THE MISUSE AND ABUSE OF SPC - A CASE-STUDY EXAMINATION

A study has been carried out of the application of SPC at an automotiv e supplier specializing in the manufacture of small, high-precision in tegrity metallic components. The technique has been introduced success fully and a number of benefits realized. However, there are certain op erational difficulties with its use which may lead to frustration if l eft unchecked. These include: (a) variation in measurement methods; (b ) lack of a reaction plan to out-of-control points; (c) failure to not e on the chart any additional samples which have been taken and other changes to the process; and (d) a failure to undertake gauge variation studies. These difficulties are discussed together with the means of resolving them.