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A company uses a variable speed honing machine to increase the smoothness of the inside walls of hydraulic jacks. The hone uses acid-dipped brushes to perform this operation. Increasing the speed of the machine results in faster operation but

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A company uses a variable speed honing machine to increase the smoothness of the inside walls of hydraulic jacks. The hone uses acid-dipped "brushes" to perform this operation. Increasing the speed of the machine results in faster operation but reduces brush life. A single "brush" costs $90.00 and can be refurbished several time before its useul life over, (The number of refurbishing depends on the horning speed). Each refurbishing costs $30.00. Assume a refurbished brush can smooth the same amount as a new, and that when purchased a new brush is ready to use. The operating cost for the hone and operator is $70.00/hr. Below is the data for operating the hone at 3 different speeds. The time required for changing brushes is incorporated into the honing rates below. Which honing speed is most economical? Honing speed (RPM) 180 240 300 Hone rate 7 10 12 No of jack polish until brush need refurbish 12 8 6 2 1

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To determine the most economical honing speed, we need to calculate the total cost for each speed, t View the full answer


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Engineering Economy

Engineering Economy

ISBN: 978-0132554909

15th edition

Authors: William G. Sullivan, Elin M. Wicks, C. Patrick Koelling

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Posted Date: May 28, 2023 23:21:16
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