Download - Jit(1) SHIVANI
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Just-in-Time andLean Operations
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Producing only what is needed, when it is needed (not early, not late; not less, not more)
Achieving high volume production using minimal inventories
An integrated but simplified system
JIT’s mandate: Elimination of all waste in production effort
What is JIT ?What is JIT ?
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JJust-in-Timeust-in-Time
Just-in-time (JIT): A highly coordinated processing system in which goods move through the system, and services are performed, just as they are needed
Supplies and components are ‘pulled’ through the system to arrive where they are needed when they are needed (just-in-time)
A management philosophy of continuous and forced problem solving by attacking the root causes
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Lean ProductionLean Production
JIT JIT lean production lean productionLean Production supplies customers with exactly Lean Production supplies customers with exactly
what the customer wants, when the customer what the customer wants, when the customer wants, without waste, through continuous wants, without waste, through continuous improvementimprovement
JIT operates with very little fatJIT operates with very little fat
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Attacks wasteAttacks waste (a (anything not adding value to the nything not adding value to the productproduct))
Achieves streamlined productioAchieves streamlined production bn by reducing y reducing inventoryinventory
Exposes problems and bottlenecks caused by Exposes problems and bottlenecks caused by variabilityvariability
What Does Just-in-Time Do?What Does Just-in-Time Do?
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Goal of JITGoal of JIT
The ultimate goal of JIT is a The ultimate goal of JIT is a balanced systembalanced system.. ((Achieves a smooth, rapid flow of materials through the Achieves a smooth, rapid flow of materials through the systemsystem))
The supporting goals are: The supporting goals are: Eliminate disruptionsEliminate disruptions Make the system flexibleMake the system flexible Eliminate waste, especially excess inventory Eliminate waste, especially excess inventory
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SummarySummary::JIT Goals and Building BlocksJIT Goals and Building Blocks
Product Design
ProcessDesign
PersonnelElements
Manufactur-ing Planning
Eliminate disruptions
Make the system flexible Eliminate waste
Abalancedrapid flow
UltimateGoal
SupportingGoals
BuildingBlocks
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Waste is ‘anything other than the minimum amount of equipment, materials, parts, space, and worker’s time, which are absolutely essential to add value to the product.’
— Shoichiro Toyoda President, Toyota © 1995 Corel Corp.
Quotation by Shoichiro ToyodaQuotation by Shoichiro Toyoda
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Sources of WasteSources of Waste
OverproductionOverproductionWaiting Waiting Unnecessary transportationUnnecessary transportationInventoryInventoryInefficient work methodsInefficient work methodsInefficient processingInefficient processingUnnecessary motionsUnnecessary motionsProduct defectsProduct defects
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Waste in OperationsWaste in Operations (1 of 3) (1 of 3)
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Waste in OperationsWaste in Operations (2 of 3) (2 of 3)
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Waste in OperationsWaste in Operations (3 of 3) (3 of 3)
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Waste Reduction (%)
82%
50%
50%
30%
30%
20%
40%
0% 20% 40% 60% 80% 100%
Work-in-Process Inventory
Raw Material Inventory
Lead Time
Space
Finished Goods Inventory
Scrap
Setup Time
JIT Reduced WasteJIT Reduced Wasteat Hewlett-Packardat Hewlett-Packard
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KaizenKaizen Philosophy (1 of 3) Philosophy (1 of 3)Continuous improvement
Requires total employee involvement
Essence of JIT is willingness of workers to
Spot quality problems
Halt production when necessary
Generate ideas for improvement
Analyze problems
Perform different functions
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Kaizen PhilosophyKaizen Philosophy (2 of 3) (2 of 3)Waste is the enemyImprovement should be done gradually and
continuouslyEveryone should be involvedBuilt on a cheap strategyCan be applied anywhere
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Kaizen Philosophy (Kaizen Philosophy (3 of 33 of 3))
Supported by a visual systemFocuses attention where value is createdProcess orientedStresses main effort of improvement should come
from new thinking and work styleThe essence of organizational learning is to learn
while doing
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Big JIT – broad focusVendor relationsHuman relationsTechnology managementMaterials and inventory management
Little JIT – narrow focusScheduling materialsScheduling services for production
Big vs. Little JITBig vs. Little JIT
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JIT Building BlocksJIT Building Blocks
In order to achieve competitive advantage through In order to achieve competitive advantage through JIT, the necessary building blocks should be installed JIT, the necessary building blocks should be installed
The building blocks can also be regarded as JIT The building blocks can also be regarded as JIT success factors or the basic elements of JITsuccess factors or the basic elements of JIT
