The Multi-Vari Chart: An Underutilized Quality Tool

Article

Zaciewski, Robert D.; NĂ©meth, Lou   (1995, ASQC)   General Motors Powertrain, Ypsilanti, MI

Quality Progress    Vol. 28    No. 10
QICID: 13016    October 1995    pp. 81-83

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Article Abstract

The multi-vari chart is a key to identifying root causes of excessive variation. It is especially useful for inside and outside diameters, runout, and taper. It is applicable in service and manufacturing sectors. In a case study, a grinding operation had been producing parts with unacceptable variation in outside diameter and taper that was out of specification. A multi-vari chart was constructed to display four readings for eight different runs, each consisting of six consecutive pieces. The chart showed the taper variation to be nonrandom and pointed to a problem in the dressing process. Corrective actions in this process decreased the taper and the variation in outside diameter.

Keywords

Variation,Case study,Root cause analysis (RCA),Problem solving,Multi-vari studies


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