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Unformatted text preview: ning. Basic MRP does not take capacity
constraints into account.
Rolling Horizons. MRP is treated as a static system with a fixed
horizon of n periods. The choice of n is arbitrary and can affect the
Lead Times Dependent on Lot Sizes. In MRP lead times are
assumed fixed, but they clearly depend on the size of the lot
Quality Problems. Defective items can destroy the linking of the
levels in an MRP system.
Data Integrity. Real MRP systems are big (perhaps more than 20
levels deep) and the integrity of the data can be a serious problem.
Order Pegging. A single component may be used in multiple end
items, and each lot must then be pegged to the appropriate item.
JIT (Just In Time) is an outgrowth of the Kanban system
developed by Toyota.
Kanban refers to the posting board where the evolution
of the manufacturing process would be recorded.
The Kanban system is a manual information system that
relies on various types of cards.
It’s development is closely tied to the development of
SMED: Single Minute Exchange of Dies, that allowed
model changeovers to take place in minutes rather than
hours. 12 Kanban
Kanban System for
Two Production Centers
Two Features of JIT Systems
Small Work-in-Process Inventories
1. Decreases Inventory Costs
2. Improves Efficiency
3. Reveals quality problems
1. May result in increased worker idle time
2. May result in...
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This document was uploaded on 03/23/2014.
- Spring '14