VQC optical quality inspection system
OPTICAL DIMENSIONAL INSPECTION

Sheet metal inspection.From CAD to report.

Scan flat parts and check profiles, holes and positions against CAD.

2DFull contour
CAD → PDFNominal to report
Non-contactOptical capture
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Numbers that matter.

Optical measurement accuracy±(30 + L/50) µmMPEE · L is the measured length in mm
Inspection method2DProfiles, holes and local geometry in a single view
Digital inspection workflowCAD → PDFFrom nominal geometry to traceable results
VQC vs. static imaging

Same part. Same reading.
Anywhere on the table.

We measured the same parts at different positions with VQC and with a static imaging system. VQC's readings stayed put. The static system's drifted out of tolerance.

VQCScanning, telecentric optics
Static imagingOne camera image of the whole part
Spacing on a telecom part623.40 ± 0.30 mm · measured at 2 positions
0.05mmdifference between positions
0.65mmdifference between positions
Hole on a medical partØ 2.7 ± 0.3 mm · measured at 3 positions
0.00mm2.88 mm at every position
0.24mmfrom 2.930 to 3.165 mm
Readings within toleranceall 5 readings above
5/ 5within tolerance
2/ 5within tolerance
See all readingsWhy telecentric optics matter
Actual telecom sheet metal sample from the comparison
01 / Telecom sheet metal part

Within tolerance at both positions.

Raised features on both sides · Uneven sheet

Required spacing: 623.40 ± 0.30 mm
Part positionVQC mmStatic imaging mm
Centre623.39Within tolerance623.634Within tolerance
Left623.44Within tolerance624.282Out of tolerance

VQC: both positions within tolerance. Static imaging: one reading outside tolerance.

Actual medical instrument sheet metal sample from the comparison
02 / Medical instrument sheet metal part

One hole. Three matching readings.

Required hole diameter: Ø 2.7 ± 0.3 mm
Part positionVQC mmStatic imaging mm
Left2.88Within tolerance3.048Out of tolerance
Right2.88Within tolerance3.165Out of tolerance
Centre2.88Within tolerance2.930Within tolerance

VQC: 2.88 mm at all three positions. Static imaging: two readings outside tolerance.

Historical comparison from 2016 material: one telecom and one medical sheet metal sample, the dimensions and positions shown. Results apply to these samples only. Your part can be assessed in a sample inspection.

Watch it scan.

VQC / 3D machine view3D VIEW
VQC optical quality inspection system
Simulation · Illustrative dataPart positioned on support blocks
0%
Drag to orbit · Scroll to zoom · Arrow keys to orbit · + / − to zoomIllustrative part · Simulated data
3D illustrates the capture of 2D contours. Machine configuration depends on the agreed specification.
HOW IT WORKS

Four steps. One operator.

VQC_NT / Actual software interface
Actual VQC software screen: Load CAD
01 / 04

Load CAD

Select the matching CAD / DXF drawing or inspection plan. Nominal geometry and tolerances become the reference for the inspection.

INSPECTION OPTIONS

What VQC can inspect.

Profiles, holes and dimensions, shown in real inspection results.

VQC_NT Recorded inspection results
Sample result · Nominal and measured dimensions View full image
Sample result · Nominal and measured dimensions

Profile comparison

Compare the measured outline with CAD to locate deviations, extra cuts or missing cuts.

Read the result: compare the nominal value with the measured value, then check the deviation against the tolerance for that dimension.

  • Complex outlines
  • Local contour deviations
VQC_NT Actual inspection plan
Interface detail · Hole diameter review View full image
Interface detail · Hole diameter review

Hole diameters

Measure circular hole diameters against nominal dimensions and tolerances to check for oversize or undersize holes.

Read the result: compare the nominal value with the measured value, then check the deviation against the tolerance for that dimension.

  • Circular hole diameters
  • Dimensional deviations
VQC_NT Actual inspection plan
Actual interface · Dimensions and results View full image
Actual interface · Dimensions and results

Hole positions and spacing

Check centre-to-centre and hole-to-edge distances to identify positional deviations that may affect assembly.

Read the result: compare the nominal value with the measured value, then check the deviation against the tolerance for that dimension.

  • Centre-to-centre distance
  • Hole-to-edge distance
VQC_NT Recorded inspection results
Drawing annotations · Not measured values View full image
Drawing annotations · Not measured values

Angles and radii

The image shows nominal angle and radius annotations from the drawing, not measured results. Confirm the required checks with your drawing and a sample.

  • Angle measurement
  • Arc radius
WHY VQC

Built for real sheet metal parts.

See machining deviations

Compare measured profiles and dimensions with CAD to find the areas that need review.

Assess your actual parts

See the spacing results for a sample with raised features on both sides, tested at two positions.

Keep inspection evidence

Review nominal values, tolerances, measured values and deviations, then create an inspection report.

Raised or warped parts: suitability depends on height, visible contours and required tolerances. Confirm with a sample inspection.

See the sample results →
TRY IT

Nominal accuracy for your part length

Nominal accuracy (MPEE)±40 µm

MPEE ±(30 + L/50) µm, with L in mm. Confirm the specification for your configuration.

Why a telecentric lens?

An ordinary lens looks at the plate edge at an angle: the thicker the plate and the farther from the lens axis, the more the edge appears to move. A telecentric lens looks straight down along parallel rays.

Ordinary lens · apparent edge shift
751 µm
Telecentric lens (ideal) · shift
0 µm

Illustration, not measured data: ordinary lens assumed 2 m above the table; ideal telecentric optics.

PARTS & APPLICATIONS

Built for flat parts.

Inspect profiles, hole positions and 2D dimensions on opaque flat parts.

Discuss your part ↗
Illustrative flat sheet metal parts with varied profiles, circular holes and elongated slotsIllustrative example
Laser-cut partsPunched / blanked partsWaterjet-cut parts

Common questions.

Which parts can VQC inspect?

VQC checks profiles, hole positions and related dimensions on opaque flat parts. The workflow shown here does not inspect 3D surfaces, thickness or surface defects.

How do we assess inspection time and investment value?

Compare the full loading, scanning, review and reporting cycle using representative parts, alongside your inspection volume and current process.

What should we prepare for a part evaluation?

Bring a representative part, CAD / DXF drawing and key tolerances. Tell us which checks take the most effort.

LET’S MAKE QUALITY VISIBLE.

See VQC on your part.

Start with your part type and inspection challenge. With your drawing and key tolerances, we can discuss suitable checks and a sample demonstration.

Discuss your part ↗
DTMT Hangzhou Co., Ltd.[email protected] ↗+86 138 5712 4185 ↗For a detailed assessment: part size · CAD / DXF · key tolerances
Discuss your part