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JIT Building BlocksJIT Building Blocks1. Product design
2. Process design
3. Personnel/organizationalelements
4. Manufacturing planning and control
5. Supplier relationships (supplier networks)
6. Preventive maintenance
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JIT Building Blocks: 1. JIT Building Blocks: 1. Product DesignProduct Design
Process design with product design
Standard product configuration and standart parts
Reduced number of parts
Modular design
Concurrent engineering
Highly capable production systems
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JIT Building Blocks: 2. JIT Building Blocks: 2. Process DesignProcess Design
• Small lot sizes• Setup time reduction• Cellular layout (Manufacturing cells)• Reduced Inventories (Limited WIP)• Continuous quality improvement• Production flexibility (multifunctional workers,
general purpose machines)• Balanced system• Fail-safe methods
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Small-Lot ProductionSmall-Lot Production
Requires less space & capital investmentMoves processes closer togetherMakes quality problems easier to detectMakes processes more dependent on each other
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A
A A B B B C
JIT Small Lots
Large-Lot Approach
Time
Time
A A B B B C
A A A B B B B B B C C
JIT produces same amount in same time if setup times are lowered
Small versus Large LotsSmall versus Large Lots
Small lots also increase flexibility to meet customer demands
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Comparison of Level and Large Lot Comparison of Level and Large Lot Material-use ApproachesMaterial-use Approaches
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Benefits of Small Lot SizesBenefits of Small Lot Sizes
Reduces inventory
Less storage space
Less rework
Problems are more apparent
Increases flexibility
Easier to balance operations
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Single-Minute ExchangeSingle-Minute Exchange
• Single-minute exchange of die (SMED): A system for reducing changeover time
• Categorize changeover activities• Internal – activities that can only be done while
machine is stopped• External – activities that do not require stopping the
machine
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LayoutLayoutJIT objective: Reduce movement of people and material
Movement is waste!JIT requires work-cells for product families (group
technology)movable, changeable, flexible machineryshort distanceshigh level of workplace organization and neatnessreduced space for inventorydelivery directly to work areasbalanced workstation capacities
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Cellular LayoutsCellular Layouts
Group dissimilar machines in manufacturing cell to Group dissimilar machines in manufacturing cell to produce family of partsproduce family of parts
Work flows in one direction through cellWork flows in one direction through cell Cycle time adjusted by changing worker pathsCycle time adjusted by changing worker paths Decreasing set-up timesDecreasing set-up times
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Worker Routes Lengthened as Volume Worker Routes Lengthened as Volume DecreasesDecreases
Cell 5Cell 5
Worker Worker 22
Cell 2Cell 2
Worker Worker 11
Cell 1Cell 1
Worker Worker 33
Cell 3Cell 3 Cell 4Cell 4
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Layout TacticsLayout Tactics
• Build work cells for families of products• Minimize distance• Design little space for inventory• Improve employee communication• Use poka-yoke devices• Build flexible or movable equipment• Cross train workers to add flexibility to layout
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Quality Improvement (1 of 4)Quality Improvement (1 of 4)
JIT exposes quality problems by reducing inventoryJIT eliminates number defects with small lotsJIT requires quality by suppliersTeam approach and continuous improvement are
important for ensuring qualityQuality is maintained by the following procedure:
Find the root cause of the problem, solve permanently and use team approach in solving the problems
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Quality Improvement (2 of 4)Quality Improvement (2 of 4)
JIT requires TQMStatistical process controlContinuous improvementWorker involvement & empowered employees
Inspect own workQuality circles
Immediate feedback
Failsafe methods such as poka-yoke (prevents defectives)
Quality at the source
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Quality Improvement (3 of 4)Quality Improvement (3 of 4)
JIT requires1) Quality within the firm
• Autonomation (jidoka): automatic detection of defects during production
2) Quality by suppliers
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Quality Quality Improvement (4 of 4)Improvement (4 of 4)
Jidoka assures quality at the source
Andon lights signal quality problems
Visual control makes problems visible
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Visual ControlVisual Control (1 of 3) (1 of 3)
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Visual ControlVisual Control (2 of 3) (2 of 3)
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Visual ControlVisual Control (3 of 3) (3 of 3)
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Production FlexibilityProduction Flexibility • Overall objective is to achieve the ability to process a
mix of products in a smooth flow.• Eliminate bottlenecks
