Industrial · Aug 2026
Tube Cage Tolerance Inspection with On-Site 3D Scanning
Bent-tube cage hoops clamped in a fixture were 3D scanned at a fab shop to verify their tolerances, without unclamping or moving the assembly.
3D Scanning Inspection
3D scanning inspection: see where your part differs from CAD
A deviation map shows, in color, where a fabricated part, weldment or fixture departs from its CAD model and by how much. We scan the part, align it to your model the way it's actually located, and hand back color maps with measured callouts at the features you care about. It's engineering verification for builders who need answers before the next weld or the next batch, not a certified lab report.
What you get
What sets our work apart
Check the whole part, not a few points
Calipers and a height gauge check a handful of locations. A scan comparison checks every surface the scan captured, so twist, bow and drift show up even where nobody thought to measure.
Catch problems before they're welded in
Scanning tube assemblies on the fixture table, before final welding, lets you correct a hoop or a tab while it is still cheap to fix.
Numbers your team can act on
Color maps come with callouts at the features you name, such as hole positions, mounting faces and tube locations, so you know what to move and by how much.
A record of what was built
An as-built scan documents the part as it left the shop, ready to compare against later after wear, damage or a repair.
Process
How the work runs
Gather the reference
Send the CAD model (STEP is ideal), the tolerances that matter and how the part is located in use. No CAD? We can compare against a scan of a known-good part instead.
Scan the part
We scan it in our Reno shop or right on your fixture table. Large frames and cages get a target layout that keeps the whole assembly in one consistent coordinate system.
Align to your datums
The scan is aligned the way the part is actually held: to datum faces, holes or mounting points, or a best fit when no datums are defined. Alignment changes the answer, so we always tell you which method we used.
Compare and measure
Software measures the distance from every scanned point to the CAD surface and colors it by deviation. We add callouts, cross-sections and feature measurements where you need numbers.
Report
You get the color maps and measurements as images and a summary PDF, with a plain-English note on what falls inside your tolerance and what doesn't.
Typical jobs
Where it pays off
Weldments and tube assemblies on the fixture
Check roll-cage hoops, frames and subframes against the design while they are still on the fixture. We have scanned bent-tube cage hoops on a fixture table for exactly this.
Fixture and jig verification
Confirm that a new or well-used fixture still holds parts where the CAD says it should, before it builds a batch of parts that will not fit.
First parts off a new setup
Compare the first parts from a new fixture, tool or process with the design to see where they're moving before production ramps up.
As-built documentation
Record a finished chassis, frame or installation as built, so later changes, repairs and copies start from accurate data.
Wear and damage comparison
Scan a worn or damaged part and compare it with the CAD model, or with a scan of a new one, to see where material is gone and how much.
Distortion after welding or machining
Heat and released stress move parts. A before-and-after scan shows how much a part distorted and where.
Proof
3D Scanning Inspection projects
Automotive · Jul 2025
Tacoma Solid-Axle Swap: Full Scan, CAD Design and Build
A 1st-gen Tacoma was 3D scanned from frame to floorpan, then a front solid axle and rear 4-link were designed on the scan and the rear 4-link was built.
FAQ
3D Scanning Inspection questions
What is a scan-to-CAD comparison?
It's an inspection where a 3D scan of the real part is overlaid on its CAD model and every scanned point is measured against the design. The result is a color map showing where the part is high, low or on target.
How accurate is 3D scanning inspection?
The scanner specification is accuracy up to 0.03 mm (0.0012 in), and what you get on a real part depends on its size, surface and setup. It's a strong fit for fabricated parts, weldments and fixtures. Send us your tightest tolerance and we'll tell you honestly whether scanning is the right check.
Do you offer certified first-article inspection?
No. We provide engineering inspection, not certified first-article inspection, and we don't issue traceable calibration certificates. If your customer requires a certified report, use an accredited lab; we're a good fit for the checks that come before that.
Can you inspect a part while it is still on the fixture?
Yes. On the fixture table is often the most useful time to check, because problems can still be corrected before final welding.
What do I need to send for an inspection?
The CAD model, ideally as a STEP file, the tolerances that matter and a note on how the part is located. If there's no CAD, we can compare against a scan of a known-good part.
Can you compare a worn part to the original?
Yes. We compare the worn part's scan with the CAD model or with a scan of a new part, and the deviation map shows exactly where material has worn away.
Guides
Further reading
Guides · 5 min read
How to Prepare a Part or Vehicle for 3D Scanning
How to prepare for 3D scanning: clean the part, clear loose items, flag critical features, plan for targets and spray, and prep vehicles, sites and shipments.
Technology · 5 min read
Blue Laser vs. Structured Light 3D Scanning
Blue laser vs. structured light 3D scanners: how each captures data, where each works best, what accuracy and resolution specs mean, and how we pick per job.
Technology · 6 min read
STL vs. STEP: Which 3D Scan Deliverable Do You Need?
STL vs. STEP for 3D scan deliverables: what a mesh is, what CAD is, a side-by-side table, and which file you need for printing, machining, molding or design.
More services
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