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Chapter 2: Question 8-4DQ (page 189)

What is the essential requirement for mixed-model lines to be practical?

Short Answer

Expert verified

A mixed-model assembly line (MMAL) is a sort of production line that assembles many unique versions of a commodity.

Step by step solution

01

Mixed-model lines

Mixed-model assembly lines are an essential aspect of mass manufacturing methods and therefore are usually beneficial in sectors with a modest product variation as well as large volume, including such automobile, electronics, as well as equipment. An assembly line is a series of workstations where a collection of components for one or even more item categories are integrated.

02

The essential requirement for mixed-model lines to be practical

A corporation must devise a cycle mix that minimizes stock build-up while maintaining a consistent cycling timeframe. They believe that for amixed-modelingline to be feasible, operators must be able to exchange work aspects. Operators for addition as well as subtraction are available.

Trained workers can practically self-balance at varying levels of output, and they can also assist one another. With a third worker, production might be increased. Mixed-model lines in contemporary production facilities must have a significant level of item variety.

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Most popular questions from this chapter

A firm uses a serial assembly system and needs answers to the following:

a. An output of 900 units per shift (7.5 hours) is desired for a new processing system. The system requires the 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?

b. How efficient is your system with the cycle time you calculated?

c. Station 3 changes and now requires 45 seconds to complete. What will need to be done to meet demand (assume only 7.5 hours are available)? What is the efficiency of the new system?

Question:Large-scale integrated (LSI) circuit chips are made in one department of an electronics firm. These chips are incorporated into analog devices that are then encased in epoxy. The yield is not particularly good for LSI manufacture, so the AQL specified by that department is 0.15 while the LTPD acceptable by the assembly department is 0.40.

  1. Develop a sampling plan.
  2. Explain what the sampling plan means; that is, how would you tell someone to do the test?

Question: Match the quality 鈥済uru鈥 with the specific aspects of their teachings. Use C for Crosby, D for Deming and J for Juran.

____ Defined quality as 鈥渇itness for use.鈥

____ Defined quality as 鈥渃onformance to requirements.鈥

____ Set the performance standard as 鈥渮ero defects.鈥

____ Defined 14 points for management to follow.

____ Emphasized a general management approach to quality, especially the human elements.

____ Rejected the concept of statistically acceptable levels of quality.

____ Stated that less than 20 percent of quality problems are due to workers.

____ Recommended continuous improvement to reduce variations.

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鈥檚 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)?

Question: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 into the system.

What is the average hourly output of the process when it is in normal operation?

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