1 / 75

Overview

Overview. Dependent demand Master production schedule Bill of materials MRP Time-phased product structure Gross material requirements plan Net requirements plan Lot-sizing techniques Extensions of MRP. Furniture Mfg. Produces 3-types of chairs Ladder-back chair Kitchen chair

liuz
Download Presentation

Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Overview • Dependent demand • Master production schedule • Bill of materials • MRP • Time-phased product structure • Gross material requirements plan • Net requirements plan • Lot-sizing techniques • Extensions of MRP

  2. Furniture Mfg. • Produces 3-types of chairs • Ladder-back chair • Kitchen chair • Desk chair

  3. Master Production Schedule April May 1 2 3 4 5 6 7 8 Ladder-back chair 150 150 Kitchen chair 120 120 Desk chair 200 200 200 200 Aggregate production plan 670 670 for chair family

  4. Bill of Materials • List of components & quantities needed to make product • Provides product structure (tree) • Parents: Items above given level • Children: Items below given level

  5. Bill of Materials Back slats Seat cushion Leg supports Seat-frame boards Back legs Front legs A Ladder-back chair

  6. A Ladder-back chair Back slats Seat cushion B (1) Ladder-back subassembly C (1) Seat subassembly D (2) Front legs E (4) Leg supports Leg supports Seat-frame boards F (2) Back legs G (4) Back slats H (1) Seat frame I (1) Seat cushion Back legs Front legs A Ladder-back chair J (4) Seat-frame boards Bill of Materials

  7. Dependent vs. Independent Demand • Demand for chairs • A finished product • Independent • Demand for front legs • A component or subassembly • Depends on the demand for chairs (parent)

  8. Dependent vs. Independent Demand Materials With Materials With Independent Demand Dependent Demand Demand Company Customers Parent Items Source Material Finished Goods WIP & Raw Materials Type Method of Forecast & Booked Calculated Estimating Customer Orders Demand Planning EOQ & POQ MRP Method

  9. Requirements for Effective Use of Dependent Demand Inventory Models • master production schedule • specifications or bills-of-material • inventory availability • purchase orders outstanding • lead times

  10. Cooperstown Cars, Inc. • Produces toy cars • Body • Axles (2) • Wheels (4)

  11. Cooperstown Cars, Inc. - Each component has a known lead time

  12. Cooperstown Cars, Inc. • Demand for Toy Car in Week 8 is 100 • Schedule production for: • Toy car assembly • Wheel assembly • Body • Axle • Wheels

  13. Time-Phased Product Structure

  14. Time-Phased Product Structure

  15. Time-Phased Product Structure

  16. Time-Phased Product Structure

  17. Time-Phased Product Structure

  18. Time-Phased Product Structure

  19. More complexity/Scheduled receipts

  20. More complexity/Scheduled receipts

  21. More complexity/Scheduled receipts Explanation: Gross requirements are the total demand for wheels. Projected on-hand inventory in week 1 is 30 + 200 – 150

  22. Scheduled or planned receipts in week t Projected on-hand inventory balance at end of week t Inventory on hand at end of week t - 1 Gross requirements in week t = + – More complexity/Scheduled receipts

  23. More complexity/Scheduled receipts

  24. Lot-Sizing Rules • When there is a net requirement, how much should we order? • Lot-for-lot – L4L • Economic Order Quantity – EOQ • Part Period Balancing - PPB • Wagner-Whitin Algorithm

  25. Lot-Sizing Rules: L4L L4L- order the amount needed to fulfill requirements

  26. Lot-Sizing Rules: L4L

More Related