Setup approval and self starting schemes for short production runs

Abstract

A number of approaches have been proposed for applying statistical process control in short production runs. However little has been done to provide a methodology to compare and select from various statistical process control schemes or address setup approval, which is one of the most critical aspects of short production run. This research proposes a joint monitoring scheme that includes application of a combination of setup approval and self-starting scheme in short production run. The research also provides a methodology for selecting between setup approval and self-starting schemes based on robustness of these schemes to different levels of process shifts and capabilities. The scope of this research is limited to two setup approval schemes; Wheeler and Precontrol and two self starting schemes Q charts and Dynamic Exponentially weighted moving average charts.