• Reduce downtime by reducing changeover time• Use preventive maintenance to reduce breakdowns• Cross-train workers to help clear bottlenecks• Use many small units of capacity • Use off-line buffers• Reserve capacity for important customers
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A Balanced SystemA Balanced System
• Balanced system: Distributing the workload evenly among work stations
• Work assigned to each work station must be less than or equal to the cycle time
• Cycle time is set equal to the takt time• Takt time is the cycle time needed to match the pace of
production to customer demand for final product
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Streamlined ProductionStreamlined Production
Flow with JIT
Traditional Flow
CustomersSuppliers
Customers
Suppliers
Production Process (stream of water)
Inventory (stagnant ponds) Material
(water in stream)
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Traditional: inventory exists in case problems arise JIT objective: eliminate inventory JIT requires
Small lot sizesLow setup timeContainers for fixed number of parts
JIT inventory: Minimum inventory (raw material, WIP and finished goods) to keep the system running
Specialized bins for holding previously set number of parts
InventorInventoriesies
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JIT Inventory TacticsJIT Inventory Tactics
Use a pull system to move inventory
Reduce lot size
Reduce setup time
Develop Just-in-Time delivery systems with suppliers
Deliver directly to point of use
Perform-to-schedule
Use group technology
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Limited Work in ProcessLimited Work in Process• Benefits
• Lower carrying costs• Less space• Increased flexibility• Aids scheduling• Saves cost of rework and scrap
• Two general approaches• Kanban – focuses on individual work stations• Constant work in process (CONWIP) – focuses on
the system as a whole
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Inventory Hides Problems Just as Water in a Inventory Hides Problems Just as Water in a Lake Hides RocksLake Hides Rocks
Unreliable supplier
Setup time
Late deliveries
Quality problems
Process downtime
ScrapSetup time
Late deliveries
Quality problems
Process downtime
Inventory level
Inventory level
İnefficient layout
Bad design
Machine breakdown
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Scrap
Work in process inventory level(hides problems)
Unreliable Vendors
Capacity Imbalances
Lowering InventoryLowering Inventory Reduces Waste Reduces Waste
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Scrap
Reducing inventory exposes problems so they can be solved.
Unreliable Vendors
Capacity Imbalances
WIP
Lowering InventoryLowering Inventory Reduces Waste Reduces Waste
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Scrap
Reducing inventory revealsReducing inventory revealsproblems so they can be solved.problems so they can be solved.
Unreliable Vendors
Capacity Imbalances
WIP
Lowering InventoryLowering Inventory Reduces Waste Reduces Waste
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JIT Building Blocks: JIT Building Blocks: 3. 3. Personnel/Organizational ElementsPersonnel/Organizational Elements• Workers as assets
• Cross-trained workers
• Employee empowerment
• Continuous improvement
• Cost accounting
• Leadership/project management
• Commitment
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Employee EmpowermentEmployee EmpowermentEmployee empowerment• Empowered and cross-trained employees (to help clear
bottlenecks)• Get employees involved in product & process
(employees know the job best!)• Few job classifications to ensure flexibility of employees• Training support
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Bottom-round Management Style & Bottom-round Management Style & CommitmentCommitment
Commitment• Support of management, employees and suppliers
Any improvement must be made in accordance with the scientific method, under the quidance of a teacher, at the lowest possible level in the organization (Toyota Production System’s work rule)
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JIT Building Blocks: JIT Building Blocks: 4. 4. Manufacturing Planning and Manufacturing Planning and
ControlControl• Uniform production levels
• Level loading (level schedules)
• Pull systems
• Visual systems
• Reduced transaction processing
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Uniform ProductionUniform Production
Results from smoothing production requirementsKanban systems can handle +/- 10% demand
changesSmooths demand across planning horizonMixed-model assembly steadies component
production
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• Reduce ripple effect of small variations in schedules (e.g., final assembly)
• Production quantities evenly distributed over time (e.g., 7/day)
• Build same mix of products every day• Results in many small lots• Item Monthly Quantity Daily
QuantityA 40 2B 60 3
Level SchedulesLevel Schedules
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Mixed-Model SequencingMixed-Model Sequencing
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JIT Scheduling TacticsJIT Scheduling Tactics
Involves timing of operationsScheduling in JIT requires• Level loading (level schedules)• Zero deviation from schedules (performing to schedules)• Suppliers informed about schedules• Small lots (seeking one-piece-make and one-piece
move)• Making each operation produce a perfect part • Kanban techniques
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Pull/Push SystemsPull/Push Systems
Pull system: System for moving work where a workstation pulls output from the preceding station just as it is needed. (e.g. Kanban)
vs.
