implementation
Implementation of Kanban
Teach the basics of Kanban to all employees during facility-wide meetings. How it will be implemented in your facility should be
understood by all to be truly successful.
  Kanban implementations can be as simple or complex as you make them. All require discipline and facility-wide support
to be successful. This is why it’s critical for all employees to understand the benefits of Kanban prior to implementation.
  Once management is prepared to implement Kanban, form an implementation team to develop and manage the system.
Invite personnel from all facility levels to participate as members of this team. Having teams with varied perspectives
invites more feedback for planning. For a truly successful implementation, teams should meet regularly so issues and
concerns can be discussed and resolved.
Universal Customer
   In a Kanban facility, workers are expected to treat
coworkers and managers as customers. Each employee
is asked to take it upon themselves to produce the best
possible products and services for their many customers.
  The philosophy benefits a process in many ways. For
example, station operators in an assembly line consider a
downstream station operator as a customer instead of just
a coworker. They are motivated to provide quality goods
and services downstream, which results in a higher quality          Benefits of “Universal Customer”:
product.
                                                                    ▪▪ Better communication
  Satisfying the needs of coworkers and managers should
be the goal of all employees. When a worker’s customers             ▪▪ Higher quality
are happy, it reflects positively on them. Satisfying the           ▪▪ Lower production costs
needs of others helps workers take a personal interest in
the job they do.                                                    ▪▪ Less wasted-time formulating ideas
  Treating coworkers and managers as customers has                  ▪▪ Reduced production lead times
always been much more than just a business philosophy                 Since Kanban helps workers focus on inventory and
in Japan. It’s traditional cultural. Some claim Japan’s             production efficiency, the system easily integrates with
dedication to satisfying the customer is the main reason            a number of popular Lean Manufacturing systems,
for their success.                                                  processes and philosophies.
  Japanese employees are credited as the first to formally            If your facility has not already implemented Lean,
apply universal customer to industrial manufacturing                Kanban is an excellent first step. An implementation
and did so as early as the 1960s. Since then, employees             shows how basic efficiency improvements are made
at facilities around the world have applied similar                 in Lean and the role visual communication plays. The
philosophies to improve other Lean methods and systems.             system is often used to pave the way for more complex
                                                                    implementations like Lean.
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Implementation
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 Data Collection
  Implementation teams should develop a disciplined               The following list describes several examples of common
schedule for data collection. Longer periods will provide         facility data collection guidelines:
more accuracy, but may be unrealistic for many processes.         ▪▪ Processes should be divided by individual finished
  In large facilities, with multiple processes, team                 products. Changeovers create separate processes.
members should be assigned to collect data from
                                                                  ▪▪ Data collectors should have access to computers to store
processes they are most familiar with. Refer to previously
                                                                     data electronically. Fig 5 shows process data stored in a
diagramed process steps to help with data collection
                                                                     Microsoft® Excel spreadsheet.
research.
                                                                  ▪▪ Videotaping the production of a single unit through a
  In Kanban, data is collected regularly from each
individual stage in a process. This generally provides data          complete production process offers valuable information.
collectors with measurable events occurring at each step.         ▪▪ To increase data collection efficiency, all production units
  Data collections should sample production times,                   and related components or materials should be assigned
maintenance times, downtimes and retooling times. In                 a reference number.
manufacturing, and some warehouse processes, units
produced and rejects are generally sampled for the
collection period.
  Collections must be regularly scheduled and occur                              BLEACHED FLOUR PROCESS
                                                                                  STATION 3 (Avg. per week)
over an established sampling period. Depending on
                                                                                    Product Number         75Q-211
the accuracy required, a collection period could be a
                                                                                                      E
                                                                                     Product Name          Bleached
week, several months or longer. Since Kanban works to
streamline processes, data collectors will find it much                             Production Rate         1498
                                                                                                           35 sec.
                                                                                 M
                                                                                       Batch Size             1
  To ensure the data is as accurate as possible, a calendar
of collection days should be created and provided to                                 Retooling Time        15 min.
                                                                       SA
Kanban team leaders. Collections must always fall within Preventative Maintenance 10 min.
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Data Collection
Process Measurement
  Kanban data collection should focus on measuring
the routine elements of a process. These are generally
measurements of time and production. As an example,
the assembly of a single component by a station might
be one measurement.
