Capacity planning basic mrp does not take capacity

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Unformatted text preview: ning. Basic MRP does not take capacity Basic Capacity constraints into account. Rolling Horizons. MRP is treated as a static system with a fixed MRP Rolling horizon of n periods. The choice of n is arbitrary and can affect the horizon the results. Lead Times Dependent on Lot Sizes. In MRP lead times are In Lead assumed fixed, but they clearly depend on the size of the lot required. required. Quality Problems. Defective items can destroy the linking of the Defective Quality levels in an MRP system. levels Data Integrity. Real MRP systems are big (perhaps more than 20 Real Data levels deep) and the integrity of the data can be a serious problem. levels Order Pegging. A single component may be used in multiple end single Order items, and each lot must then be pegged to the appropriate item. items, JIT 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 Small Advantages: 1. Decreases Inventory Costs 2. Improves Efficiency 3. Reveals quality problems Disadvantages: 1. May result in increased worker idle time 2. May result in...
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This document was uploaded on 03/23/2014.

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