QUALITY EN
QUALITY EN MECH5710
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A PCB assembly line consists of 3 operations: Screen the boards, Place the components and solder the components in an oven.

A PCB assembly line consists of 3 operations: Screen the boards, Place the components and solder the components in an oven. Each operation is described as follows (all operations are presumed done with Operation average = PROCESS Nominal, and the process is 2-sided distribution. Screen: Quality measured by the height of the material deposited, through a control chart Nominal __10 _mils__USL_12____No lower limit provided Control Chart : R bar __4_____ LCLR __0 ___Sample Size __ 4__ Reject Rate ____________%, _________PPM, Yield _____________% Cp ________, Cpk___________ Place: Quality measured by the defect rate obtained, using nP chart, assume process centered and two-sided specification limit Reject rate __1 in 4,000____ PPM, Yield _____________% Cp ________, Cpk___________ Oven Quality measured by # solder shorts in 10,000 parts, using C chart, assume process centered and twosided specification limit Nominal ___2 short/1,000 parts____ C chart : Cbar_______ UCLc _______ LCLc _________ Reject Rate ____________%, _________PPM, Yield _____________% Cp ________, Cpk___________ Total Process: Quality measured by all defects in the line of three machines, assume process centered and two sided specification limit Reject Rate ____________%, _________PPM, Yield _____________% Cp ________, Cpk___________

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