What is JIT?What is JIT?
A corporate system designed to produceA corporate system designed to produce
output within the minimum lead time and atoutput within the minimum lead time and at
the lowest total cost by continuouslythe lowest total cost by continuously
identifying and eliminating all forms ofidentifying and eliminating all forms of
corporate waste.corporate waste.
It is used to describe stockless productionIt is used to describe stockless production
manufacturing approach, where only rightmanufacturing approach, where only right
parts are completed at right time.parts are completed at right time.
Focus of JIT:Focus of JIT:
•• Stockless production.Stockless production.
Seven Basic Types of WasteSeven Basic Types of Waste
Transportation wasteTransportation waste
Process WasteProcess Waste
Inventory WasteInventory Waste
Waste of motionWaste of motion
Waste from product defectsWaste from product defects
Waiting timeWaiting time
Push versus PullPush versus Pull
PushPush system: material issystem: material is pushedpushed intointo
downstream workstations regardless ofdownstream workstations regardless of
whether resources are availablewhether resources are available
PullPull system: material issystem: material is pulledpulled to ato a
workstation just as it is neededworkstation just as it is needed
JIT is a pull system.JIT is a pull system.
Material is pulled through the system whenMaterial is pulled through the system when
Reversal of traditional push system whereReversal of traditional push system where
material is pushed according to a schedulematerial is pushed according to a schedule
Forces cooperationForces cooperation
Prevent over and underproductionPrevent over and underproduction
While push systems rely on a predetermined
schedule, pull systems rely on customer
Part is produced on the authorization referred to
as a KANBAN is issued from the next
What is kanban?What is kanban?
Developed at Toyota 1950s to manage lineDeveloped at Toyota 1950s to manage line
material flows.material flows.
Kanban ( Kan=card, Ban= signal )Kanban ( Kan=card, Ban= signal )
simple movement systemsimple movement system
Boxes/containers to take “lots” of parts from one workBoxes/containers to take “lots” of parts from one work
station to another (client-server).station to another (client-server).
““Cards” to signal & communicate reorder informationCards” to signal & communicate reorder information
What is kanban?What is kanban?
Server only delivers components to client work station asServer only delivers components to client work station as
& when needed (called/pulled).& when needed (called/pulled).
Minimise storage in the production area.Minimise storage in the production area.
Workstations only produce/deliver components whenWorkstations only produce/deliver components when
called (they receive card + empty container).called (they receive card + empty container).
The work-station produces enough to fill the containerThe work-station produces enough to fill the container
Kanban = an authorization to produce more inventoryKanban = an authorization to produce more inventory
We thus limit the amount of inventory in process.We thus limit the amount of inventory in process.
BENEFITS OF JITBENEFITS OF JIT
Reduced inventoryReduced inventory
Reduced working progressReduced working progress
Improved qualityImproved quality
Reduced direct laborReduced direct labor
Reduced floor spaceReduced floor space
Minimum tool repair costMinimum tool repair cost
Reduced material handling and increaseReduced material handling and increase
in overall through put.in overall through put.
JIT RELATION TO FMSJIT RELATION TO FMS
JIT can be either a cause or an effect ofJIT can be either a cause or an effect of
Achievement of true results of F.M.SAchievement of true results of F.M.S
without implementing JIT is difficult.without implementing JIT is difficult.
Results due to incorporation of JIT inResults due to incorporation of JIT in
F.M.S are decreased lead times, less workF.M.S are decreased lead times, less work
in process on shop floor, smaller finishedin process on shop floor, smaller finished
part inventory and increased customerpart inventory and increased customer