Dimensional Inspection Services UK

Deviation reports & first article inspection

Surface Scan’s dimensional inspection verifies your part against its CAD with metrology-grade 3D scanning, accurate to 0.020 mm. You get measurement evidence you can put in front of an auditor, a customer, or a regulator.

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How to prove your part is in spec

You need documented proof, not a verbal "it looks fine"

An auditor, a customer, or a regulator wants evidence they can check. A pass or fail on its own does not settle it. You need a report that shows exactly where the part sits against the drawing, in a format you can hand over and defend later.

Conventional tools cannot reach the geometry you have

Calipers and point-by-point probing are good on simple prismatic features. Freeform surfaces, thin walls, complex castings, large assemblies and delicate parts sit outside what they capture cleanly. You need the whole surface measured, not a handful of points.

You need to know whether what was made matches what was designed

A fabricated, machined or printed part is back from the supplier or off the shop floor, and it has to be verified against the nominal CAD before it goes into service. Looking at it is not the same as measuring it.

HOW IT WORKS

3D scanning for dimensional inspection

Surface Scan inspects parts by capturing the full surface with metrology-grade 3D scanning, aligning the scan to your nominal CAD, and reporting exactly where the part deviates from the design.

Because scanning is non-contact and captures the whole surface, it records millions of points across the part rather than the small number of points a touch probe can reach. That suits freeform surfaces, complex castings, thin-walled and delicate parts, and assemblies that have to be measured where they sit. Every scan is aligned to a world coordinate system as standard.

Capture the part

Align to your nominal CAD

Issue the report you need

WHAT YOU GET

Which inspection report do you need?

Surface Scan produces the inspection report that matches your requirement, all generated from a single full-surface scan. Here is what each report gives you.

Deviation analysis (colour map)

Your scan overlaid on the CAD and colour-mapped, so anything outside tolerance shows up at a glance. The fastest way to see how a whole part compares to its design.

GD&T analysis

Geometric dimensioning and tolerancing checked against the drawing: position, flatness, profile, concentricity and the rest, reported feature by feature.

First article inspection (FAI) report

Verification of the first parts off a new or changed process, before you commit to a full run. See the detail below.

Comparative analysis

Part against master, or part against part across a batch, to confirm consistency between units or against a known-good reference.

Scan-to-CAD alignment

A best-fit alignment of the scan to your nominal model, with the reference points and datums set up the way your drawing calls for them.

Deformation analysis

How a part has moved, warped or worn: under load, over time, or after a heat or finishing process. Scan it now, scan it later, see what changed.

What is a first article inspection?

A first article inspection (FAI) checks that the first parts off a new or changed manufacturing process match the engineering drawing before full production begins. If that part is a newly developed product still being taken from concept to production-ready design, our product design and development service covers that earlier stage. Surface Scan produces first article inspection reports from full-surface 3D scan data: every feature checked against the nominal CAD, with a deviation map and GD&T results, in a report you can hand to your customer or auditor. If you work to a specific format, tell us what you need and we will talk it through before we start.

REAL PROJECTS

What does dimensional inspection look like in practice?

A deviation colour map: the scanned part overlaid on its CAD, with green where the part is on-nominal and warmer colours where it drifts outside tolerance.

Medical & Research — Imperial College London

Measuring delicate prosthetics for medical research

A research team at Imperial College London needed precise, non-destructive measurement of hyper-realistic prosthetic body parts for a medical study. We mounted each delicate prosthetic in a custom jig, captured a full 360-degree pass with the NimbleTrack, and merged the passes into a single, dimensionally consistent dataset. The team got accurate geometry for analysis without the originals ever being at risk.

Media Production — CPL Films

Capturing van roof geometry on site

CPL Films needed exact roof measurements to design a bespoke solar rig. We scanned the full roof profile and every mounting point with the NimbleTrack, then processed the data into a parametric CAD file with the key reference points built in. They got dimensions they could design straight from, and a file they can reuse for the next modification without re-scanning.

Need a part verified?

Send us the part or book an on-site scan. We align it to your CAD and return the report format you need. We reply within one working day.

CMM comparison

3D scanning inspection vs CMM: which suits your part?

A coordinate measuring machine (CMM) measures individual points with a touch probe, while 3D scanning captures the whole surface without contact. Each suits different parts:

A CMM gives very high single-point accuracy and suits prismatic features and tight individual dimensions, but it is slow and struggles with freeform surfaces, large or installed parts, and delicate items a probe should not touch.
3D scanning records the full surface in millions of points, quickly and without contact, so it fits complex geometry, full-surface deviation maps, large or on-site assemblies, and anything that cannot be clamped onto a CMM bed.
Surface Scan inspects with optical 3D scanning, so we do not run a CMM. Where touch-probe point accuracy is genuinely the priority for your part, a CMM bureau may be the better route, and we will tell you so.

	CMM (touch probe)	3D scanning inspection (Surface Scan)
Measurement coverage	Individual points	Full surface, millions of points
Complex or freeform geometry	Limited	✓ Ideal
Large or installed parts	Limited (fixed bed)	✓ Yes, scanned on-site at full accuracy
Delicate, soft or finished parts	Risk of contact	✓ Non-contact
Speed for full-surface capture	Slow	✓ Fast
Single-point accuracy on prismatic features	Highest	0.020 to 0.050 mm
Full-surface deviation colour map	Limited	✓
GD&T and first article inspection reports	✓	✓

Accuracy & equipment

How accurate is Surface Scan's dimensional inspection?

