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The modified process capability index takes into account both setting and spread
of data. CPK is specified as the minimum of:
limitMin -X
The most common requirement is 1,33. However, some manufacturers require a
CPK value of 1.5 or higher.
Min Max
Both CP and CPK are high.
14.3.1 Six-Sigma Improvement Program
The Six-Sigma improvement program was first introduced at Motorola. The
objective of this program is to obtain a CP of at least 2.0 in all of the company's
processes. For a centred process this means that the distance from the mean to
the tolerance limits will be at least six sigma.
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