PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB
PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB
11th Edition
ISBN: 9780135226742
Author: HEIZER
Publisher: PEARSON
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Chapter 14, Problem 13P

a)

Summary Introduction

To construct: A product structure.

Introduction:

Product structure:

The product structure is a visual representation of the components needed for a product assembly and the sequence at which they must be developed. It will clearly depict the parents and children components at each level.

a)

Expert Solution
Check Mark

Answer to Problem 13P

Product structure:

PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB, Chapter 14, Problem 13P , additional homework tip  1

Explanation of Solution

Given information:

  • 1000 20” fans due in week 7.
  • Each fan is made of a housing assembly, two grills, fan assembly and an electrical unit.
  • Housing assembly is made of frame, two supports, and a handle.
  • Fan assembly is made up of a hub and five blades.
  • Electrical unit consists of a motor, switch and a knob.
Component Lead time On-hand inventory Lot size Scheduled receipt
20" Fan 1 100
Housing 1 100
Frame 2
Supports (2) 1 50 100
Handle 1 400 500
Grills (2) 2 200 500
Fan assembly 3 150
Hub 1
Blades (5) 2 100
Electrical unit 1
Motor 1
Switch 1 20 12
Knob 1 25 200 in week 2

Product structure:

PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB, Chapter 14, Problem 13P , additional homework tip  2

The product is a 20” fan. It is made of four components. Each fan is made of a housing assembly, two grills, fan assembly and an electrical unit. Housing assembly is made of frame, two supports, and a handle. Fan assembly is made up of a hub and five blades. Electrical unit consists of a motor, switch and a knob.

b)

Summary Introduction

To construct: A time-phased product structure.

Introduction:

Time-phased product structure:

The time-phased product structure will represent the product visually with the details of when each component must begin production. It should be done to ensure that all the components are on time.

b)

Expert Solution
Check Mark

Answer to Problem 13P

Time-phased product structure:

PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB, Chapter 14, Problem 13P , additional homework tip  3

Explanation of Solution

Given information:

  • 1000 20” fans due in week 7.
  • Each fan is made of a housing assembly, two grills, fan assembly and an electrical unit.
  • Housing assembly is made of frame, two supports, and a handle.
  • Fan assembly is made up of a hub and five blades.
  • Electrical unit consists of a motor, switch and a knob.
Component Lead time On-hand inventory Lot size Scheduled receipt
20" Fan 1 100
Housing 1 100
Frame 2
Supports (2) 1 50 100
Handle 1 400 500
Grills (2) 2 200 500
Fan assembly 3 150
Hub 1
Blades (5) 2 100
Electrical unit 1
Motor 1
Switch 1 20 12
Knob 1 25 200 in week 2

Time-phased product structure:

PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB, Chapter 14, Problem 13P , additional homework tip  4

The end product is the fan which must be ready at week 7. All the other components must be completed on week 6. The components at the lower level must be completed first before proceeding to the higher levels. Each component at each level is begun depending on the lead time of the product.

The products are started in advance so that they are developed and ready on time so that the dependent parent will be ready to develop its product. The process is repeated until all the subassemblies are ready to make the final product.

c)

Summary Introduction

To develop: A net requirements plan.

Introduction:

Net requirements plan:

The net requirements plan is the plan which is established on the gross requirements plan formed by deducting the stock on and the scheduled receipts. If the total requirement is below the safety stock levels, a planned order is made based on the given lot sizing technique.

c)

Expert Solution
Check Mark

Explanation of Solution

Given information:

  • 1000 20” fans due in week 7.
  • Each fan is made of a housing assembly, two grills, fan assembly and an electrical unit.
  • Housing assembly is made of frame, two supports, and a handle.
  • Fan assembly is made up of a hub and five blades.
  • Electrical unit consists of a motor, switch and a knob.
Component Lead time On-hand inventory Lot size Scheduled receipt
20" Fan 1 100
Housing 1 100
Frame 2
Supports (2) 1 50 100
Handle 1 400 500
Grills (2) 2 200 500
Fan assembly 3 150
Hub 1
Blades (5) 2 100
Electrical unit 1
Motor 1
Switch 1 20 12
Knob 1 25 200 in week 2

