q1_2006 - MIT OpenCourseWare http://ocw.mit.edu 2.830J /...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 2.830J / 6.780J / ESD.63J Control of Manufacturing Processes (SMA 6303) Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . Massachusetts Institute of Technology Department of Mechanical Engineering 2.830/6.780J Control of Manufacturing Processes Quiz 1 March 16, 2006 Open Book and Notes P ROBLEM 1 (25%) E CONOMICAL SPC. The cost and time required to make careful output measurements often determines how and how many samples will be taken. An injection molding process is used to make small electrical connector components. The parts are made in a 4-cavity mold; so 4 ostensibly identical parts are made in a single cycle of the machine. Since the parts are made rapidly, and they have to cool before they can be gauged, two competing methods have been proposed: 1. The weight of each part is measured and the four parts are used as a subgroup of n=4 for charting purposes 2. The parts are removed from the sprue and dropped into a bin, from which parts are randomly sampled and used to create charts based on n=4...
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This note was uploaded on 09/24/2010 for the course MECHE 2.830J taught by Professor Davidhardt during the Spring '08 term at MIT.

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q1_2006 - MIT OpenCourseWare http://ocw.mit.edu 2.830J /...

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