A Study on t Chart for Short-Run and Mixed Model Productions

At present a wide variety of mixed products with small batch sizes is one of the manufacturing modes in modern production. It is difficult to apply traditional Shewhart’s control charts efficiently and effectively in such environments. In this paper, we propose a t chart for monitoring a process which has the characteristics of not only being short run but also with mixed product. This new t chart is used to monitor the process mean for two illustrative examples and it is shown that this chart can work effectively in short run manufacturing for mixed product.