This document provides an overview of Lean Manufacturing (also known as Just-in-Time or JIT) concepts and implementation process. It discusses that Lean aims to eliminate waste from manufacturing operations to improve efficiency. The seven types of waste are identified as overproduction, inventory, waiting, transportation, overprocessing, motion, and defects. A five step process is outlined for implementing Lean: 1) analysis to identify non-value added activities, 2) choosing appropriate Lean solutions, 3) implementation, 4) verification of impact, and 5) standardization. Critical success factors are also discussed such as aligning with product costing methods and quality practices.
What is Lean Manufacturing? Lean Manufacturing is nothing but all about build a product in the most efficient and effective manner. This technique focuses on reducing waste and improving manufacturing processes.
What is Lean Manufacturing? Lean Manufacturing is nothing but all about build a product in the most efficient and effective manner. This technique focuses on reducing waste and improving manufacturing processes.
Toyota Production System or Lean Manufacturing has become an imperative to sustain the current hyper competitive scenario . This presentation looks at the basic tenets of Lean Manufacturing as a philosophy as well as a practicing regime.
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Toyota Production System or Lean Manufacturing has become an imperative to sustain the current hyper competitive scenario . This presentation looks at the basic tenets of Lean Manufacturing as a philosophy as well as a practicing regime.
Remote sensing and monitoring are changing the mining industry for the better. These are providing innovative solutions to long-standing challenges. Those related to exploration, extraction, and overall environmental management by mining technology companies Odisha. These technologies make use of satellite imaging, aerial photography and sensors to collect data that might be inaccessible or from hazardous locations. With the use of this technology, mining operations are becoming increasingly efficient. Let us gain more insight into the key aspects associated with remote sensing and monitoring when it comes to mining.
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A Memorandum of Association (MOA) is a legal document that outlines the fundamental principles and objectives upon which a company operates. It serves as the company's charter or constitution and defines the scope of its activities. Here's a detailed note on the MOA:
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Lean Manufacturing or Just-in-Time (JIT) originating from Japan (Toyota)
is the most established method for optimizing manufacturing opera-
tions. Many success stories confirm its underlying concepts’ effectiveness,
which can be applied in areas other than manufacturing (Lean Thinking,
Lean Healthcare, Lean Administration, etc.). Over the last few decades,
almost all major manufacturing companies have implemented at least
some basic concepts of Lean to increase efficiency, reduce costs, and
speed up product delivery.
However, many practical examples show that Lean is neither simple
to implement nor inexpensive. Lean is not a well-defined management
system with clearly defined implementation steps and rules. Some of
its concepts are difficult or impossible to implement in more complex,
non-repetitive manufacturing environments. Nevertheless, the essential
Lean concepts should be considered in any case for the following reasons:
• Lean is about waste reduction, an issue that was never more important
than these days ;
• Lean focuses on the improvement of the actual manufacturing and
logistic processes, the only way to achieve substantial cost and lead
time reductions ;
• Basic Lean principles can be implemented in any manufacturing envi-
ronment and result in clean, safe, and ergonomic workplaces ;
• Some essential benefits can be obtained without major investments ;
• Lean helps to reduce operational complexity and thus minimizes the
need for costly and complex planning solutions.
OVERALL PROCESS
MOTIVATION & CHALLENGES
CHEAT-SHEET: LEAN MANUFACTURING
Steps Description Essential questions
Identification of waste:
Identifying non-value-added activi-
ties for the whole supply chain..
• Before implementing Lean, have you reached a scrap- and rework level
constantly below 1%?
• Do you measure the costs caused by overproduction and excess
inventory?
• Have you segmented the products based on the product life cycle and
the volume and regularity of the demand?
Choice of Lean solutions:
Implementing the Lean solutions
based on the maturity level of the
Lean initiative.
• Do you understand the requirements for a successful implementation of
continuous-flow manufacturing?
