Author(s): Glenn Samuel D, Dr. Philip Selvaraj D and Dr. Devaarul S

Abstract: In this article, a novel algorithm is introduced to monitor the process mean and a novel process capability index is developed for a normal production process. The new process capability index is able to deduct the capability of the process more accurately. An illustration is given for turning operations carried out in CNC machining centre. The work piece material used in the turning process is AISI 304 stainless steel. The process parameters used in the turning operations are 200 m/min cutting speed, 0.05 mm feed rate and 0.5 mm depth of cut. It is found that the new index is robust and can give warning if the spread is more in the process. It is found that when the mean is in the dynamic target, the process spread shows few warnings through the control charts. From the process capability analysis, it is found that the Cpk is less than one for the observed data. This shows that the process is not adequate of meeting the required dynamic target. Where as the newly developed algorithm is capable of meeting the required capability. Hence it is advisable to utilize CTpk to prevent future non-conformities.

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