6xsigma - Voice of the Process, USL-LSL - Voice of the Customer, centered process - Capability goals 1, minimum variability - Capability goals 2, instrument wear and tear - a source of common cause variation, poor lot of raw material - a source of special cause variation, common cause variation - within subgroup variation, special cause variation - between subgroup variation, I-MR chart - control chart when subgroup size is 1, Xbar-R chart - control chart when subgroup size is 5, Xbar-s chart - control chart when subgroup size is 10, normal distribution - Capability requirement 1, stable process - Capability requirement 2, sigma-hat = MR-bar/d2 - estimate of process standard deviation for I-MR chart, sigma-hat = R-bar/d2 - estimate for process standard deviation for Xbar-R chart, sigma-hat = s-bar/c4 - estimate of process standard deviation for Xbar-s chart, Cp=(USL-LSL)/6sigma - Potential capability index, Cpk=min(Cpu, Cpl) - Process capability index (actual capability), (USL-Xbar)/3sigma - Cpu, (Xbar-LSL)/3sigma - Cpl,

Process Capability lecture 1

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