• Have you identified non-value-added activities that can be removed
without high costs?
• Do you promote low-cost automation solutions?
• Do you focus your efforts on process improvements impacting the over-
all performance?
Continuous improvement:
Implementing Lean solutions in a
continuous improvement process.
• Do you have overall planning for the Kaizen events (current-state and
future-state value stream map)?
• Do you have a multi-functional team that is 100% available for
performing the Lean implementation (three to seven members)?
• Do you have defined a model area for testing the Lean concepts?
Measuring manufacturing
performance:
Verification of the impact of Lean
solutions.
• Do you have reliable performance metrics for quality, inventory,
customer service, and manufacturing costs?
• Do you measure your main products’ lead times (total time required to
manufacture an item, including run time, queue time, inspection time,
etc.)?
Standardized work:
Consolidating implemented solu-
tions and ensuring that the work
is always executed in the same
optimal way.
• Do you have product design rules in place to adapt products for effi-
cient assembly and production?
• Are all your processes responsible for guaranteeing the quality of their
output (quality at the source)?
• Are sales and purchasing promoting leveled customer and supplier
deliveries?
Step 2: Choice of
solutions
Step 3: Implementation
Step 4: Verification
Step 1: Analysis
Step 5: Standardization
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GENERAL CONCEPTS
PROCESS STEPS
Non-value-added activities or waste
Everything in Lean is about eliminating waste, activities that consume
resources but do not add value to the product or service. The genius
behind this concept is that manufacturing performance is maximized by
reducing waste instead of working harder or buying expensive equipment.
The seven forms of waste are defined as follows:
Overproduction: To produce sooner and in greater quantities than
customer demand and send parts to the next process step that are not
immediately required.
Typicalcauses:Toohighsafetystocklevels,over-optimisticsalesforecasts,
and poor product life cycle management (launch and end-of-life).
Inventory and WIP (Work-In-Progress): Obsolete and slow-rotating
inventories and high WIP levels.
Typical causes: Large batch sizes, unbalanced capacities, poor flow
between processes, and Overproduction.
Waiting: People or parts waiting for a process to be completed, for
resources, or decisions.
Typical causes: Poor coordination of activities, too many priorities, and
overloaded processes.
Transportation: Unnecessary transportation of people and parts between
processes, plants, and suppliers.
Typical causes: Large distances between processes, multiple storage loca-
tions, and lengthy and complex material handling systems.
Over-processing: Processing beyond the standard required by the
customer and unnecessary complex (over-engineered) processes.
Typical causes: Unclear customer specifications, lack of work standards,
and complex material handling.
Motion: Unnecessary movements of people, parts, or machines. This
waste is generally related to ergonomic problems.
Typicalcauses:Poorworkstationlayoutandworkplaceorganization,lack
of space, and searching for tools and equipment.
The process of implementing the whole Lean concept or individual solu-
tions follows the typical steps of any creative problem-solving approach:
1) Analysis, 2) Choice of solutions, 3) Implementation, 4) Verification, and
5) Standardization.
Step 1: Analysis
The following tools are essential, together with analyzing KPIs and
process data, to identify the operations’ current state and all non-val-
ue-added activities.
Genba walks: Genba walk means visiting the workplaces and aims to
understand how work is done. The goal of this methodology is that the
management understands the effectiveness of implemented solutions
and what improvement activities must be planned.
Spaghetti diagrams: A spaghetti diagram visualizes the flow of workers
and products in a process layout to identify potential areas of improve-
ment (Transportation, Motion, Waiting, and Inventory).
Value-stream mapping (VSM): VSM is a pencil-and-paper method
for visualizing the production flow by following a product’s produc-
tion path from beginning to end with the help of standardized symbols.
This tool is perfect for identifying the ratio between value-added and
non-value-added activities and wastes like Transportation, Waiting,
Defects, Inventory, and Overproduction. VSM is also used frequently for
planning all Lean activities (current-state value stream map representing
all current problems, and future-state value stream map representing
all planned improvements).
