“Quality is never an accident...”

Measuring an aluminium extrusion is easy when you only need one width or wall thickness. It becomes much more challenging when a quality team needs to understand whether the entire cross-sectional geometry of a complex profile conforms to its drawing. 

That is where a profile measurement system becomes valuable. 

Instead of checking a limited number of dimensions individually with calipers, micrometers, radius gauges or an optical comparator, modern profile measurement technology can capture the geometry of a profile, evaluate predefined dimensions and compare the manufactured part with its nominal CAD drawing. 

For aluminium extrusion manufacturers, this changes profile inspection from a collection of individual measurements into a more complete view of product geometry. 

This guide explains how profile measurement systems work, which dimensions they can inspect, how they fit into aluminium extrusion quality control and what manufacturers should consider when choosing a system. 

What Is a Profile Measurement System? 

A profile measurement system is a dimensional inspection solution used to capture and evaluate the geometry of a manufactured profile or part. Depending on the technology, it can use cameras, optical sensors, lasers or calibrated scanners to acquire the part geometry and measurement software to calculate dimensions and geometric tolerances and compare the result against specifications. 

For aluminium extrusion, the term commonly refers to systems that inspect the cross-section of an extruded profile. 

The objective is not simply to answer: 

Is this width correct? 

A more comprehensive profile inspection can answer: 

• Is the overall profile geometry correct?
• Are individual walls within tolerance?  
• Are radii and angles correct?  
• Are internal features positioned correctly?  
• Are several related dimensions changing together?  
• Where does the manufactured contour deviate from the CAD drawing?  
• Is one cavity of a multi-cavity extrusion die behaving differently from another?  

This distinction matters because aluminium profiles can contain numerous walls, channels, slots, radii and other geometric features within a relatively small cross-section. 

Industry standards therefore address much more than one overall dimension. The Aluminum Association's extrusion tolerance guidance, for example, covers topics including metal dimensions, space dimensions, straightness, flatness and perpendicularity.  

Why Aluminium Profile Measurement Can Be Difficult 

Extruded profiles range from relatively simple solid sections to highly complex hollow profiles with multiple internal holes. 

A customer drawing may contain dozens of dimensional and geometric requirements. 

Common inspection characteristics include: 

• Overall width
• Wall thickness  
• Internal and external distances  
• Diameters 
• Angles 
• Radii  
• Feature positions  
• Parallelism  
• Perpendicularity 
• Symmetry  
• Profile or contour tolerances  

More sophisticated drawings may also use geometrical dimensioning and tolerancing (GD&T) to define how features should relate to one another.  

ISO 1101 defines the fundamental language and rules for geometric tolerancing of form, orientation and location. 

For aluminium profiles used in Europe, EN 755-9 and EN 12020-2 covers tolerances on dimensions and form for extruded aluminium and aluminium-alloy profiles for general engineering applications.  

The challenge for quality teams is therefore not simply measurement accuracy. It is obtaining enough information about the cross-section to understand what is happening to the profile as a whole

Manual Measurement vs. Automated Profile Measurement 

Calipers, micrometers and gauges remain valuable tools in extrusion plants. Automated inspection does not make them irrelevant. 

The difference is mainly one of coverage, repeatability and data handling. 

Caliper

Best for fast measurement of accessible dimensions. Its main limitation is that it measures selected points individually rather than the complete profile geometry. 

Micrometer

Useful for precise thickness or distance measurements. However, it is limited to features that are physically accessible. 

Radius gauge

Provides a simple way to verify radii. The process is largely manual and typically provides less detailed quantitative information. 

Optical comparator

Allows operators to visually enlarge and inspect profile geometry. Depending on the workflow, evaluation can still require significant operator interaction and manual interpretation. 

2D profile measurement system

Designed for automated inspection of the complete cross-sectional geometry of a profile. It can evaluate multiple dimensions and compare the measured contour with CAD data, although it requires a properly prepared cross-sectional sample. 

Inline measurement system

Provides continuous or near-continuous monitoring during production. It is well suited to real-time process control but usually involves different installation, integration and investment requirements compared with offline inspection systems. 

The important question is therefore not “Which tool replaces every other tool?” 

It is: 

Which measurement method provides the information required for the quality decision? 

If an operator needs to verify one accessible dimension, a caliper may be perfectly suitable. 

