Cumulative Count Of Conforming Research Articles

A comparative study of CCC and CUSUM charts

The cumulative count of conforming (CCC) chart is a new type of control chart used for the monitoring of high-quality processes. Instead of counting the number of non-conforming items in samples of fixed size, the cumulative number of conforming items between two non-conforming items is monitored. The CCC chart is convenient to use in a modern manufacturing environment where the product is inspected individually and automatically. The CCC chart has sometimes been confused with the cumulative sum (CUSUM) chart which has been shown to be more sensitive than the traditional Shewhart chart for small process shifts. In this paper the uses of these two types of charts are compared. It shown by numerical illustrations and analytical results that the two charts function in entirely different ways. However, the CUSUM concept can be applied to cumulative counts used in the CCC chart to improve its sensitivity for small process shifts when the process is producing at a very low non-conforming rate. © 1998 John Wiley & Sons, Ltd.

A comparative study of CCC and CUSUM charts

The cumulative count of conforming (CCC) chart is a new type of control chart used for the monitoring of high-quality processes. Instead of counting the number of non-conforming items in samples of fixed size, the cumulative number of conforming items between two non-conforming items is monitored. The CCC chart is convenient to use in a modern manufacturing environment where the product is inspected individually and automatically. The CCC chart has sometimes been confused with the cumulative sum (CUSUM) chart which has been shown to be more sensitive than the traditional Shewhart chart for small process shifts. In this paper the uses of these two types of charts are compared. It shown by numerical illustrations and analytical results that the two charts function in entirely different ways. However, the CUSUM concept can be applied to cumulative counts used in the CCC chart to improve its sensitivity for small process shifts when the process is producing at a very low non-conforming rate. © 1998 John Wiley & Sons, Ltd.

A study of economic design of control charts for cumulative count of conforming items

In this paper the economic design of Cumulative Count of Conforming (CCC) control charts to maintain the current control of fraction nonconforming of a process is studied. CCC chart is an attribute chart for monitoring high quality processes by plotting the cumulative count of conforming items between two nonconforming ones on a suitable chart. A process model is proposed to obtain an appropriate loss function. An alogorithm to search for the optimal setting of the sampling and control parameters is derived. Numerical illustrations of the method and some properties of the optimal economic design are provided.