Acronyms Are Hard: SPC Statistical Process Control
What’s probably the strangest acronym in MES? That’s most defiantly going to be SPC. John’s one of the foremost SPC experts and he tells us that it stands for Statistical Process Control…So we’ll believe him!
Catch up on the Acronyms Are Hard: MES blog post.
Statistical Process Control is used when making production runs and testing within those runs. Let’s say you make 50,000 pounds of sausage on one particular line everyday. In a perfect world, each sausage link would be exactly the same. We don’t live in a perfect world. Some of the sausage links are going to have extra fill in them. Worse if if there are under filled that’s when customers are going to be upset.
How do you figure out if they are over or under filled? Take measurements along the way!
Once the measurements are complete, we can use statistical modeling, regression analysis, and graphical representation to see how we’re doing.
Why is this important?
Simply because if we’re over or under filling the sausages, we need to know ASAP. If all 50,000 pounds of sausage are under filled and we cannot use them, then we’ve wasted a day.
Corso likes to use dynamic screens to depict what is occurring. This way you need the smallest number of screens possible and you can gain the most amount of information possible.
The main goal of SPC is to catch an issue before it occurs. If the sausages are trending closer and closer to the limits, then there’s a problem. This could mean that there is a machine problem that need preventative maintenance before something happens. This could also mean operator error.
Take it to the next level and you can compare daily, weekly, monthly, and longer results against preventative maintenance to better understand your process. Want to know who does this? John, we’d call him the foremost SPC expert, but he’d blush, so we relent and call him one of the foremost SPC experts.
Don’t make sausage?
Not a problem. Consider any facility making production runs, which will include all your food and beverage facilities and manufacturing. Your cars, consumer electronics, and most things you purchase in the store, hopefully have SPC as part of their process.
Learn more about Manufacturing Execution Systems.
Or catch up on all the Acronyms Are Hard posts!