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Slide 221 of 241

Preliminary Process Capability Studies

  • Characteristics identified in the control plan

  • Usually 100 pieces minimum

  • May be 30 if run is less

  • Ppk Ť 1.67 is acceptable unless otherwise specified

  • Ppk Š 1.67 requires action plan unless otherwise specified

  • Reference AIAG Fundamental SPC Reference Manual

    1.0 at spec limit

    +-3 sigma = 1.67
    Allows ‘flop’ within spec limit

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