Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 6, Problem 13P
Summary Introduction
Interpretation: Minimum possible cycle time of assembly line is to be discussed.
Concept Introduction: Assemble to order process is a business strategy in which goods are produced immediately and minimum customization is required according to the customer’s need,
Make to stock is a business strategy which
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A company is preparing a bid on a government contract for 40 units of a certain product. The operations manager estimates the assembly time required for the first two units to be 10.4 hours and 8.8 hours, respectively. Approximately how long will it take to produce the last ten units?
Dr. Lori Baker, operations manager at Nesa Electronics, prides herself on excellent assembly line balancing. She has been told that the firm needs to complete 96 instruments per 24-hour day. The assembly-line tasks for the production of the instrument are:
Task
Time (minutes)
Predecessors
A
3
----
B
6
----
C
7
A
D
5
A, B
E
2
B
F
4
C
G
5
F
H
7
D, E
I
1
H
J
6
E
K
4
G, I, J
Draw the precedence diagram
If the daily production (24-hour) production rate is 96 units, what is the highest allowable cycle time?
If the cycle time after allowances is given as 12 minutes, what is the daily (24-hour) production rate?
With a 12-minute cycle time, what is the theoretical minimum number of stations with which the line can be balanced?
Assign task to workstations. Use the following decision rules (heuristics): longest task first, break ties by assigning the task with the most followers.
What are the efficiency and the balance delay of the assembly line?
Show detil of…
An assembly line is to be designed to operate 13 hours per day and supply a steady demand of 325 units per day. Here are the tasks and their performance times:
TASK
PRECEDINGTASKS
PERFORMANCE TIME (SECONDS)
TASK
PRECEDINGTASKS
PERFORMANCETIME (SECONDS)
a
—
48
g
d
43
b
—
58
h
e
38
c
—
73
i
f
23
d
a
63
j
g
33
e
b
88
k
h, i
53
f
c
23
l
j, k
67
A) What is the efficiency of your line balance?
B) Suppose demand increases by 10 percent. How would you react to this? Assume that you can operate only 13 hours per day in regular time. (Round your answers to the nearest whole number.)
Chapter 6 Solutions
Practical Operations Management
Ch. 6 - Prob. 1DQCh. 6 - Prob. 2DQCh. 6 - Prob. 3DQCh. 6 - Prob. 4DQCh. 6 - Prob. 5DQCh. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5P
Ch. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10PCh. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 1.1QCh. 6 - Prob. 1.2QCh. 6 - Prob. 1.3QCh. 6 - Prob. 1.4QCh. 6 - Prob. 2.1QCh. 6 - Prob. 2.2QCh. 6 - Prob. 2.3QCh. 6 - Prob. 3.1QCh. 6 - Prob. 3.2QCh. 6 - Prob. 3.3Q
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- The diagram below represents a process where two components are made at stations A1 and A2 (one component is made at A1 and the other at A2). These components are then assembled at station B and moved through the rest of the process, where some additional work is completed at stations C, D, and E. Assume that one and only one person is allowed at each station. Assume that the times given below for each station represent the amount of work that needs to be done at that station by that person, with no processing time variation. Assume that inventory is not allowed to build in the system. A1 0.30 min. B 0.75 min. 0.65 min. 0.90 min. 0.55 min. A2 0.40 min. What is the average hourly output of the process when it is in normal operation? (Round your answer to the nearest whole number.) Average hourly output unitsarrow_forwardAtlas Inc. is a toy bicycle manufacturing company producing a five-inch smallversion of the bike that Lance Armstrong rode to win his first Tour de France. The assembly lineat Atlas Inc. consists of seven work stations, each performing a single step. Stations andprocessing times are summarized here: Step 1 (30 sec.): The plastic tube for the frame is cut to size. Step 2 (20 sec.): The tube is put together. Step 3 (35 sec.): The frame is glued together Step 4 (25 sec.): The frame is cleaned. Step 5 (30 sec.): Paint is sprayed onto the frame. Step 6 (45 sec.): Wheels are assembled. Step 7 (40 sec.): All other parts are assembled to the frame.Under the current process layout, workers are allocated to the stations as shown here: Worker 1: Steps 1, 2 Worker 2: Steps 3, 4 Worker 3: Step 5 Worker 4: Step 6 Worker 5: Step 7a. What is the bottleneck in this process?b. What is the capacity of this assembly line, in finished units/hour?c. What is the utilization of Worker 4, ignoring…arrow_forwardThe following diagram represents a process where two components are made at stations A1 and A2 (one component is made at A1 and the other at A2). These components are then assembled at station B and moved through the rest of the process, where some additional work is completed at stations C, D, and E. Assume that one and only one person is allowed at each station. Assume that the times given for each station represent the amount of work that needs to be done at that station by that person, with no processing time variation. Assume that inventory is not allowed to build in the system. What is the average hourly output of the process when it is in normal operation?arrow_forward
- The maker of the world-famous Chocolate Chip Cookies needs to design a product layout for a new product, Mint Chocolate Chip. The company plans to use this new production line eight hours a day in order to meet projected demand of 1,440 cases per day. The following table describes the tasks involved in the production of a case of Mint Chocolate Chip Cookies. 27 seconds 0.3333 seconds 18 seconds 14 seconds 56 seconds 20 secondsarrow_forwardA firm uses a serial assembly system and needs answers to the following: An output of 900 units per shift (7.5 hours) is desired for a new processing system. The system requires product to pass through four stations where the work content at each station is 30 seconds. What is the required cycle time for such a system?arrow_forwardThere are six wires which need to be attached to a circuit board. A robotic device will attach the wires. The wires can be attached in any order, and the production manager wishes to determine which order would be fastest for the robot to use. Use the multiplication rule of counting to determine the number of possible sequences of assembly that must be tested. (Hint: There are six choices for the first wire, five for the second wire, four for the third wire, etc.)arrow_forward
- A production line is to be designed to make 500 El-More dolls per day. Each doll requires 11 activities totaling 16 minutes of work. The factory operates 750 minutes per day. What is the required cycle time for this assembly line?arrow_forwardConsider the following two production processes making an electronic component for a navigation system. Both processes consist of 20 stations and operate at a cycletime of 1 minute/unit. Their most error-prone operation is step 9:• Process 1 has a final inspection at the end of the process and has about 300 units of inventory between step 9 and the inspection.• Process 2 has each worker check the work of the previous steps and about 50 units ofinventory between step 9 and the end of the process, roughly equally distributed across theremainder of the process.What would be the information turnaround time for a defect made at station 9?arrow_forwardAn assembly line with 17 tasks is to be balanced. The longest task is 2.4 minutes, and the totaltime for all tasks is 18 minutes. The line will operate for 450 minutes per day.a. What are the minimum and maximum cycle times?arrow_forward
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