08-Process%20Capability-class

08-Process%20Capability-class - Section 8 - Process...

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Section 8 - Process Capability UGA FDST 4090/6090 - (c) W.C. Hurst 2010 1 Process Capability William C. Hurst FDST 4090/6090 (2010) Types of Process Limits • Specification Limit – FDST 4090/6090 © W.C. Hurst 2010 USL = LSL = Types of Process Limits • Natural Tolerance Limit – FDST 4090/6090 © W.C. Hurst 2010 UTL = LTL = Types of Process Limits • Control Limit – FDST 4090/6090 © W.C. Hurst 2010 UCL = LCL = Potential Process Capability specification width USL - LSL C p = natural variation = 6 σ ^ FDST 4090/6090 © W.C. Hurst 2010 Where USL = LSL = σ = ^ CASE 1 FDST 4090/6090 © W.C. Hurst 2010
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Section 8 - Process Capability UGA FDST 4090/6090 - (c) W.C. Hurst 2010 2 CASE 2 FDST 4090/6090 © W.C. Hurst 2010 CASE 3 FDST 4090/6090 © W.C. Hurst 2010 Estimated Process Standard Deviation OR FDST 4090/6090 © W.C. Hurst 2010 Process Out of Specification FDST 4090/6090 © W.C. Hurst 2010 AND/OR Capability Performance Index • The Capability Performance Index is determined by the following formulae: C pk = Minimum (C pu , C p1 ) where FDST 4090/6090 © W.C. Hurst 2010 • If process is not centered, then C pk < 1.0 Product Out of Specification • For USL: z = 3 C pu FDST 4090/6090 © W.C. Hurst 2010 • For LSL: z = 3 C p1
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08-Process%20Capability-class - Section 8 - Process...

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