In the last section we talked about calculating the control limits of a process and we had some formulas and predefined factors to work with. Well, those were by far the simplest tools available to a six sigma-compliant process. We still have some more formulas ahead to help us see where our...

Using Statistical Process ControlPart 2- by Ivan An X bar R chart is used to graph variation of a process. It helps us understand if a process is healthy or not. As you can see in the figure below an X bar R chart,has two axes. However, the X and R are not the axes,they both denominate a section...

In the last article we discussed the XR Charts or rather how to start off a Control Chart. In this section we are going to discuss how we decide where to set the control limits? Well, after all our data falls within the specification limits we’ll use the following formulas for the averages...

Some years ago I was participating in a class on the Metric system tools, our instructor, a mechanics engineer, asked, “What is a quality product?” We suggested ideas as one without defects, or one done right at the first try. After a brief explanation he concluded, "A quality product is the one...