How do you "get started" with SPC? Well, it's easy to jump straight into the quality control charts. Exhaustive explanations of whether it would be better to use the acceptance chart or the extended Shewhart chart, technical explanations of how to save a control chart. Cute. But nothing more. The real work is before that. And no software in the world can help you with this.
What exactly is the process?
This question was already asked in the article on process analysis. Because if you start with "control charts", you first have to ask yourself what can be regulated at all? And what do you actually have to control with control charts?
A measuring machine makes life easy for itself.
Component --> Measure --> Done
Now, where does this measurement fit in? For most measuring machine manufacturers, "to the part". Nice.
In the field of statistics, we must first ask the question, does the part belong to:
- A machine capability
- A 1-part perun
- A 5-part perun
- A type 1 study
- A type 2 study
- A type 3 study
- A process capability analysis
- An ongoing SPC process
And for process capability and the ongoing SPC process, few other questions arises:
- Does the merging of data have to happen simply per part?
- Can a part be manufactured on different machines?
- Do cavities have to be considered separately because they can be controlled?
- …
In short: What can be "controlled" at all? What is an individual characteristic required for in the test plan if this is to be regulated with quality control charts?
This is an elementary component of the so-called "K-field workshop"
Link to K-Field-Workshop Case Studie