![]() ![]() ![]() This means, in principle, that you have no reason to react until the control chart signals certain behaviour.Ī commonly used control graph is the XR graph, where the position and spread of the process are monitored with the help of sub groups and control limits. The function of control limits is to centre the process on the target value, which is usually the same as the middle of the tolerance width, and to show where the limit of a stable process lies. They have nothing to do with tolerance limits, because they are designed to call your attention when the process changes its behaviour.Īn important principle is that control limits are used along with the mean value on the control graph to control the process, unlike tolerance limits, which are used along with individual measurements to determine whether a given part meets specifications or not. Control limits are an important aspect of statistical process control. ![]()
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