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Chapter 2: Question 8-3DQ (page 189)

How do you determine the idle time percentage from a given assembly-line balance?

Short Answer

Expert verified

Assembly line balance is the process of determining how jobs should be allocated to workstations to reach a particular objective.

Step by step solution

01

Assembly line 

Assembly line balance is a production technique that establishes an expected pace of manufacture to manufacture a certain item within a specific time. Furthermore, the assembly line must be successfully structured, with jobs allocated among employees, equipment, as well as workstations to ensure that all line segments in the manufacturing process can be satisfied within the given timeframe as well as accessible manufacturing capability

02

Determine the idle time percentage from a given assembly-line balance

In the chapters, the idle-time proportion is referred to as the balancing lag. It is just one minus effectiveness, where performance equals the total of task durations divided by the total number of terminals multiplied by the processing times. For instance, when blackboard goes offline for repairs each week, they have a specific amount of extra time to get it back up as well as operating; if they mix up as well as go over, people have to wait longer to access blackboard when it must have been preserved.

The amount of stations is not intentional, but instead a result of the balancing work, which comprises creating the smallest downtime as well as the inactive period for every site and the entire line, and each site, has a load that is as near to the workload of other sites as feasible.

Assembly linebalancing is best described as the process of delegating various tasks to various workstations. This is conducted in such a way that the idle period for each workstation is kept to a minimum. In this case, idle time refers to the amount of time that elapses after allocating work to specific workstations. The balancing postponement of a specific production line is calculated as a proportion of the idle time.

Percentageofidletime=IdletimepercycleNactual×Cycletime×100

In this situation, Nrepresents the number of assembly line balancing stations. As a result, the real production line balancing as well as idle duration each cycle aid in determining the idle period percentage.

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Most popular questions from this chapter

L. Winston Martin (an allergist) has an excellent system for handling his regular patients who come in just for allergy injections. Patients arrive for injection and fill out a name slip, which is then placed in an open slot that passes into another room staffed by one or two nurses. The special injections for a patient are prepared, and the patient is called through a speaker system into the room to receive the injection. At certain times during the day, patient load drops, and only one nurse is needed to administer the injections. Let’s focus on the simpler case of the two—namely when there is one nurse. Also, assume that patients arrive in a Poisson fashion and the service rate of the nurse is exponentially distributed. During this slower period, patients arrive with an inter-arrival time of approximately three minutes. It takes the nurse an average of two minutes to prepare the patients’ serum and administer the injection.

a.What is the average number you would expect to see in Dr. Martin’s facilities?

b.How long would it take for a patient to arrive, get an injection, and leave?

c.What is the probability that there will be three or more patients on the premises?

d.What is the utilization of the nurse?

e.Assume three nurses are available. Each takes an average of two minutes to prepare the patients’ serum and administer the injection. What is the average total time of a patient in the system?

An assembly line is to operate eight hours per day with the desired output of 240 units per day. The following table contains information on this product’s task times and precedence relationships:

Task

Task Time (seconds)

Immediate predecessor

A

60

-

B

80

A

C

20

A

D

50

A

E

90

B,C

F

30

C,D

G

30

E,F

H

60

G


  1. Draw the precedence diagram.
  2. b.What is the workstation cycle time required to produce 240 units per day?
  3. Balance this line using the longest task time.
  4. What is the efficiency of your line balance, assuming it is running at the cycle time from part (b)?

A common problem that many drivers encounter is a car that will not start. Create a fishbone diagram to assist in the diagnosis of the potential causes of this problem.

Why might it be difficult to develop a manufacturing cell?

Question: 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

a. Draw the precedence diagram.

b. What is the workstation cycle time required to produce 15 units per hour?

c. Balance the line so that only four workstations are required. Use whatever method you feel is appropriate.

d. What is the efficiency of your line balance, assuming the cycle time from part (b)?

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