Push system: System for moving work where output is pushed to the next station as it is completed
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The Pull SystemThe Pull System
Material is pulled through the system when needed
Reversal of traditional push system where material is pushed according to a schedule
Forces cooperationPrevent over and underproduction
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Kanban Production Control SystemKanban Production Control System (1 of 2) (1 of 2)
Kanban: Card or other device that communicates demand for work or materials from the preceding station
Japanese word meaning “signal” or “visible record” may be a card, or may be a flag, ball etc.
Paperless production control systemKanban card indicates standard quantity of productionUsed often with fixed sized container
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Kanban Production Control SystemKanban Production Control System (2 of 2) (2 of 2)
The kanban cards provide direct control (limit) on the amount of work-in-process between cells.
Derived from two-bin inventory system Maintains discipline of pull production Signifies an authority to pull or produce which comes from a
downstream process Production kanban authorizes production Withdrawal kanban authorizes movement of goods
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A Sample KanbanA Sample Kanban
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Determination of the Number of Kanbans Determination of the Number of Kanbans Needed Needed
Setting up a kanban system requires determining the number of kanbans (or containers) needed.
Each container represents the minimum production lot size
An accurate estimate of lead time required to produce a container is key to determining how many kanbans are required
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Determination of the Number of Kanbans-Determination of the Number of Kanbans- Kanban Formula Kanban Formula
N = DT(1+X)C
N = Total number of containers
D = Planned usage rate of using work center
T = Average waiting time for replenishment of parts plus average production time for a container of parts
X = Policy variable set by management - possible inefficiency in the system
C = Capacity of a standard container
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JIT Demand-Pull LogicJIT Demand-Pull Logic
Customers
Sub
Sub
Fab
Fab
Fab
Fab
Vendor
Vendor
Vendor
Vendor
Final Assembly
Here the customer starts the process, pulling an inventory item from Final Assembly…
Here the customer starts the process, pulling an inventory item from Final Assembly…
Then sub-assembly work is pulled forward by that demand…
Then sub-assembly work is pulled forward by that demand…
The process continues throughout the entire production process and supply chain
The process continues throughout the entire production process and supply chain
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Kanban Signals “Pull” Material Kanban Signals “Pull” Material Through the ProcessThrough the Process
Storage Part A
Storage Part AMachine
Center Assembly Line
Material Flow
Card (signal) Flow
Withdrawal kanban
Once the Production kanban is received, the Machine Center produces a unit to replace the one taken by the Assembly Line people in the first place
This puts the system back where it was before the item was pulled
The process begins by the Assembly Line people pulling Part A from Storage
Production kanban
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JIT Building Blocks: JIT Building Blocks: 5. Supplier Relationships5. Supplier Relationships
Reduced number of vendors Supportive supplier relationships Quality deliveries on time Frequent deliveries in small lot quantities Reduced lead times Reduced transaction processing Certified vendors
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JIT partnerships are formedJIT partnerships eliminate:
Some unnecessary activitiesIn-plant inventoryIn-transit inventoryPoor suppliers
SuppliersSuppliers
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Few
Nearby
Long-term relationships
Analysis and support to enable desirable suppliers to become or stay price competitive
Buyer resists vertical integration and subsequent wipeout of supplier business
Suppliers encouraged to extend JIT to their suppliers (2nd and 3rd tier suppliers)
Characteristics of JIT PartnershipsCharacteristics of JIT PartnershipsSuppliers
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Traditional Supplier NetworkTraditional Supplier Network
BuyerBuyer
SupplierSupplierSupplierSupplier SupplierSupplier SupplierSupplier
SupplierSupplier
SupplierSupplier
SupplierSupplier
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Tiered Supplier NetworkTiered Supplier Network
SupplierSupplier
SupplierSupplier
SupplierSupplier
SupplierSupplierSupplierSupplier SupplierSupplier
BuyerBuyer
SupplierSupplierFirst Tier Supplier
Second Tier Supplier
Third Tier Supplier
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JIT Building Blocks: JIT Building Blocks: 6. Preventive Maintenance6. Preventive Maintenance
All activities involved in keeping equipment in working order
Maintaining equipment in good condition and replacing parts that have a tendency to fail before they actually fail
Done to prevent failureJIT requires
Scheduled & daily PMOperator involvement in PM
Knows machinesResponsible for product quality
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Total Productive Maintenance (TPM)Total Productive Maintenance (TPM)
Breakdown maintenanceRepairs to make failed machine operational
Preventive maintenanceSystem of periodic inspection & maintenance
to keep machines operatingTPM combines preventive maintenance & total
quality concepts
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TPM Requires Management to:TPM Requires Management to:
Design products that can be easily produced on existing machines
Design machines for easier operation, changeover, maintenance
Train & retrain workers to operate machines
Purchase machines that maximize productive potential
Design preventive maintenance plan spanning life of machine
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Housekeeping Housekeeping
Housekeeping: Maintaining a workplace that is clean and free of unnecessary materials.