If a quality engineer needs to evaluate dozens of dimensions, identify geometric deviations, compare an extrusion against CAD and preserve the inspection results for later analysis, an automated profile measurement system can provide much more information from the same sample. 

How Does a 2D Profile Measurement System Work? 

A scanner-based 2D profile measurement system converts the physical cross-section into calibrated digital geometry that can be measured and compared with engineering data. 

A typical workflow consists of five stages. 

1. Prepare a Cross-Section Sample

A section of the extruded profile is cut for inspection. 

Correct sample preparation remains important because the image should represent the true cross-sectional geometry rather than cutting artefacts. 

2. Capture the Profile

The sample is placed on the measurement system. 

In the case of Scan Fit & Measure, calibrated flatbed scanning technology is used to capture the complete visible profile cross-section. 

The SFM 250, for example, has a maximum measuring area of 200 × 250 mm and lists an average measuring speed of approximately thirty seconds per part.  

3. Align the Scan With the CAD Drawing

Software aligns the captured profile geometry with the nominal CAD drawing. 

This is important because simply putting the two contours on top of one another would not necessarily produce a meaningful comparison. The system must use a defined alignment or best-fit method according to the inspection objective. 

4. Evaluate Dimensions and Tolerances

The software calculates the dimensions and geometric tolerances contained in the measurement plan. 

Instead of an operator measuring every feature individually, multiple dimensions can be evaluated as part of the same inspection routine. 

5. Generate the Inspection Result

The operator receives measurement results showing whether the inspected dimensions are within the specified tolerance. 

SFM can provide colour-coded measurement information, profile-tolerance visualization and digital comparator views, allowing the operator to examine both numerical results and the geometry of the deviation. 

What Can a Profile Measurement System Measure? 

The exact capabilities depend on the equipment and software, but a system designed specifically for extrusion quality control should go beyond simple linear dimensions. 

Dimensional Measurements 

These can include: 

• Width
• Distance 
• Wall thickness  
• Diameters 
• Radii 
• Angles  

Geometric Relationships 

More advanced measurements evaluate how one feature relates to another. 

Examples may include: 

• Parallelism
• Perpendicularity 
• Position 
• Orientation 
• Symmetry 
• Constructed geometric features  

This becomes particularly useful when the dimension required by the drawing cannot easily be reached with a physical measuring tool. 

Full Profile Tolerance 

One of the most useful differences between isolated manual measurements and digital profile inspection is the ability to assess the contour itself. 

A profile can technically pass several individual dimensions while still showing unwanted deformation elsewhere. 

A profile tolerance view helps quality engineers see where the manufactured geometry differs from the nominal contour rather than relying only on a list of dimensions. 

Alt text: Scan Fit & Measure tolerance inspection showing a scanned profile compared against nominal geometry, with green, yellow, and red zones highlighting dimensional deviations and out-of-tolerance areas. 

CAD-to-Profile Comparison Shows More Than Individual Dimensions 

For many extrusion quality managers, the biggest advantage of scanning the complete cross-section is visual context. 

Imagine that an extrusion contains 25 controlled dimensions. 

A conventional inspection might tell you: 

• Dimension 1: PASS
• Dimension 2: PASS 
• Dimension 3: FAIL  

That information is necessary, but it does not automatically explain the underlying geometry. 

Overlaying the actual scanned contour and nominal CAD drawing gives the engineer another level of information. 

It can help reveal whether: 

• one wall has shifted,
• one region is opening or closing, 
• a radius differs from the intended geometry, 
• several dimensions are being affected by the same deformation, 
• or the profile is changing in a consistent direction.  

This is particularly useful when quality information needs to be communicated to a die shop/maker/corrector, production engineer or customer. 

Scan Fit & Measure includes a Digital Comparator function that overlays the CAD drawing and scanned geometry for visual evaluation.  

Why Full-Profile Inspection Matters in Extrusion Quality Control 

An extrusion die does not always change in a way that affects only one measurement. 

Material flow, die condition, temperature, process settings and other production variables can influence different areas of a profile simultaneously. 

For this reason, looking at the entire cross-section can provide more useful diagnostic information than checking isolated features alone. 

A comprehensive aluminium profile measurement system can help quality teams: 

Detect Deviations Earlier 

More dimensions can be inspected during the same measurement cycle, increasing the amount of geometric information available to the operator. 