Defects: Rework, nonconformities in processes and products, accidents,
and breakages.
Typicalcauses:Unclearoperationinstructions,inadequateoperatorskills
and training, and incapable processes and suppliers.
Critical success factors
Lean is difficult to implement because it is contrary to some traditional
manufacturing practices and because the methodology does not explicitly
address all elements required to implement Lean successfully.
Lean goals vs. Product costing: Some standard costing practices and
performance metrics conflict with the goal of lead time reduction. Typical
examples are choosing large lot sizes to minimize direct costs-per-item
or to let run expensive resources even in periods without actual demand.
Quality at the source vs. Statistical process control: Continuous-flow
manufacturing is only possible if each process sends only “good” parts to
the following process. This concept differs from the classical approach of
statistical process control (accepting a certain scrap- and rework-level)
and quality inspection only at the end of the production process.
Improving manufacturing environment vs. Scientific management:
Scientific management uses sophisticated (IT-)methods to improve
performance. In contrast, Lean aims to reduce the complexity of the
manufacturing environment to allow simple and inexpensive solutions.
Quality level: All fundamental quality issues must be solved before
implementing Lean (scrap- or rework rates constantly below 1% to 2 %).
Product Design: Continuous-flow manufacturing is impossible if the
products are impractical for manufacturing and assembly. Therefore,
DFMA design guidelines (Design For Manufacturing and Assembly =
modular designs,use of standard parts, mistake-proofing techniques, and
easy and efficient fasteners) should be used for all main product families.
Demand and supplier management - Leveling: Lean solutions are
useless in an environment with constant demand surges and infre-
quent deliveries from suppliers. Long-term relationships with clients and
suppliers are often required to level demand and supply.
Step 2: Choice of solutions
A general approach for implementing Lean is first stabilizing the manu-
facturing environment before implementing in model areas continu-
ous-flow manufacturing and the Kanban method (pull concept).
Stabilization and visual workplace:
The following three Lean tools help to reduce the fundamental inefficien-
cies (Waiting, Inventory, Defects, Motion, and Transportation).
5S: The 5S method helps to ensure clean, safe, and ordered workplaces
and is the fundamental Lean solution. It consists of the following five
activities:
1. Sort: Sorting and removing all unnecessary items ;
2. Straighten: Arranging items for easy and ergonomic access. All
often-used items are placed closest to the workplace ;
3. Shine: Cleaning everything and solving all safety issues ;
4. Standardize: Creating visual guidelines for keeping the workplaces
organized, safe, and clean ;
5. Sustain: Educating and communicating to ensure that everybody
follows the standards.
SMED (Single Minute Exchange of Dies) or Quick Changeover: The
SMED method helps to minimize lot sizes by reducing changeover times.
Small lot sizes are an essential condition for continuous-flow manufac-
turing. It is implemented in the following three steps:
1. Internal and external setup tasks: Distinguish between internal
setup tasks that can only be performed while the machine is shut down
and external setup tasks that can be performed while the machine is
running ;
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2. Reducing internal setup tasks: Convert internal tasks to external
setup tasks when possible ;
3. Streamlining setup activities: Streamline all setup activities
by implementing parallel operations, eliminating adjustments, and
improving storage and management of required parts and tools.
TPM (Total Productive Maintenance): The TPM method focuses on main-
taining optimal conditions for the equipment to prevent breakdowns,
speed losses, and quality defects. It consists of the following activities:
1. Inspecting and cleaning equipment: Clean and inspect equipment:
Eliminate factors contributing to failure, eliminate sources of contam-
ination, and lubricate ;
2. Work standards: Establish standards for maintenance, cleaning,
and lubrication ;
3. Maintenance and inspection levels: Distribute the maintenance
and inspection tasks to the three levels Expert, Supervisor, and Operator.
