Abstract: On the basis of previous calculation model of multivariate process capability index, a new model based on gauge capability was presented. A new factor—gauge capability was introduced into this model, which reflects the gauge measurement errors. The real example shows that the previous calculation models which ignore the gauge measurement errors underestimate the process capability indices, while this new model can correct the deviation and better reflect the real manufacturing situation.  

Key words: measurement system capability, measurement system error, multivariate process capability indices