Reduce Repetitive Manual Measurement 

A predefined measurement plan can be reused whenever the same profile is produced again. 

This is particularly valuable for profiles containing many controlled dimensions. 

Improve Measurement Repeatability 

Automating the measurement routine reduces differences caused by operators selecting slightly different measurement locations or interpreting a feature differently. 

Provide Clearer Information for Die Correction 

Instead of sending only a table of failed dimensions, the quality department can provide visual information showing where the actual contour differs from the required geometry. 

Create Digital Inspection Records 

Automated reporting provides a digital record that can be reviewed, shared and analysed later. 

That becomes increasingly important as extrusion plants move toward more traceable quality-management workflows. 

Profile Measurement for Multi-Cavity Extrusion Dies 

Multi-cavity dies introduce another quality-control challenge. 

Several profiles are produced simultaneously, but that does not mean every cavity behaves identically. 

One cavity may gradually produce a different wall thickness, feature position or contour deviation than the others. 

Checking only one profile can therefore hide cavity-specific variation. 

With multi-part inspection, several profiles from the same extrusion die can be measured and identified by cavity. Their individual results can then be compared statistically over time. 

SFM and its Measurement Data Center use this approach to combine individual CAD-to-profile inspection with cavity-to-cavity analysis, making it possible to investigate whether one cavity behaves differently or begins to drift relative to the others.  

For extrusion quality managers, the question becomes more useful than simply: 

"Did the production run pass?" 

They can also investigate: 

"Are all cavities behaving the same way?" 

and 

"Is one cavity gradually moving toward its tolerance limit?" 

Measurement Data Is as Important as the Measurement 

Capturing dimensions is only one part of modern quality control. 

The next step is making those measurements usable. 

A profile measurement workflow becomes considerably more valuable when it preserves information such as: 

• Part identification
• Measurement plan 
• Inspection date and time 
• Operator 
• Individual dimensional results 
• PASS/FAIL status 
• Original scan 
• Cavity number 
• Historical measurements 
• Statistical information(Mean, Standard deviation, CpK, Range)
• Real time monitoring view 

When results are accumulated, quality teams can move beyond one-time inspection and begin analysing production statistically. 

Scan Fit & Measure can be combined with the Measurement Data Center, which stores measurement results and provides statistical information such as mean, minimum, maximum, standard deviation, range and Cpk.  

That creates a transition from: 

"Is this part good?" 

to: 

"How is this process changing?"

How to Choose a Profile Measurement System 

When evaluating a profile measurement system for aluminium extrusion, do not compare equipment based on one accuracy figure alone. 

Consider the complete inspection workflow. 

1. Measuring Area

Can the system accommodate the largest cross-sections you manufacture? 

2. Measurement Accuracy

Evaluate the stated accuracy over the measurement range and make sure it is appropriate for your product tolerances. 

3. Profile Complexity

Test the system with your difficult profiles rather than only simple demonstration samples. 

Pay particular attention to: 

• Thin walls
• Narrow channels  
• Small diameter  
• Complex hollow profiles 
• Closely spaced internal features  

4. CAD Compatibility

Determine which engineering formats can be imported and how measurement templates are created. SFM software supports DWG and DXF.  

For recurring products, efficient CAD preparation can save substantial time over the life of the measurement plan. 

5. Measurement Capabilities

Check whether the system supports the dimensions you actually use, including GD&T and constructed features where required. 

6. Visual Profile Comparison

Numerical results alone may not provide enough information for troubleshooting. 

Look for contour overlays and tolerance visualization. 

7. Reporting and Traceability

Ask whether results can be: 

• Stored  
• Retrieved  
• Compared over time
• Exported 
• Shared  
• Connected with SPC or other information systems  

8. Multi-Part Measurement

If you operate multi-cavity dies, consider whether several samples can be inspected efficiently within one workflow. 

9. Shop-Floor Suitability

A laboratory and an extrusion press area have very different environmental requirements. 

Consider installation location, temperature, dust, protection and operator workflow. 

10. Ease of Use

A sophisticated metrology system only provides value when operators can use it consistently. 

The measurement process should make routine inspection easier rather than creating an additional bottleneck. 

Profile Measurement Systems Are Not Only for Aluminium 

Although aluminium extrusion is a major application, the same principle can be applied to other materials where cross-sectional geometry is important. 