Surface Scan’s dimensional inspection is accurate to 0.020 to 0.050 mm, measured with the Scanology NimbleTrack, a Red Dot Award winner with 0.020 mm resolution. Because it is portable, that accuracy holds on large parts and installed machinery scanned in place. For whole environments or very long-range work, such as a full production line, the FARO Focus extends the reach. Every scan is aligned to a world coordinate system as standard, and our scanning equipment is calibrated by a third party.

Scanology NimbleTrack, our primary inspection scanner.

FARO Focus, for large environments and long-range scans.

Equipment	Accuracy	Resolution	Range	Best for
Scanology NimbleTrack (Red Dot Award)	0.020–0.050 mm	0.020 mm	3.5 m	Parts, components, assemblies, large machinery, freeform surfaces
FARO Focus	2–4 mm	—	up to 70 m	Buildings, whole sites, long-range capture (e.g. a full production line)

Who We Work With

Where does dimensional inspection matter most?

We inspect parts across industries, from a single machined component to a full installed assembly. The report formats stay the same; what changes is what you are verifying and to whose specification.

Aerospace & defence

First article inspection and conformance verification on machined and fabricated components.

Automotive & motorsport

Verifying fabricated, cast and machined parts against CAD, plus fit and clearance checks on assemblies.

Marine

Verifying cast, machined and fabricated marine components against CAD, from fittings and brackets to propeller and drive parts.

Manufacturing & engineering

First-off and batch verification, supplier-part checks, and tooling or fixture validation.

Medical & research

Non-contact measurement of complex, delicate or organic geometry, like the Imperial College prosthetics study.

Construction & infrastructure

As-built verification of buildings, structures and sites, scanned on site with the FARO Focus.

What Our Clients Say

145+ five-star Google reviews

Frequently Asked Questions

Dimensional inspection — your questions answered

What is a dimensional inspection?

A dimensional inspection verifies that a physical part's dimensions and geometry match its design specification. Surface Scan does this with full-surface 3D scanning aligned to your nominal CAD, then reports the result as a deviation map, a GD&T analysis, or a first article inspection report. It is how you prove a part is within tolerance before it ships or goes into service.

How accurate is your dimensional inspection?

Measurement accuracy comes from the Scanology NimbleTrack, which works to 0.020 to 0.050 mm with 0.020 mm resolution. Because it is portable, the NimbleTrack holds that accuracy on large parts and machinery too, scanned in place. For whole environments or very long-range work, such as a full production line, the FARO Focus reaches up to 70 metres at 2 to 4 mm. Every scan is aligned to a world coordinate system as standard, so results are repeatable.

What is a first article inspection?

A first article inspection (FAI) verifies the first parts off a new or changed manufacturing process against the engineering drawing, before full production. Surface Scan produces FAI reports from full-surface scan data, with every feature checked against the nominal CAD and the result shown as a deviation map and GD&T results you can hand to a customer or auditor.

What's the difference between 3D scanning inspection and a CMM?

A CMM measures individual points with a touch probe at very high single-point accuracy, which suits prismatic features. 3D scanning captures the full surface, millions of points, without contact, which suits freeform geometry, large or installed parts, and delicate items. Surface Scan inspects by scanning. Where touch-probe point accuracy is the priority, we will say a CMM bureau is the better route.

Is your inspection equipment calibrated?

Yes. Surface Scan's scanning equipment is calibrated by a third party, and every scan is aligned to a world coordinate system as standard. The measurement accuracy comes from the Scanology NimbleTrack at 0.020 to 0.050 mm. If your audit needs a specific calibration standard, tell us up front and we will confirm what we can provide before you commit.

What report formats do you produce?

Deviation analysis (colour maps), GD&T analysis, first article inspection reports, comparative analysis, scan-to-CAD alignment, and deformation analysis. All of them come from a single full-surface scan, so you can take more than one report from the same inspection. Tell us the format your customer or auditor expects and we will match it.

How much does dimensional inspection cost?

Inspection is priced like our scanning work. Scanning starts from £70, with CAD and any extra report deliverables, such as GD&T or first article inspection, quoted on top. Cost depends on the part's size and complexity and the reports you need, so the most accurate answer comes from a quick look at the part. Send the details and we will give you a clear quote.

What do you need from me to inspect a part?

The part itself, posted to us, dropped off, or scanned on site. The nominal CAD model and your tolerances help, since we align the scan to them, but we can work from the part alone and advise on datums and reference points. If you have a drawing rather than a CAD file, send that too.

Can you inspect large or installed assemblies on site?

Yes. The NimbleTrack is portable, so we scan large parts and installed machinery on-site at full accuracy, anywhere in the UK. For whole environments or very long-range jobs, such as a full production line or a building, we use the FARO Focus, which trades some accuracy for reach.

What happens if my part is out of spec?

This is where being one supplier helps. If inspection shows a part is out of tolerance, the same Surface Scan workshop can reverse-engineer and remanufacture a corrected version, rather than sending you off to find a separate maker. See part recovery & replacement and reverse engineering for how that works.

Tell us what you need verified

Send the part details or your CAD, tell us the report format you need, and we will come back within one working day with a quote and a turnaround.

What happens next:

We review your part and brief

We confirm the method, the report format, and the price

You decide whether to proceed

Get your inspection quote

We reply within one working day. No obligation.