Manufacturing Engineering & Technology
Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 36, Problem 39QTP
To determine

A manufacturer is ring rolling ball-bearing races shown in fig 13.15a. The inner surface has a surface roughness specification of 0.10 ± 0.006μm. Measured values taken from rolled rings indicate a mean roughness of 0.112μm, with a standard deviation of 0.02μm. Fifty thousand rings per month are manufactured, and the cost of rejecting a defective ring is $10.00. It is known that by changing lubricants to a special emulsion, the mean roughness could be made essentially equal to the design specification. Determine the additional cost per month that can be justified for the lubricant.

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