Scan Fit & Measure supports applications including: 

• Aluminium extrusions  
• PVC and uPVC profiles  
• Rubber extrusions  
• Medical tubes  
• Gaskets  
• Sheet-material components  
• Membrane electrode assemblies used in hydrogen fuel cells  

Different materials create different imaging and measurement challenges, so the measurement technology should always be evaluated using real parts from the intended application.  

Scan Fit & Measure: Profile Measurement Solution 

Scan Fit & Measure is a 2D profile measurement system designed for automated inspection of extruded profile geometry. 

The system uses calibrated flatbed scanning technology to digitize a cross-sectional sample and evaluate its geometry against predefined measurements and tolerances. 

Rather than relying only on partial measurements from calipers, gauges or conventional comparison methods, quality teams can inspect multiple dimensional and geometric characteristics while also seeing how the entire manufactured contour relates to the CAD drawing. 

SFM supports measurement plans, CAD comparison, dimensional and GD&T inspection, profile tolerance visualization, digital comparator functionality, reporting and measurement-data integration. Current models are designed for different measuring areas and laboratory or shop-floor applications.  

Real-world SFM users also illustrate the workflow. Perfil Alumínio reports using the system to inspect multiple cavities faster and control more dimensions with less manual effort, while Tecnoglass uses predefined measurement plans and visual tolerance results during aluminium profile inspection.  

For an extrusion quality manager, the objective is ultimately simple: 

Measure more of the profile, understand deviations more clearly and turn inspection results into useful production information. 

Conclusion 

A modern profile measurement system does more than replace a caliper measurement with a digital number. 

Its real value comes from combining measurement, geometry, CAD comparison and inspection data into one quality-control workflow. 

For aluminium extrusion manufacturers, this can provide a much clearer picture of the product being produced. Instead of evaluating only a handful of individual dimensions, the quality team can inspect the cross-section as a complete geometric object, identify where deviations occur and preserve the results for later analysis. 

Manual measurement tools will continue to have an important place in extrusion plants. But when profile complexity, inspection volume or traceability requirements increase, automated 2D profile measurement provides an additional level of information that individual measurements cannot easily deliver. 

Sources: 

https://www.iso.org/standard/66777.html?utm_source=chatgpt.com 

https://knowledge.bsigroup.com/products/aluminium-and-aluminium-alloys-extruded-rod-bar-tube-and-profiles-profiles-tolerances-on-dimensions-and-form-2 

https://knowledge.bsigroup.com/products/aluminium-and-aluminium-alloys-extruded-precision-profiles-in-alloys-en-aw-6060-and-en-aw-6063-tolerances-on-dimensions-and-form-3

The latest major release of Scan Fit & Measure introduces a new generation of measurement capabilities designed to make profile inspection faster, easier, more reliable and more intelligent. 
 
Version 5 combines enhanced CAD and reverse engineering functionality with new AI-powered tools, simplified measurement workflows, improved standards support and significant enhancements to the Measurement Data Center (MDC). 
 
The result is a more automated and efficient workflow that helps operators move from scanning and profile preparation to measurement, evaluation, reporting and archiving with less manual effort. 

Key Highlights 

• Enhanced CAD import and automated contour extraction 

• AI Chips & Burrs Removal and a new AI Smart Assistant 

• Improved reverse engineering, Automatic Mirror & Fit and new measurement tools 

• Integrated ANSI H35.2 tolerances and expanded Measurement Data Center capabilities 

Together, these updates reduce repetitive manual work and simplify the way operators prepare, measure and evaluate scanned profiles. 

Enhanced CAD Import 

CAD drawings containing multiple contours can now be imported more easily. 

Instead of selecting each contour individually, the operator can draw a rectangular selection around the required area. All relevant contours inside the selected area are then included automatically. 

This is particularly useful for drawings with multiple contours, complex geometries or assemblies. It reduces the need to select contours one by one and helps shorten CAD preparation time before measurement begins. 

Automated Contour Extraction 

Contour extraction has been improved with automated parameter recognition. 

Scan Fit & Measure can automatically determine the appropriate parameters for contour extraction, reducing the amount of manual adjustment required from the operator. 

This makes profile preparation faster and more consistent while also simplifying the workflow for less experienced users. 

