
Concept explainers
a
Interpretation: Tasks for each workstation, total time and idle time are to be calculated.
Concept Introduction:
Longest task time first rule:In this rule of line balancing, the task which has highest cycle time is assigned first to the workstation.
a

Explanation of Solution
Cycle Time:
It is the time between two consecutive outputs come out from a process.
Here CT = Cycle time; A = Available time to produce output; R = Demand
Assembly line:
It is a manufacturing process in which goods or services created in previous steps are joined together. Assembly line efficiency can be calculated by following formula:
Here t = Task time; N= Actual no. of workstations; CT = cycle time
Idle time:
It is time for which machines or employees do not work due to the stoppage or work for any causes.
Here N= Actual no. of work stations; CT= cycle time; t = task time
Assembly time per shift (A) = 480 min
No. of shifts each day = 1
Output forecasted per shift(R) = 60 units
The theoretical minimum no. of the workstation can be obtained as follows:
Here CT= Cycle time; t= Sum of tasks time;
Theoretically, minimum no. of the workstation is:
Line balancing by longest task time first rule can be calculated as follows:
Lines balanced by the assignable task are determined by longest task time first rule. It has following steps:
Task 2 has highest processing time and no prerequisite is required therefore it is assigned on station A.
Although task 1 has highest processing time after task 2 in that case, total time exceeds the cycle time, therefore, task 4 and 3 is assigned on station A along with task 2 as no prerequisite is required for these tasks.
Task 1 is assigned to station B and there is a tie between task 6 and 7 as both task time is same.
Task5 is assigned to station C as its preceding task 1, 2, 3 has already assigned.
Either task 6 or 7 is assigned to station D.
Finally, task 8 is assigned to station E.
In actual situation no. of workstation are 5 in order to follow precedence and cycle time rule.
Station | Tasks | Total Time(min) | Idle Time(min) |
A | 2,4,3 | 8 | 0 |
B | 1,6 (or 7 tie) | 7 | 1 |
C | 5 | 6 | 2 |
D | 7 (or 6) | 3 | 5 |
E | 8 | 8 | 0 |
Total | 32 | 8 |
Total time at station A= Task Time of task 2+ Task Time of task 3+ Task Time of task 4
Total time at station A = 5+1+2
= 8 min
Idle time at station A= Cycle time-Total tasks at station A
= 8-8
= 0 min
Total time at station B = Task Time of task 1+ Task Time of task (6 or 7)
Total time at station B = 4+3
=7 min
Idle time at station B= Cycle time-Total tasks time at station B
=8-7
=1 min
Total time at station C = 6 min
Idle time at station C= Cycle time-Total tasks time at station c
= 8-6
= 2 min
Total time at station D= Task time of task 7 or 6
Total time at station D= 3 min
Idle time at station D= Cycle time-Total tasks time at station D
= 8-3
= 5 min
Total time at station E= Task Time of task D
Total time at station E= 8 min
Idle time at station E= Cycle time- Total tasks time at Station E
= 8-8
= 0 min
Total time
Total idle time:
It can be calculated as follows:
b
Interpretation:Assembly line efficiency is to be determined.
Concept Introduction:
Assembly line:It is a manufacturing process in which goods or services created in previous steps are joined together. Assembly line efficiency can be calculated by following formula:
Here t = Task time; N= Actual no. of workstations; CT = cycle time
b

Explanation of Solution
Assembly line efficiency can be calculated as follows:
c
Interpretation:Whether assembly line balance solution is good or bad and a criterion for assessment is to be explained.
Concept Introduction:
Idle time:It is time for which machines or employees do not work due to the stoppage or work for any causes.
c

