Just In Time Production (JIT)
The Just In Time production concept was first implemented in Japan
around 1970's to eliminate waste of
Materials
Capital
Manpower
Inventory
Through out manufacturing system.
The JIT concept has the following objectives
Receives raw materials just in time to be used.
Produce part just in time to be used in subassemblies.
Produce subassemblies just in time to be assembled into finished
products.
Produce and deliver finished products just in time to be sold.
In order to achieve these objectives, every point in the organization,
where buffer stocks normally occur are identified. Then critical examination of
the reason for such stocks are made.
A set of possible reasons for maintaining high stock is listed below.
Unreliable/unpredicted deliveries.
Poor qualities from suppliers.
Increased varieties of materials.
Machine break down.
Labour obsentism.
Frequent machine setting.
Variation in operators capabilities.
Schedule changes.
Changing product modification.
In traditional manufacturing, the parts are made in batches, placed in
the stock of finished product and used whenever necessary. This approach is
known as "push system". Which means that parts are made according to
schedule and are kept in inventory to be used as and when they are needed.
In contrast, Just In Time is a "pull system" which means that parts are
produced in accordance with the order. It means the rate at which the
products come out at the end of final assembly matches with the order
quantity for that product. There no stock piles within the production process.
This is also called zero inventory, stockless production, demand scheduling.
Moreover, parts are inspected by the workers as they are manufactured. And
this process of inspection takes a very short period. As a result of which
workers can maintain continuous production control immediately identifying
defective parts and reducing process variation. Therefore, the JIT system
ensures quality products. Extra work involved in stockpiling parts are
eliminated.
The Just In Time production concept was first implemented in Japan
around 1970's to eliminate waste of
Materials
Capital
Manpower
Inventory
Through out manufacturing system.
The JIT concept has the following objectives
Receives raw materials just in time to be used.
Produce part just in time to be used in subassemblies.
Produce subassemblies just in time to be assembled into finished
products.
Produce and deliver finished products just in time to be sold.
In order to achieve these objectives, every point in the organization,
where buffer stocks normally occur are identified. Then critical examination of
the reason for such stocks are made.
A set of possible reasons for maintaining high stock is listed below.
Unreliable/unpredicted deliveries.
Poor qualities from suppliers.
Increased varieties of materials.
Machine break down.
Labour obsentism.
Frequent machine setting.
Variation in operators capabilities.
Schedule changes.
Changing product modification.
In traditional manufacturing, the parts are made in batches, placed in
the stock of finished product and used whenever necessary. This approach is
known as "push system". Which means that parts are made according to
schedule and are kept in inventory to be used as and when they are needed.
In contrast, Just In Time is a "pull system" which means that parts are
produced in accordance with the order. It means the rate at which the
products come out at the end of final assembly matches with the order
quantity for that product. There no stock piles within the production process.
This is also called zero inventory, stockless production, demand scheduling.
Moreover, parts are inspected by the workers as they are manufactured. And
this process of inspection takes a very short period. As a result of which
workers can maintain continuous production control immediately identifying
defective parts and reducing process variation. Therefore, the JIT system
ensures quality products. Extra work involved in stockpiling parts are
eliminated.
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