Net requirements plan:

20’’ Fan:

Week
20" Fan 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 1,000
Scheduled  receipt
On hand (100) 100
Net requirement 900
Planned order receipt 900
Planned order release 900

Week 7:

The gross requirement is 1,000 (1 assembly). The on hand inventory is 100. Hence, the net requirement is 900. The lead time is 1 week. Therefore, the planned order release will be 900 in week 6 which will be the planned order receipt in week 7.

Housing:

Week
Housing 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt
On hand (100) 100
Net requirement 800
Planned order receipt 800
Planned order release 800

Week 6:

The gross requirement is 900 (1 assembly) derived from the planned order release of 20” fan. The on hand inventory is 100. Hence, the net requirement is 800. The lead time is 1 week. Therefore, the planned order release will be 800 in week 5 which will be the planned order receipt in week 6.

Grills:

Week
Grills 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 1,800
Scheduled  receipt
On hand (200) 200 400
Net requirement 1,600
Planned order receipt 2,000
Planned order release 2,000

Week 6:

The gross requirement is 1,800 (2 assembly) derived from the planned order release of 20” fan. The on hand inventory is 200. Hence, the net requirement is 1,600. The lead time is 2 weeks. Therefore, the planned order release will be 2,000 (Lot Size = 500) in week 4 which will be the planned order receipt in week 6. The excess inventory will be available at week 7.

Fan assembly:

Week
Fan assembly 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt
On hand (150) 150
Net requirement 750
Planned order receipt 750
Planned order release 750

Week 6:

The gross requirement is 900 (1 assembly) derived from the planned order release of 20” fan. The on hand inventory is 150. Hence, the net requirement is 750. The lead time is 2 weeks. Therefore, the planned order release will be 750 in week 4 which will be the planned order receipt in week 6.

Electrical unit:

Electrical Unit 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt
On hand (0) 0
Net requirement 900
Planned order receipt 900
Planned order release 900

Week 6:

The gross requirement is 900 (1 assembly) derived from the planned order release of 20” fan. The on hand inventory is 0. Hence, the net requirement is 900. The lead time is 1 week. Therefore, the planned order release will be 900 in week 5 which will be the planned order receipt in week 6.

Frame:

Frame 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 800
Scheduled  receipt
On hand (0) 0
Net requirement 800
Planned order receipt 800
Planned order release 800

Week 5:

The gross requirement is 800 (1 assembly) derived from the planned order release of Housing. The on hand inventory is 0. Hence, the net requirement is 800. The lead time is 2 weeks. Therefore, the planned order release will be 800 in week 3 which will be the planned order receipt in week 5.

Supports:

Week
Supports 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 1,600
Scheduled  receipt
On hand (50) 50
Net requirement 1,550
Planned order receipt 1,600
Planned order release 1,600

Week 5:

The gross requirement is 1,600 (2 assembly) derived from the planned order release of Housing. The on hand inventory is 50. Hence, the net requirement is 1,550. The lead time is 1 week. Therefore, the planned order release will be 1,600 (Lot size = 100) in week 4 which will be the planned order receipt in week 5. The excess inventory is available at week 6.

Handle:

Week
Handle 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 800
Scheduled  receipt
On hand (400) 400 100
Net requirement 400
Planned order receipt 500
Planned order release 500

Week 5:

The gross requirement is 800 (1 assembly) derived from the planned order release of Housing. The on hand inventory is 400. Hence, the net requirement is 400. The lead time is 1 week. Therefore, the planned order release will be 500 (Lot size = 500) in week 4 which will be the planned order receipt in week 5. The excess inventory is available at week 6.