Housekeeping 5 S’s Sort Straighten Sweep Standardize Self-discipline
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ResultsResults
Queue and delay reduction, speedier throughput, freed assets, and winning orders
Quality improvement, reduces waste and wins orders
Cost reduction increases margin or reduces selling price
Variability reductions in the workplace reduces waste and wins orders
Rework reduction, reduces waste and wins orders
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YieldingYielding
Faster response to the customer at lower cost and higher quality
A competitive advantage!
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Summary: Summary: Just-In-Time ProductionJust-In-Time Production
• Management philosophy• “Pull” system though the plant
WHAT IT IS
• Employee participation• Industrial engineering/basics• Continuing improvement• Total quality control• Small lot sizes
WHAT IT REQUIRES
• Attacks waste• Exposes problems and bottlenecks• Achieves streamlined production
WHAT IT DOES
• Stable environment
WHAT IT ASSUMES
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Comparison of JIT and TraditionalComparison of JIT and Traditional Systems Systems
Factor Traditional JIT
Inventory Much to offset forecast errors, late deliveries
Minimal necessary to operate
Deliveries Few, large Many, small
Lot sizes Large Small
Setup; runs Few, long runs Many, short runs
Vendors Long-term relationships are unusual
Partners
Workers Necessary to do the work
Assets
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Transitioning to a JIT SystemTransitioning to a JIT SystemGet top management commitment
Decide which parts need most effort
Obtain support of workers
Start by trying to reduce setup times
Gradually convert operations
Convert suppliers to JIT
Prepare for obstacles
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Obstacles to ConversionObstacles to Conversion
Management may not be committed
Workers/management may not be cooperative
May be difficult to change company culture
Suppliers may resist
Why?
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Suppliers May Resist JITSuppliers May Resist JIT
Unwilling to commit resourcesUneasy about long-term commitmentsFrequent, small deliveries may be difficultBurden of quality control shifts to supplierFrequent engineering changes may cause JIT
changes
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Benefits of JITBenefits of JIT
1. Reduced inventory2. Improved quality3. Lower costs4. Reduced space
requirements5. Reduced lead times6. Increased
productivity7. Greater flexibility8. Reduced scrap and
rework
8. Better relations with suppliers
9. Simplified scheduling and control activities
10. Increased capacity11. Increased equipment
utilization12. Better use of human
resources13. More product variety14. Reduced need for
indirect labor
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JIT in ServicesJIT in Services (1 of 3) (1 of 3)
The basic goal of the demand flow technology in the
service organization is to provide optimum response to the
customer with the highest quality service and lowest
possible cost.
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JIT in ServicesJIT in Services (2 of 3) (2 of 3)
All the techniques used in manufacturing are used in services
Level the facility load & eliminate disruptions and unnecessary activities
Reorganize physical configuration
Introduce demand-pull scheduling
Develop supplier networks
Minimize WIP
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JIT in ServicesJIT in Services (3 of 3) (3 of 3) All the techniques used in manufacturing are used in services
Make the system flexibleReduce setup and lead timesEliminate wasteSimplify the processOrganize problem solving groupsUpgrade quality
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JIT II: a supplier representative works right in the company’s plant, making sure there is an appropriate supply on hand.
JIT IIJIT II
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Use JIT to finely tune an operating systemSomewhat different in
USA than JapanJIT is still evolvingJIT isn’t for everyone
JIT ImplementationJIT Implementation
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Smooth flow of work (the ultimate goal)Elimination of wasteContinuous improvementEliminating anything that does not add valueSimple systems that are easy to manageUse of product layouts to minimize moving
materials and partsQuality at the source
Elements of JITElements of JIT (1 of 2) (1 of 2)
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Poka-yoke – fail safe tools and methodsPreventative maintenanceGood housekeepingSet-up time reduction
Cross-trained employees
A pull system
Elements of JIT (Elements of JIT (2 of 22 of 2))
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Attributes of Lean Producers - TheyAttributes of Lean Producers - Theyuse JIT to eliminate virtually all
inventory
build systems to help employees produce a perfect part every time
reduce space requirements
develop close relationships with suppliers
educate suppliers
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Attributes of Lean Producers - TheyAttributes of Lean Producers - They
eliminate all but value-added activities
develop the workforce
make jobs more challenging
reduce the number of job classes and build worker flexibility