4. Operator training: Train operators in performing basic inspection
and maintenance tasks (Operator level) ;
5. OEE (Overall Equipment Effectiveness): Establish the OEE measure-
ment for all critical equipment (OEE = Availability of machine x Perfor-
mance rate x Quality rate) ;
6. Standardization of inspection and maintenance: Introduce a
scheduled inspection and maintenance program.
Visual management: Visual management helps to communicate the
current state of the operations to everyone. These visuals cover generally
performance and quality indicators (KPIs), safety rules, production sched-
uling, and priorities. Visual management is also essential for controlling
and reducing inventory and WIP.
Continuous-flow manufacturing & Kanban method:
High production cost and lead time reductions can only be achieved by
introducing continuous-flow manufacturing that differs significantly
from the classical push and batch production. There exist two levels
of continuous-flow manufacturing, leveled and smoothed production:
Push and batch production: Function-oriented organization, central
inventory and waiting queues before every workstation (①), economic
batch sizes, and centralized planning (Material Requirements Planning
MRP) based on customer orders and forecasts (②).
Leveled production: Product-oriented organization with dedicated
resources or value-stream organization, FIFO (First-In, First-Out) lanes
to minimize WIP (③), shared resources controlled by Kanban method
(④), production scheduled by pacemaker process (⑤), and all products
(within product family) produced in a time interval (EPEI = Every Part,
Every Interval, the shorter the interval, the better, ⑥). Essential require-
ments for leveled production are products with similar work content,
low scrap- and rework rates (<1%), and reliable equipment (OEE > 70%).
Smoothed production: U-shaped production cells for minimizing waste
(⑦), one-piece flow with operation times equal to TAKT (= available daily
production time/average daily customer demand, ⑧), and all shared
resources and suppliers controlled by the Kanban method (④). Smoothed
production requires highly balanced work contents per operation.
Kanban (Pull): The Kanban method implements the pull concept, where
material replenishment is only allowed after the material has been
consumed. The client withdraws the needed items from the supermarket
(⑨) and sends a replenishment signal (= Kanban, card in Japanese) back
to the supplying process. The main advantage of the Kanban method
is that it limits WIP, which is essential for controlling lead times. This
method is only adapted for products with stable processes and demand.
Step 3: Implementation
All critical implementations of Lean solutions (modifications of the flow
of material, reorganization of entire departments, etc.) should be done
using the Kaizen approach. A typical Kaizen event (three – five days) is
organized as follows:
Planning and preparation: Select the area and the team (four – six
team members, including a Team leader and a Lean specialist). Collect,
if necessary, additional process data for analysis (equipment efficiency,
quality levels, lead times, etc.) ;
Day 1: The problem is analyzed, and possible solutions are developed
and chosen based on a creative problem solving approach ;
Day 2: The ideal solution is tested (simulation), and the implementation
is started ;
Day 3: Continuing implementation of the ideal solution ;
Day 4: Verification and presentation of the implemented solution.
Establish work standards and an action plan for non-finished issues.
Step 4: Verification
The verification of Lean solutions is done with the help of KPIs:
Plant-level: Customer service, DSI (Days Sales of Inventory), Quality,
Manufacturing costs, Delivery lead times, and Safety.
Department- or value-stream-level: First-time quality, Production lead
times, Employee skills matrix, and Equipment efficiency (OEE).
Step 5: Standardization
Standardizing is essential for consolidating the implemented improve-
ments and ensuring that the production process is always done in the
same efficient manner.
Typical work standards: Inspection and maintenance plans (inspection
frequency, parts to be replaced or inspected, lubrication instructions, etc.)
and work and safety procedures (sequence of the work process, necessary
tools, cycle times, and quality and safety requirements).
