MyOMLab Principles of operations management : Sustainability and supply chain management (Book & eText Access Card)
10th Edition
ISBN: 9780134184111
Author: Jay Heizer, Barry Render, Chuck Munson
Publisher: PEARSON
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Chapter 10, Problem 36P
Summary Introduction
To determine: The total normal time for sharpening one pencil.
Introduction: Timestudy is the basis that helps set the standard time; it would time a sample of the performance of the worker
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Sharpening your pencil is an operation that may be divided into eight small elemental motions. In MTM terms, each element may be assigned a certain number of TMUs: What is the tota l normal time for sharpening one pencil? Convert your answer into minutes and seconds.
At Maggard Micro Manufacturing, Inc., workers press semicon-ductors into predrilled slots on printed circuit boards. The elemen-tal motions for normal time used by the company are as follows:
Reach 6 inches for semiconductors 40 TMUGrasp the semiconductor 10 TMUMove semiconductor to printed circuit board 30 TMUPosition semiconductor 35 TMUPress semiconductor into slots 65 TMUMove board aside 20 TMU
(Each time measurement unit is equal to .0006 min.)Determine the normal time for this operation in minutes andin seconds.
Before completing production, a product must passthrough three stages of production. On the average, a newproduct begins at stage 1 every 6 minutes. The average timeit takes to process the product at each stage is as follows:stage 1, 3 minutes; stage 2, 2 minutes; stage 3, 1 minute.After finishing at stage 3, the product is inspected (assumethis takes no time). Ten percent of the final products arefound to have a defective part and must return to stage 1 andgo through the entire system again. After completing stage3, 20% of the final products are found to be defective. Theymust return to stage 2 and pass through 2 and 3 again. Onthe average, how many jobs are in the system? Assume thatall interarrival times and service times are exponential andthat each stage consists of a single server.
Chapter 10 Solutions
MyOMLab Principles of operations management : Sustainability and supply chain management (Book & eText Access Card)
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