Operations Management (Comp. Instructor's Edition)
13th Edition
ISBN: 9781259948237
Author: Stevenson
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 6, Problem 5P
As part of a major plant renovation project, the industrial engineering department has been asked to balance a revised assembly operation to achieve an output of 240 units per eight-hour day. Task times and precedence relationships are as follows:
Do each of the following:
a. Draw the precedence diagram.
b. Determine the minimum cycle time, the maximum cycle time, and the calculated cycle time.
c. Determine the minimum number of stations needed.
d. Assign tasks to workstations on the basis of most following tasks. Use shortest processing time as a tiebreaker. If ties still exist, assume indifference in choice.
e. Compute the percentage of idle time for the assignment in part d.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The Action Toy Company has decided to manufacture a new
train set, the production of which is broken into six steps.
The demand for the train is 4,800 units per 40-
hourworkweek: a) Draw a precedence diagram of this
operation. b) Given the demand, what is the cycle time for
this operation? c) What is the theoretical minimum number
of workstations? d) Assign tasks to workstations. e) How
much total idle time is present each cycle? f) What is the
efficiency of the assembly line with five stations? With six
stations?
TASK
PERFORMANCE TIME (sec)
PREDECESSORS
A
20
None
30
15
15
A
E
10
В. С
30
D, E
The City Commission of Nashville has decided to build a botanical garden and picnic area in the heart of the city for the recreation of its
citizens. The precedence table for all the activities required to construct this area successfully is as follows:
Code
A
B
с
D
E
F
G
H
I
Description
Find location; determine resource requirements
Requisition of lumber and sand
Dig and grade
Saw lumber into appropriate sizes
Position lumber in correct locations
Time
(hrs)
20
60
100
30
20
10
20
10
30
Nail lumber together
Put sand in and under the equipment
Put dirt around the equipment
Put grass all over the garden, landscape, paint
Refer to the legend for the activity that corresponds to each code.
Using the line drawing tool, draw a Gantt chart for activites E through I of the project.
Immediate Predecessor(s)
None
A
A
B
D, C
E
F
F
G, H
A
B
C-
D-
E
F
G
H-
H
0
20 40
60
80 100 120 140 160 180 200
Q
✔
A company is setting up an assembly line to produce 90 units per hour. The table below identifies the work elements, times, and immediate predecessors.
Work Element
Time (Sec.)
Immediate Predecessor(s)
A
25
-
B
18
A
C
20
A
D
5
B, C
E
12
C
F
8
E
G
16
D, F
H
12
G
What cycle time is required to satisfy the required output?
What is the theoretical minimum number of stations?
Chapter 6 Solutions
Operations Management (Comp. Instructor's Edition)
Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.2 - MORTON SALT Introduction Morton Salt is a...Ch. 6.3 - FOXCONN SHIFTS ITS FOCUS TO AUTOMATION Foxconn...Ch. 6.3 - FOXCONN SHIFTS ITS FOCUS TO AUTOMATION Foxconn...Ch. 6.3 - Prob. 2.1RQCh. 6.3 - Prob. 2.2RQ
Ch. 6.5 - Prob. 1.1RQCh. 6.5 - Prob. 1.2RQCh. 6 - Explain the importance of process selection in...Ch. 6 - Briefly describe the five process types, and...Ch. 6 - Prob. 3DRQCh. 6 - Briefly describe computer-assisted approaches to...Ch. 6 - What is a flexible manufacturing system, and under...Ch. 6 - Prob. 6DRQCh. 6 - Why might the choice of equipment that provides...Ch. 6 - Prob. 8DRQCh. 6 - Prob. 9DRQCh. 6 - Briefly describe the two main layout types.Ch. 6 - Prob. 11DRQCh. 6 - Prob. 12DRQCh. 6 - What is the goal of Line balancing? What happens...Ch. 6 - Why are routing and scheduling continual problems...Ch. 6 - Prob. 15DRQCh. 6 - Prob. 16DRQCh. 6 - The City Transportation Planning Committee must...Ch. 6 - Identify the fixed-path and variable-path...Ch. 6 - Prob. 19DRQCh. 6 - Prob. 20DRQCh. 6 - Prob. 21DRQCh. 6 - Prob. 22DRQCh. 6 - What is cellular manufacturing? What are its main...Ch. 6 - Prob. 24DRQCh. 6 - Prob. 25DRQCh. 6 - Prob. 1TSCh. 6 - What trade-offs are involved when deciding how...Ch. 6 - Who needs to be involved in process selection?Ch. 6 - Prob. 4TSCh. 6 - Prob. 5TSCh. 6 - Prob. 1CTECh. 6 - Prob. 2CTECh. 