Measuring a small mechanical component and verifying the alignment of an industrial structure several metres long are both metrology activities. Yet they require profoundly different approaches, operating methods and instruments.
This is precisely where one of the most important aspects of metrology emerges: there is no single best instrument, only the instrument best suited to what needs to be measured.
Object dimensions, geometry, required tolerances, point accessibility, surface characteristics and operating environment conditions are just some of the variables that need to be considered before starting a measurement activity.
Technology, therefore, comes after the problem. First, it is necessary to understand what information is required and the level of accuracy with which it must be obtained. Only then is it possible to define the method and select the most appropriate instrumentation.
This is the approach Tracciatori adopts for its metrology activities, combining specialist expertise with a diversified range of instruments to meet different measurement requirements.
Metrology: When Measurement Becomes a Decision-Making Tool
Metrology is the science of measurement and plays a fundamental role in industrial processes where dimensions, geometries, tolerances and positioning need to be verified.
At Tracciatori, metrology expertise is applied across three main areas: metrology surveying, metrology alignment and reverse engineering.
In metrology surveying, the objective may be to verify the actual geometry of a component or structure and compare it with design specifications. In alignment activities, measurement becomes an operational tool for checking and correcting the relative positioning of machinery, axes or structural elements. In reverse engineering, finally, acquiring the existing geometry makes it possible to digitally reconstruct components for which a three-dimensional model is required.
Different contexts, therefore, also require different measurement technologies.
Measuring Arms: Portable Accuracy Directly on the Component
Articulated measuring arms make it possible to bring metrology directly to the object being inspected, in many cases eliminating the need to move components and manufactured parts to fixed measuring systems.
Their operating principle allows the operator to reach different points on the surface and acquire their three-dimensional coordinates. Depending on the configuration, measurements can be performed using contact probing or non-contact laser scanning.
The instruments available to Tracciatori include FARO ScanArm Quantum X and FARO ScanArm Edge, used with different Laser Line Probes.
The ability to combine contact measurement and laser acquisition makes these systems particularly versatile. The probe enables the acquisition of specific points and defined geometries, while scanning makes it possible to rapidly collect a large amount of information about the object’s surface.
This makes measuring arms suitable for activities such as dimensional inspection, geometric verification, comparison between the actual component and the CAD model, quality control and reverse engineering.
It is therefore not simply a matter of measuring a distance or a dimension: the result can become a complete digital representation of the component’s actual geometry.
MetraSCAN 3D: Rapidly Acquiring Complex Geometries
When the requirement is to acquire a large amount of geometric information without contact, 3D scanning represents another important option.
The Creaform MetraSCAN 3D is a metrology-grade optical 3D scanner designed for measurement and quality control activities, including those carried out in production environments.
Its operating principle differs from that of an articulated measuring arm: the operator can freely acquire the surfaces of the component while the system determines its position in space, progressively building a high-density three-dimensional representation.
The advantage becomes particularly evident when working with complex surfaces, organic shapes or components featuring geometries that are difficult to describe through a limited number of points.
The resulting point cloud or three-dimensional model can subsequently be used to perform dimensional inspections, comparisons with the nominal CAD model or reverse engineering activities.
In this case, measurement becomes a true digitalisation of the physical object.
Laser Trackers: Accuracy on a Large Scale
Now the scale changes completely.
When the object to be inspected is a large structure, an industrial machine or an extensive assembly, a technology capable of maintaining high levels of accuracy over much larger measurement volumes is required.
This is where laser trackers come into play.
Tracciatori uses FARO Vantage Laser Trackers and API Laser Trackers, portable systems designed to accurately determine the three-dimensional position of points in space.
The laser tracker follows a dedicated reflector positioned at the points to be measured. By measuring distance and angles, the system determines the three-dimensional coordinates of the target in relation to its reference system.
This operating method makes it possible to carry out inspections directly within the operational environment, making laser trackers particularly effective for dimensional inspection of large components, verification of structures and assemblies, machinery installation and metrology alignment.
It is precisely in alignment activities that measurement takes on a particularly practical role: accurately determining the actual position of individual elements makes it possible to compare it with their theoretical position and guide any necessary corrections.
From Individual Components to Large Structures: Why Different Technologies Are Needed
Articulated measuring arms, optical scanners and laser trackers are not absolute alternatives to one another. They address different problems and, in some projects, can become complementary.
A component featuring numerous complex surfaces may require high-density scanning. A series of dimensions or geometric features can be effectively verified using a measuring arm. A large structure, on the other hand, may require a laser tracker.
The choice always depends on what needs to be measured and the result that needs to be achieved.
This is why the range of available instruments represents only one part of the metrology process. Measurement quality begins first and foremost with planning the activity: defining references, selecting the points or surfaces to be acquired, establishing the required accuracy and correctly interpreting the results.
From Measurement to Model: The Role in Reverse Engineering
The availability of three-dimensional scanning and measurement systems also opens up possibilities that go beyond dimensional inspection alone.
In reverse engineering, for example, the process starts from the physical object and leads to its digital reconstruction.
Acquisition using measuring arms or 3D scanners makes it possible to obtain detailed information about the existing geometry. The data are then processed to reconstruct surfaces and geometries and obtain a digital model that can be used for analysis, design, replication or modification of the component.
In this case, the quality of the final result depends not only on the number of points acquired, but also on the ability to correctly plan the survey and interpret the object’s geometry.
Once again, therefore, the instrument is the means, not the result.
Tracciatori’s Metrology Instrumentation
Having different technologies available allows Tracciatori to define the working methodology according to the actual requirements of each project.
FARO ScanArm Quantum X, FARO ScanArm Edge, Creaform MetraSCAN 3D, FARO Vantage Laser Trackers and API Laser Trackers make it possible to address different measurement scales and challenges: from the inspection of individual components and the digitalisation of complex geometries to the verification and alignment of large structures.
What makes the difference, however, is not simply the availability of technology.
The value comes from the integration of instrumentation, metrology expertise and measurement methodology. This means understanding the problem, identifying the most effective technology, acquiring data under the correct conditions and delivering information that can be effectively used by the client.
Accuracy Begins with Choosing the Right Method
In metrology, focusing exclusively on instrument accuracy risks telling only part of the story.
A reliable measurement results from a sequence of choices: understanding the objective, defining the method, selecting the technology, correctly acquiring the data and interpreting them within the context of the project.
For this reason, having different instruments available is important, but even more important is knowing when and how to use them.
This approach enables Tracciatori to carry out surveying, inspection, alignment and reverse engineering activitieson a wide variety of components and structures, transforming instrumental accuracy into reliable information that supports technical decision-making.
If this topic is relevant to your organisation, we are available to discuss your requirements: feel free to contact us.