  Once team members define what data will be
collected, build a collection checklist for Kanban team
leaders to reference. Having a checklist ensures the
same process elements are always sampled. The goal
should always be to collect reliable data so process
modifications or adjustments are always accurate and             Data collection is an important step of Kanban that helps to
improve efficiency.                                                 assess what facility processes may need adjustment.
The following measurement examples are commonly used in manufacturing processes. Implementation teams will need to
research whether these measurements apply, or develop a more applicable set of measurements.
▪▪ Batch Size – The smallest number of units a station        ▪▪ Retooling Times – This is the average time it takes for
   produces in one production run. As an example, the            process tools to be changed over to produce a different
   batch size for canned beverage packaging is commonly          product. Lost time for shut-downs, clean-ups and start-ups
   six. Automated tools generally determine batch sizes in       are factored in.
   modern production facilities. Handmade items normally      ▪▪ Downtime – Any unscheduled stop in production. This
   have a batch size of one.                                     includes any unscheduled repair, employee emergency,
▪▪ Station Production Rate – The average number of               etc. Lunches, breaks and scheduled maintenance periods
   batches a station produces during the established             are not factored in.
   sampling period.                                           ▪▪ Reject Rate – All finished products and materials
▪▪ Production Order Demand – The average number of               removed from a process.
   orders demanded. This will help you calculate production
   requirements. As an example, a production order
   demand of 100 finished units might require 100 man
   hours to produce.
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Data Collection
Data Interpretation & Application                                    Depending on process type, many popular efficiency
                                                                   formulas can be used to calculate the efficiency of process
  As your implementation team compiles data, better
                                                                   elements.
comparisons will be possible and trends more apparent.
Comparisons may occasionally show unusual data. Never                In manufacturing, popular supply chain management
hesitate to retake a collection when this occurs. Incorrect        formulas are used to calculate the Reject Rate, Production
data diminishes Kanban’s effectiveness and can even                Unit, Production Time, Scheduled Production Time,
harm a process. This is why it is always better for data           Scheduled Retooling Time and Buffer Quantity. Once
collection to be accurate, than fast.                              Kanban team leaders select a formula for each, facility
                                                                   improvements can be tracked and displayed as a single
  Setting guidelines can help Kanban team leaders avoid
                                                                   facility Kanban Score.
common shortcuts and focus on consistency and accuracy.
As part of the guidelines, encourage team leaders to                  As your team begins to record Kanban Scores, use
research what’s really happening in a process. Document            the results of these calculations as your team’s basis
any unusual activities or discoveries as a routine part of         for process redesigns. As an example, converting raw
their collections. Data collectors will be the ears and eyes       material and component storage to Kanban queues will
of the process.                                                    likely decrease lengthy production times. Support team
                                                                   members’ creativity and ingenuity. They will be important
  Once complete, data should be transferred into an
                                                                   assets as you and your team tackle a redesign.
electronic spreadsheet. Format the spreadsheet to display
each process individually. Breaking data up by process               Over time, buffers used to ensure sufficient station
helps organize data into useful and accessible groups.             inventory should be fine-tuned. Research shipping terms,
Convert the spreadsheet into graphs and charts to                  production lead times, vendor lead times and a facility’s
provide a more complete picture of a process. Highlight            own level of comfort to set buffers. As adjustments are
improvements and issues.                                           made, Kanban scores should always improve. Help this to
                                                                   occur by keeping workers focused on meeting customer
  To make the most of your team’s data, develop a set of
                                                                   orders and eliminating over production.
simple formulas to help gauge efficiency for all facility
processes. This figure will be your Kanban score and can             Process stations generally find their optimum buffer
be calculated by averaging all process scores within a             quantity through trial and error. For example, a very small
facility. Track Kanban scores on a chart and share them            inventory buffer may result in stock shortages at one
with facility employees by displaying them on posters              station seven-days-a-year. By raising this level slightly, a
(Fig 6).                                                           station may completely eliminate shortages and, in turn,
                                                                   improve their Kanban Score.
                                                                     Consultants and books are often valuable resources.
                                                                   Both can provide detailed directions on how to apply
                                                                   specific Kanban methods. One of the more popular
                                                                   Kanban books is Kanban Made Simple by John M. Gross
                                                                   and Kennith R. McInnis. The book contains many useful
                                                                   process formulas to help your team tailor the right system
                                                                   for your specific process type.
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  Sustaining
Sustaining Kanban
Ensure Kanban continues to benefit the processes it’s
applied to. Use the following tips to help sustain Kanban for
the long-run.
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