6 - What are the risks of automating a production...Ch. 6 - Consider an assembly line such as the burrito...Ch. 6 - Prob. 1PCh. 6 - A manager wants to assign tasks to workstations as...Ch. 6 - A manager wants to assign tasks to workstations as...Ch. 6 - A producer of inkjet printer is planning to add a...Ch. 6 - As part of a major plant renovation project, the...Ch. 6 - Twelve tasks, with times and precedence...Ch. 6 - For the given set of tasks, do the following: a....Ch. 6 - A shop works a 400-minute day. The manager of the...Ch. 6 - Arrange six departments into a 2 3 grid so that...Ch. 6 - Using the information given in the preceding...Ch. 6 - Using the information in the following grid,...Ch. 6 - Arrange the eight departments shown in the...Ch. 6 - Arrange the departments so they satisfy the...Ch. 6 - a. Determine the placement of departments fix a...Ch. 6 - Prob. 15PCh. 6 - Develop a process layout that will minimize the...Ch. 6 - Prob. 17PCh. 6 - Rebalance the assembly line in Problem 7. This...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- An assembly line is to operate eight hours per day with a desired output of 200 units per day. The following table contains information on this product’s task times and precedence relationships: TASK TASK TIME(SECONDS) IMMEDIATEPREDECESSOR A 60 — B 60 A C 50 A D 70 A E 30 B, C F 110 C, D G 70 E, F H 70 G b. What is the required workstation cycle time to meet the desired output rate? (Round your answer to the nearest whole number.) c. Balance this line using the longest task time. (Leave no cells blank - be certain to enter "0" wherever required.) d. What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b? (Round your answer to 1 decimal place.)arrow_forwarda. Draw the precedence diagram for the processesb. Design a process layout with minimum number of workstations that would achieve thedaily production target without violating the precedence constraints c. Is it possible to issue a card per applicant every 5 minutes and why? d. How efficient is your line? e. Determine the balance delayarrow_forwardA manufacturing company is designing an assembly lineto produce its main product. Th e line should be able to produce60 units per hour. Th e following data in Table 10-16 give thenecessary information. (a) Which task is the bottleneck?(b) Draw a precedence diagram for the above information.(c) Compute the cycle time with a desired output of 60 unitsper hourarrow_forward
- A manager wants to assign tasks to workstations as efficiently as possible and achieve an hourly output of 331/3 units. Assume the shop works a 60-minute hour. Assign the tasks shown in the accompanying precedence diagram (times are in minutes) to workstations using the following rules: A. In order of most following tasks. Tiebreaker: greatest positional weight. Work Station Task I II III IV b. In order of greatest positional weight. Tiebreaker: most following tasks. Work Station Tasks I II III IV c. What is the efficiency? (Round your answer to 2 decimal places.) Efficiency _________%arrow_forwardThe desired daily output for an assembly line is 360 units. This assembly line will operate 690 minutes per day. The following table contains information on this product's task times and precedence relationships: TASK TIME IMMEDIATE TASK (SECONDS) PREDECESSOR 30 55 A 50 A 55 E 35 100 G 60 E-F 45 D-G b. What is the required workstation cycle time to meet the desired output rate? Workstation cycle time seconds per unitarrow_forwardAn assembly line must be designed to produce 40 containers per hour. The following data give the necessary information Table 1 TASK IMMEDIATE PREDECESSOR TASK TIME (sec) A None 60 B A 12 C B 35 D A 55 E D 10 F E 50 G F, C 5 Draw the precedence diagram. Compute the cycle time (in seconds) to achieve the desired output rate. What is the theoretical minimum number of stations? Assign the tasks to the workstation? What is the efficiency of the line? Calculate the idle timearrow_forward
- Francis Johnson’s plant needs to design an efficient assembly line to make a new product. The assembly line needs to produce 15 units per hour, and there is room for only four workstations. The tasks and the order in which they must be performed are shown in the following table. Tasks cannot be split, and it would be too expensive to duplicate any task. TASK TASK TIME (MINUTES) IMMEDIATE PREDECESSOR A 1 — B 2 — C 3 — D 1 A, B, C E 3 C F 2 E G 3 E What is the workstation cycle time required to produce 15 units per hour? Note: Round your answer to 1 decimal place. Balance the line to use the fewest possible workstations to meet the cycle time found in part (b). Use whatever method you feel is appropriate. What