Use when the mean cannot be easily adjusted ie cycle

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Use when the mean cannot be easily adjusted (i.e., Cycletimes, customer satisfaction indices, etc.)Typical goals for Cpk are greater than1.33(or1.67ifsafety related)For Cpk Std. Deviation estimates use:Rbar/d2[short term](calculated from Xbar-R chart)Released: 20160801Process CapabilityBB032.10A Metaphor for Cp– Parking Vehicles 1Released: 20160801Process CapabilityCp§1.3+/ - 3ı(Voice of Process)+/ - 3ı(Voice of Process)+/ - 3ı(Voice of Process)Voice of CustomerFor Cp, it doesn’t matter where the process is relative to the specifications,only the width of the process to the width of the specifications.268
BB032.11A Metaphor for Cpk– Parking Vehicles 2Released: 20160801Process CapabilityCpk§1.3Cpk§1.3:the process has room to move before exceeding acustomer specification.In other words, at least the driver and/orthe passenger can get out of the HMMWV .+/ - 3ı(Voice of Process)BB032.12A Metaphor for Cpk– Parking Vehicles 2Released: 20160801Process CapabilityCpk§0Specifications(Voice of Customer)&SN§±²The center of the process is on (or equal to) a customerspecification (either side)!+/ - 3ı(Voice of Process)269
BB032.13A Metaphor for Cpk– Parking Vehicles 2Released: 20160801Process CapabilityCpk§-1&SN§-1:The center of the process is outside the customer specifications(either side)!Specifications(Voice of Customer)+/ - 3ı(Voice of Process)BB032.14Uses of Capability AnalysisPerformed on existing processes as a means ofestablishing a baseline of current operations (so it’spossible to tell when improvement has occurred)When done periodically, is a means of monitoringdeterioration of a process for whatever reason(system, personnel, environment, etc.)Can be done on any process that has a target spec.established (target spec. is needed for the values innumerator), and has a capable measuring system(needed for valid values in denominator)Released: 20160801Process Capability270
BB032.15Process Capability – CPUCPUindicates capability against an UpperSpecification Limit.In the next example, the averagedelivery time is within the 30 minute requirement.However, the histogram shows that quite a fewdeliveries are exceeding the 30 minute upper spec.limitTheCPUfigure of 0.139 confirms that the process isincapable (<1)Released: 20160801Process CapabilityBB032.16Process Capability – CPUReleased: 20160801Process CapabilityUSL- XCpu=3s271
BB032.17Released: 20160801Process CapabilityMinitab ExerciseOpen Minitab file:Message DeliveryClickStat>Quality Tools>Capability Sixpack>NormalNote:This exercise is based ona different dataset than previousslides so different, unrelatedresults can be expected.BB032.18Released: 20160801Process CapabilityMinitab Exercise (Cont.)1. Double click onC-5 Delivery TimetoPlace it in the box forSingle column2. In theSubgroup sizeBox, type a5since wetook 5 data points per day4. Click onOK3. ForUpper Spectypein30 minutes(given)– we have no lower Spec – so leave BLANK!

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Process capability