AI Chips & Burrs Removal 

Version 5 introduces new AI algorithms that automatically recognize chips, burrs and profile dust on the profile contour and remove them before measurement. 

This is especially useful when measuring profiles directly from production, where small imperfections can affect contour extraction and measurement results. 

By automatically removing unwanted elements, the functionality can reduce profile preparation time, improve contour quality and minimize the amount of manual cleaning required before measurement. Operators can therefore move from scanning to measurement faster and with less manual intervention. 

AI Smart Assistant 

A new AI Smart Assistant is now integrated directly into Scan Fit & Measure. 

Operators can ask questions in their own language, and the assistant provides answers in the same language. Because the assistant is available directly inside the measurement software, users do not need to leave the application to search for information. 

The AI Smart Assistant can help operators understand software functions, access assistance more quickly and reduce dependence on external manuals and documentation. It can also support the onboarding of new operators by making relevant information easier to access during everyday work. 

Improved Reverse Engineering 

The reverse engineering workflow has been enhanced to make the creation of usable geometry from scanned profiles faster and more automated. 

Improvements to contour recognition and geometry processing simplify the transition from a scanned profile to usable CAD geometry. 

The updated workflow reduces the need for manual geometry correction and makes it easier to prepare scanned profile geometry for further engineering work. 

Automatic Mirror & Fit 

Scan Fit & Measure can now automatically mirror the scanned profile when required and fit it to the CAD drawing. 

This removes manual mirroring and alignment steps that previously had to be performed by the operator. 

The functionality provides automatic orientation correction, faster CAD-to-profile alignment and a simpler measurement setup with less operator intervention. 

New Diameter & Radius Tools 

New Diameter and Radius measurement tools make these measurements easier to access and use. 

The enhanced functionality simplifies the measurement of circular and radial geometry and provides a more intuitive workflow when operators need to inspect these features. 

Smart Hollow Width 

Measuring hollow widths now requires fewer steps. 

The operator no longer needs to construct measurement points manually. Instead, the user can select the two sides of the hollow, and Scan Fit & Measure calculates the distance automatically. 

This makes hollow measurements faster, reduces operator interaction and simplifies the inspection of more complex hollow profiles. 

Integrated ANSI H35.2 Aluminium Extrusion Tolerances 

Version 5 integrates ANSI H35.2 requirements for aluminium extrusion tolerances directly into the measurement workflow. 

This allows users to work with standardized aluminium extrusion tolerances without relying only on separate external tolerance tables. 

The integration can make tolerance evaluation faster and simplify the verification of aluminium extrusion profiles during quality inspection. 

New Measurement Data Center Capabilities 

The latest release also introduces important enhancements to the Measurement Data Center (MDC). 

MDC provides centralized access to measurement results, reporting and quality data. Version 5 expands the ways users can evaluate, verify and archive their measurements. 

New Thermometer Evaluation 

A new thermometer-style evaluation provides a clear visual representation of measurement results relative to their tolerances. 

This helps operators and quality engineers identify deviations and understand measurement status more quickly. 

Remeasurement with Manual Instruments 

Measured values can now be remeasured and compared using manual measuring instruments. 

This provides an additional verification option when users need to compare scanner-based measurements with results obtained using traditional measurement tools. 

Improved Archiving 

Measurement files can now be archived together with the relevant profile images. 

This provides a more complete record of the inspection and makes historical measurement data easier to review later. 

Together, the New MDC Capabilities Support: 

• Clearer visualization of measurement results 

• Additional verification with manual instruments 

• More complete archived measurement records 

• Improved traceability and review of historical measurements 

These improvements make MDC more useful for both day-to-day result evaluation and long-term quality documentation. 

New Area Dimension / Record 

A new Area Dimension / Record has been added to the measurement functionality. 

Scan Fit & Measure can calculate and record the area of the measured profile, providing additional information for profile analysis and quality control. 

For example, profile area data can be useful where cross-sectional area is related to material consumption, weight calculations or other production parameters. 

Filtering Green and Red Dimensions in the Single Report Drawing 

Version 5 also introduces filtering of green and red dimensions in the single report drawing. 

This gives users another way to review reported dimensions according to their displayed measurement status and focus on the results that are most relevant during evaluation. 