is the efficiency of your line balance, assuming the line operates at the cycle time from part (b)? Note: Round your answer to 1 decimal place.arrow_forwardGiven the following task, times, and sequence, develop a balanced line capable of operating with a I 0-minute cycle time at Dave Visser's company. a) Draw the precedence diagram.b) Assign tasks to the minimum feasible number of workstations according to the greatest time remaining (ranked positional weight) decision rule.c) What is the efficiency of the process?arrow_forwardA small assembly line for the assembly of power steering pumps needs to be balanced. Precedence diagram is shown below. The cycle time is determined to be 1.7 minutes. How would the line be balanced by choosing the assignable task having the longest task time first? Fill in the table below. If your answer is zero, enter "0". Round your answers to one decimal place. Station Tasks Total Time Idle Time 1 B,A,C,D 2 E,F 3 G,H,I Total What is the assembly-line efficiency? Round your answer to one decimal place. %arrow_forward
- A DIY product manufacturing company wishes to create a ‘product’ focused layout for the manufacture of their new cordless drill. There order book requires them to produce 480 drills per eight hour day. The assembly operations for the drill and the associated information are given in the table below. Therefore the key tasks are to: Management has decided to cut down 3 seconds from each operation (operation 1 - 8) to improve overall effectiveness. (a) calculate the maximum cycle time (b) calculate the minimum number of work stations (c) produce the precedence diagram (d) produce the line design which achieves the required cycle time (e) calculate balancing lossarrow_forwardThe Henry Street Mission uses volunteers to assemble carepackages for needy families during the holiday season. Themission would like to organize the work as efficiently as possible. A list of tasks, task times, and precedence re-quirements follows: a. If the mission wants to complete a care package every10 minutes, how many volunteers should be called in?Balance the line and calculate the efficiency. How manypackages can be assembled in a four-hour period?b. Suppose that volunteers are plentiful. Balance the lineto maximize output. What is the efficiency of the line? How many care packages can be assembled in a four-hour period?arrow_forwardThe following is a list of activities that must be completed in order to assemble a car. Draw the precedence diagram. Calculate the cycle time if there5 are 8 hours in a workday and 800 units desired per day. Balance the line using the longest operation time as a selection rule. Calculate the efficiency rating. How much overtime would be needed for an additional 20 units? Is this possible? Task Time Feasible TASK TIME PRECEDING Station Task Time Remaining Tasks TASK (Seconds) TASK A 16 ----- B 14 ----- C 22 ----- D…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
Operations ManagementOperations ManagementISBN:9781259667473Author:William J StevensonPublisher:McGraw-Hill Education
Operations and Supply Chain Management (Mcgraw-hi...Operations ManagementISBN:9781259666100Author:F. Robert Jacobs, Richard B ChasePublisher:McGraw-Hill Education
Purchasing and Supply Chain ManagementOperations ManagementISBN:9781285869681Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. PattersonPublisher:Cengage Learning
Production and Operations Analysis, Seventh Editi...Operations ManagementISBN:9781478623069Author:Steven Nahmias, Tava Lennon OlsenPublisher:Waveland Press, Inc.
Practical Management Science
Operations Management
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:Cengage,
Operations Management
Operations Management
ISBN:9781259667473
Author:William J Stevenson
Publisher:McGraw-Hill Education
Operations and Supply Chain Management (Mcgraw-hi...
Operations Management
ISBN:9781259666100
Author:F. Robert Jacobs, Richard B Chase
Publisher:McGraw-Hill Education
Purchasing and Supply Chain Management
Operations Management
ISBN:9781285869681
Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
Publisher:Cengage Learning
Production and Operations Analysis, Seventh Editi...
Operations Management
ISBN:9781478623069
Author:Steven Nahmias, Tava Lennon Olsen
Publisher:Waveland Press, Inc.
Inventory Management | Concepts, Examples and Solved Problems; Author: Dr. Bharatendra Rai;https://www.youtube.com/watch?v=2n9NLZTIlz8;License: Standard YouTube License, CC-BY