The part is compliant: the problem is everything that happens afterwards
maggio 07, 2026
The quality process components approach today goes far beyond final inspection. And yet, many companies still behave as if quality ended the moment a part leaves production with a compliant inspection report. Last week I received a call from a customer. “We have dents on your components.”
In situations like this, the first reaction is almost automatic. Everyone assumes the issue must have originated during manufacturing. So we went directly to the customer and started checking the parts. Dimensions were correct. Gear teeth were correct. Surfaces were correct. Most importantly, there were no visible dents.
When the problem stops being the part
That was the moment when the reasoning started to change. Because up to delivery, the system had been completely under control. The components were shipped in packaging specifically designed to prevent any contact between the teeth. Every part separated, stable and protected during transport. A system developed precisely to avoid impacts and accidental damage.
And in fact, it worked. As long as the packaging remained closed. Then the component entered the customer’s internal process. It was unpacked, washed, moved between departments, temporarily stored, placed near other components coming from different suppliers and eventually assembled into the final system. From that point onward, it became extremely difficult to understand what had actually happened to the component along the path leading to assembly.
The blind spot after inspection
And this is where, in my opinion, one of the biggest blind spots in modern manufacturing appears. We control the product very well, but we often control very poorly everything that happens around the product. Because the component is inspected when it leaves production. But what happens afterwards?
How many times is it handled? How many accidental contacts occur during internal logistics? How many functional surfaces touch each other unintentionally? How many original conditions guaranteed by production are lost the moment the packaging is opened? Very often these phases are not truly controlled. There are general procedures, operator experience and consolidated habits. But rarely is there the same level of attention that exists during machining or dimensional inspection. And yet, this is exactly where many problems begin.
The problem appears where it becomes visible
Visible damage is not always necessary. Sometimes a very small contact between teeth is enough. A nearly invisible micro deformation. A superficial mark that individually appears irrelevant. Then the component reaches assembly and noise appears. Or abnormal vibration. Or unstable behavior that nobody can immediately explain. At that point, the problem appears where it becomes visible, not where it originated. And naturally, the first assumption is that the component itself is defective. But very often the component is compliant. The system around the component is not.
Product and process are not the same thing
I believe this is one of the most important differences today. For years we associated quality mainly with measurable parameters: dimensions, tolerances, roughness, certificates and inspection reports. All necessary. All correct. But the real behavior of a component also depends on everything that happens between one phase and another. It depends on handling, storage, interaction with other components and the way the part is managed after production. This is where product and process stop being the same thing. Because the product may be compliant while the process accompanying that component until final assembly may not be controlled at all.
Quality continues after production
Today this issue is becoming even more visible because mechanical components are increasingly precise, optimized and sensitive compared to the past. As a result, events that years ago would have been considered negligible are now capable of creating real effects on system behavior. For this reason, I believe one of the most important questions today is not simply:
“Is the part compliant?”
But rather: is the entire system accompanying that component until final assembly truly under control? Because sometimes the problem does not start in production. It starts much later.
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