Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Chapter 1, Problem 5P

For the devices described in Problems1−14, write a set of functions and design requirements in a similar manner to those in Section1−4. You or your instructor may add more specific information to the general descriptions given.

5. An automatic transfer device for a production line.

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1. Consider the assembly system shown below. All workstations on the main line have an average time to failure of 1,000 cycles. Workstations on the feeder lines have an average time to failure of 800 cycles. All workstations have an average time to repair of ten cycles. The buffer has a capacity of 10 units. Find the availability of the line.
Table 3 shows the process sequence in a production line and its related direct time study data. The production process must follow a specific route of processes A, B, C, and D respectively. Task A is in full automatic mode and requires one operator at the workstation. The worker at task B was rated with 90%, the worker at task C was rated with 115% and the worker at task D was rated with 80%. The standard allowances accepted by the company are 6% for fatigue, 5% for personal, and 4% for delay. The normal operating period is 8 hours per day and 24 days per month. Analyse the given information and determine the standard time for the product in minutes. Table 3: Average Processing Time (minutes) Job Description Average Processing Time A Automatic B Manual 40 C Manual 30 D Manual 35
1. (a) Determine the economic number of machines to assign an operator based on the following: Activity Time(min) Load 8 Unload 6. Run (automatic) 92 Inspect and Package 3 Travel Ci = $20/h; C2= $24/h (b) What value of C/C2 is the break-even value for assigning n or n + 1 machines? (c) What are the respective idle minutes per cycle for each (man and machine) based on an assignment of one machine? Eight machines?

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Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)

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