TAKT
TAKT
TAKT
TAKT
TAKT TAKT
FIFO FIFO
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT
TAKT TAKT
Orders
Supplier
Supplier Supplier
MRP
Push & Batch production
MRP Orders and forecasts
Smoothed production - One-piece flow
Leveled production - Every part in every interval
①
③
④
⑤
①
①
①
①
①
①
Clients Clients Clients
④ ④ ④
⑥
⑦
⑧
②
②
③
⑧
⑧
Work-
content
Work-
content
⑨ ⑨ ⑨
⑨
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Duggan K. Creating Mixed Model Value Streams – Practical Lean Techniques for Building to Demand, Productivity Press: A detailed description
of implementing Lean techniques in a high product mix environment with shared resources and unstable demand.
Hopp W., and M. Spearman. Factory Physics, Waveland Press, Inc.: A classic book about manufacturing control, with some essential insights about
Lean Manufacturing.
Lane G. Made-to-Order Lean – Excelling in a high-mix, low-volume environment, Productivity Press: How to implement Lean in a realistic
manufacturing environment with thousands of different products.
Rother M., and J. Shook. Learning to See – value-stream mapping to create value and eliminate muda, Productivity Press: A classic book on
value-stream mapping and the basic Lean concepts.
Shingo S., and A. Robinson. Modern Approaches to Manufacturing Improvement – The Shingo System, Productivity Press: A classic book from
the co-creator of the Toyota Production System and the Just-in-Time.
Takeda H. The Synchronized Production System – Going beyond Just-in-Time Through Kaizen, Kogan Page Publishers: A detailed explanation
of a step-by-step implementation of the different Lean Manufacturing tools and concepts.
Tapping D., T. Luyster, and T. Shuker. Value Stream Management – Eight Steps to Planning, Mapping, and Sustaining Lean Improvements,
Productivity Press: A detailed description of implementing Lean using the value stream mapping tool.
AUDIT
TO GO FURTHER...
The following audit helps evaluate the maturity level of the Lean Manufacturing initiative
People Process Tools
Level 4
Robust
The whole organization is actively
involved in the Lean initiative.
Most employee have participated at
least once in a Kaizen event.
Smoothed production for main prod-
ucts: Cellular manufacturing with
one-piece flow, speed of operations
dictated by TAKT, and all shared
resources and suppliers controlled by
the Kanban method.
The visual management of the opera-
tions allows non-specialists to identify
the current state of the operations.
The Lean improvement process is guided
by current-state and future-state value
stream maps
Level 3
Essential
Sales and Purchasing are promot-
ing smooth customer and supplier
deliveries.
The design department applies rules for
products that are practical and simple
to produce and assemble (DFMA).
Training programs are available and
promoted to train people in all aspects
of the Lean concept.
Leveled production for main products:
Product-oriented organization, all
products within the product family
produced in a time interval (EPEI), value
stream scheduled by pacemaker process,
and shared resources controlled by the
Kanban method.
The KPIs in place identify the impact of
Lean solutions and help to determine
the potential causes of a problem.
Level 2
Minimal
Cross-training program for operators
defined and applied.
The top management has defined lean
as a major initiative for improving
manufacturing processes.
A team is entirely available to imple-
ment Lean solutions.
Visual WIP and inventory control.
Visual management in place of safety,
quality, inspection, and maintenance
rules.
SMED and TPM are in place at all critical
operations (bottlenecks).
All workplaces are safe, clean, and
ordered (5S).
A model area available for testing lean
solutions.
Visual management tools are available:
Labels, markings, signs, whiteboards,
and FIFO racks and lanes for inventory
and WIP control.
KPIs with cause indicators exist for
quality, customer service, inventory,
delivery lead times, and equipment
efficiency (OEE).
Level 1
Insufficient
A limited number of people implement
Lean solutions locally.
No guidelines or standards exist for the
implementation of Lean solutions.
Complex flow of material, and frequent
rework and equipment stoppages.
Production schedules are dictated by
financial requirements, resulting in
frequent month-end rushes.
No indicators are available for measur-
ing delivery lead times and inventory
levels.