Hub:

Week
Hub 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 750
Scheduled  receipt
On hand (0) 0
Net requirement 750
Planned order receipt 750
Planned order release 750

Week 3:

The gross requirement is 750 (1 assembly) derived from the planned order release of fan assembly. The on hand inventory is 0. Hence, the net requirement is 750. The lead time is 1 week. Therefore, the planned order release will be 750 in week 2 which will be the planned order receipt in week 3.

Blades:

Week
Blades 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 3,750
Scheduled  receipt
On hand (0) 0 50
Net requirement 3,750
Planned order receipt 3,800
Planned order release 3,800

Week 3:

The gross requirement is 3,750 (5 assembly) derived from the planned order release of fan assembly. The on hand inventory is 0. Hence, the net requirement is 3,750. The lead time is 2 weeks. Therefore, the planned order release will be 3,800 (Lot size = 100) in week 1 which will be the planned order receipt in week 3. The excess inventory will be available at week 4.

Motor:

Week
Motor 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt
On hand (0) 0
Net requirement 900
Planned order receipt 900
Planned order release 900

Week 5:

The gross requirement is 900 (1 assembly) derived from the planned order release of Electrical unit. The on hand inventory is 0. Hence, the net requirement is 900. The lead time is 1 week. Therefore, the planned order release will be 900 in week 4 which will be the planned order receipt in week 5.

Switch:

Week
Switch 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt
On hand (20) 20 8
Net requirement 880
Planned order receipt 888
Planned order release 888

Week 5:

The gross requirement is 900 (1 assembly) derived from the planned order release of Electrical unit. The on hand inventory is 20. Hence, the net requirement is 880. The lead time is 1 week. Therefore, the planned order release will be 888 (Lot Size = 12) in week 4 which will be the planned order receipt in week 5. The excess inventory will be available at week 6.

Knob:

Week
Knob 1 2 3 4 5 6 7 8 9 10 11 12
Gross requirements 900
Scheduled  receipt 200
On hand (0) 200 200 200
Net requirement 700
Planned order receipt 700
Planned order release 700

Week 2:

There is a scheduled receipt of 200 which can be used as inventory.

Week 5:

The gross requirement is 900 (1 assembly) derived from the planned order release of Electrical unit. The on hand inventory is 0. But, there is a scheduled receipt of 200. Hence, the net requirement is 7000. The lead time is 1 week. Therefore, the planned order release will be 700 in week 4 which will be the planned order receipt in week 5.

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Chapter 14 Solutions

PRIN.OF OPERATIONS MANAGEMENT-MYOMLAB

Ch. 14 - What functions of the firm affect an MRP system?...Ch. 14 - Prob. 11DQCh. 14 - Prob. 12DQCh. 14 - Prob. 13DQCh. 14 - Prob. 14DQCh. 14 - As an approach to inventory management, how does...Ch. 14 - Prob. 16DQCh. 14 - Use the Web or other sources to: a) Find stories...Ch. 14 - Prob. 18DQCh. 14 - Prob. 19DQCh. 14 - You have developed the following simple product...Ch. 14 - You are expected to have the gift bags in Problem...Ch. 14 - Prob. 3PCh. 14 - Your boss at Xiangling Hu Products, Inc., has just...Ch. 14 - The demand for subassembly S is 100 units in week...Ch. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - You are product planner for product A (in Problem...Ch. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Heather Adams, production manager for a Colorado...Ch. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Data Table for Problems 14.22 through 14.25 ...Ch. 14 - Develop a POQ solution and calculate total...Ch. 14 - Using your answers for the lot sizes computed in...Ch. 14 - M. de Koster, of Rene Enterprises, has the master...Ch. 14 - Grace Greenberg, production planner for Science...Ch. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Courtney Kamauf schedules production of a popular...Ch. 14 - Using the data for the coffee table in Problem...Ch. 14 - Prob. 1CSCh. 14 - Prob. 2CSCh. 14 - Prob. 1.1VCCh. 14 - Prob. 1.2VCCh. 14 - Prob. 1.3VCCh. 14 - Prob. 2.1VCCh. 14 - Prob. 2.2VCCh. 14 - Prob. 2.3VC
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