A New Generation of Profile Measurement 

Version 5 brings improvements across several stages of the Scan Fit & Measure workflow, from CAD preparation and contour extraction to measurement, reverse engineering and result evaluation. 
 
The main direction of the release is clear: 

• Reduce repetitive manual work 

• Make profile preparation and measurement easier 

• Introduce more automation and AI-assisted functionality 

• Expand measurement evaluation and quality-control capabilities 

With these updates, Scan Fit & Measure Version 5 gives operators more tools to move efficiently from scanning and measurement to evaluation, reporting and archiving. 
 
The new release is designed to make profile inspection more intuitive, automated and efficient while providing additional capabilities for quality control, verification and long-term measurement data management. 

Measure Every Cavity. Compare Every Result. 

Multi-cavity extrusion dies allow several profiles to be produced during the same extrusion process. Maintaining consistent geometry across all cavities is essential for stable production and reliable product quality. 

With Scan Fit & Measure (SFM), manufacturers can perform multi-cavity inspection by inspecting several profiles from the same multi-cavity extrusion die in a single scan. Each profile is identified by its cavity number and measured individually against the nominal CAD drawing. 

This creates two levels of aluminium extrusion quality control: individual profile inspection and cavity-to-cavity analysis. 

Compare Each Extruded Profile with the CAD Drawing 

SFM compares the scanned geometry of each profile with its nominal CAD definition and evaluates the predefined dimensions and tolerances. 

This allows the quality team to identify: 

• dimensional deviations; 

• profile geometry deviations; 

• wall thickness variations; 

• form, position and orientation deviations; 

• out-of-tolerance dimensions; 

• differences between the actual profile and the nominal CAD geometry. 

The result is an immediate view of how each individual cavity performs against the required specification. This makes it easier to identify deviations in individual aluminium profiles before analysing how the cavities perform as a group. 

Compare the Cavities with Each Other 

Multi-cavity inspection does not stop with the comparison to the CAD drawing. 

Once the measurements are stored in the Measurement Data Center (MDC), the results from the different cavities can be analysed together. 

For example, profiles from a four-cavity extrusion die can be tracked as: 

Cavity 1 | Cavity 2 | Cavity 3 | Cavity 4 

The quality team can then compare the measurement results between cavities and identify whether one cavity consistently behaves differently from the others. 

MDC provides charts and statistical information for profiles and dimensions, including average, minimum, maximum, standard deviation, range and Cpk. This makes it possible to see not only whether a profile is within tolerance, but also how its measurements compare with profiles produced by the other cavities. 

The result is a clearer view of cavity-to-cavity variation and the overall performance of the multi-cavity extrusion die. 

From Individual Deviations to Production Trends 

A single profile measurement tells you whether that particular profile meets the specification. 

A series of measurements tells you much more. 

By analysing cavity-specific results in MDC, quality and production teams can identify: 

• systematic differences between cavities; 

• trends in dimensional variation; 

• cavities that consistently perform differently; 

• changes in critical dimensions over time; 

• increasing variation that may require attention; 

• differences in process stability between cavities. 

This turns multi-cavity inspection from a simple pass/fail check into a tool for extrusion process monitoring and continuous improvement. 

Instead of reacting only when a profile moves outside its tolerance limits, manufacturers can use the accumulated measurement data to understand how individual cavities behave over time. 

See the Difference — Don't Just Measure It 

For example, imagine four profiles produced by a four-cavity extrusion die. 

SFM can compare each profile against the same CAD drawing and show the deviations for each one. 

MDC can then bring those results together so the team can see the measurement data and statistical trends for the different cavities. 

Instead of asking only: 

“Is this profile within tolerance?” 

the quality team can also ask: 

“How does Cavity 3 perform compared with Cavities 1, 2 and 4?” 

and: 

“Is the difference between the cavities increasing over time?” 

This additional level of analysis can help aluminium extrusion manufacturers identify variation earlier and make better-informed decisions about the extrusion process and die performance. 

One Measurement Process. Two Levels of Insight. 

SFM provides the detailed inspection of each individual profile against its CAD drawing. 

MDC transforms those individual measurement results into comparable data, charts and statistics that reveal differences and trends between cavities. 

Together, they provide a complete approach to multi-cavity quality control in aluminium extrusion — from CAD-to-profile deviation to cavity-to-cavity comparison and process analysis.