Explanation of Solution
The assembly line balancing goodness is assessing its assembly line efficiency and idle time. In present case, although the assembly line efficiency is 80% the idle time is 8 min which is very high. It is highest for station D i.e. 5 min and at station B and C has 1 and 2 min idle time respectively. Therefore a fair chance that station B and C becomes bottleneck station for the assembly line. So it is not the very good balancing solution.
Want to see more full solutions like this?
Chapter 8 Solutions
OM (with OM Online, 1 term (6 months) Printed Access Card)
- Monczka Trent shipping is the logistics vendor for Handfield Manufacturing in Ohio. Handfield has daily shipments of a power steering pump from its Ohio plant to an auto assembly line in Alabama. The value of the standard shipment is $261,090. Monczka Trent has two options: (1) it's standard two day shipment or (2) a subcontractor who will team drive overnight with an effective delivery of one day. The extra driver costs $190. Handfield's holding cost is 35% annually for this kind of inventory. A) _ is more economical, with a daily holding cost of _?B) What production issues are not included in the data presented?arrow_forwardSasha is a loan processor for a bank. She's been timed performing four work elements. The allowances for tasks such as this are personal, 7%; fatigue. 8%; fatigue, and delay of 2%. The normal time for the complete operation = (round your irresponsive two decimal places) Standard time for this process = (round your response to 2 decimal places)arrow_forwardagree or disagree with post The tripartite model of culture is based on three cultural prototypes, face, dignity, and honor that represent negotiators’ self-views and are highly correlated with particular geographic regions. According to Vaughn (2023), “face cultures highly value maintaining social harmony and avoiding public embarrassment. People in these cultures are sensitive to the impact of their actions and words on their own and others’ social standing” (p. 1). An example of this in certain societies would be known as losing face. With respect to dignity, “dignity cultures derive self-worth from a sense of inherent human dignity and individual autonomy. Rooted in the concept of intrinsic worth unaffected by external factors, these cultures emphasize personal rights, equality, and respect for all individuals” (Vaughn, 2023, p. 1). An example of this in certain societies would be losing your self-worth. Lastly, in discussing honor cultures, it “links an individual’s self-worth…arrow_forward
- Can you explain the process for solving this general accounting question accurately?arrow_forward1) Read “Walmart Focuses on its Supply Chain” (page 670 in the text) and answer the following questions: a) What improvements has Walmart made to its supply chain system? b) What competitive advantages might Walmart have over Amazon? 2) View the YouTube video How the Mumbai Dabbawalas Work? (3.16 minutes, Ctrl + Click on the link, there are also many longer video clips available on the Internet) and answer the following questions: https://www.youtube.com/watch?v=KDD32skx-zM a) How do the Mumbai Dabbawalas achieve their high service performance? What factors facilitate the success of their distribution network? b) If you want to “modernize” the dabbawalla distribution network, what changes (and why) will you make to the system? a) Retail outlets that do not have an internet presence often complain that consumers come in to “kick the tires,” but then buy online from a competitor. Can you suggest some ways outlets can overcome this challenge? b) Some customers of…arrow_forwardKindly assist with writing the project plan for this A smart mobile platform to boost entertainment event attendance and optimise venue management using geolocation and user engagement analyticsarrow_forward
- Note: Please make sure you label your answers. 2a. Complete the following Make or Buy Analysis. Make or Buy Analysis Food Cost Processed chopped lettuce • $23.80/case of 4, 5 lb. bags • Price/lb Whole head lettuce $16.49/50 lb case • Price/lb AP • 75% yield on whole head lettuce • Price/lb EP Labor Cost Processed chopped lettuce ⚫ No labor cost Whole head lettuce • Cooks are paid $10.85/hr with 20% benefits • It takes 2 hours to process 50 lbs. of lettuce • Benefits • Cook labor cost with benefits • Total labor cost for 1 lb. lettucearrow_forwardanalysis needs to address the following issues: The battery temperatures are a major concern for us. Can you analyze and describe the sample data? What are the average and median temperatures? How much variability is there in the temperatures? Is there anything that stands out? Our engineers’ assumption is that the temperature data is normally distributed. If that is the case, what would be the likelihood that the Safety Zone temperature will exceed 5.15 degrees? What is the probability that the Safety Zone temperature will be less than 4.65 degrees? What is the actual percentage of samples that exceed 5.25 degrees or are less than 4.75 degrees? Is the manufacturing process producing units with stable Safety Zone temperatures? Can you check if there are any apparent changes in the temperature pattern? Are there any outliers? A closer look at the Z-scores should help you in this regard.arrow_forwardFactor Factor Description Weight Present Location Newbury Hyde Park 1 Average community income 0.35 2 Community growth potential 0.15 3 Availability of public transportation 0.20 4 Labor availability, attitude, and cost 0.30 3 2 3 2 35 20 25 75 33 28 55 55 25 75 65 50 50 55arrow_forward
- Subway with more than 27,000 outlets in the US is planning for a new restaurant in Buffalo New York. A) Based on the given information, the best location in Buffalo for Subway to open the new restaurant is Baptist Church with a total weighted score of? (Enter your response rounded to two decimal places.) B) If the weights for Space and Traffic density are reversed, the best location in Buffalo for Subway to open the new restaurant will be with a total weighted score of ? (Enter your response rounded to two decimal places.)arrow_forwardnortheastern insurance company is considering opening an office in the US. The two cities under consideration are going to be Philadelphia New York. Factor ratings (higher scores are better) are in the table. The best location for northeastern insurance company to open would be which with a total weighted score of ? (response rounded to two decimal places)arrow_forwardWhen football fans watch a game, they believe the other side commits more infractions on the field than does their own team. This favoritism can best be termed _____. Group of answer choices A. ethnocentrism B. the fundamental attribution error C. the affiliation bias D. marginalizationarrow_forward
- Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
- MarketingMarketingISBN:9780357033791Author:Pride, William MPublisher:South Western Educational Publishing
