Visible burr inspection on metal parts
Vision can assess a burr when the unwanted edge feature is visible with enough contrast and image detail. A raised feature may remain inside the silhouette.
// Short answer
Burr inspection with machine vision looks for unwanted visible material at specified edges or hole mouths after machining or deburring. Backlighting can reveal a protruding outline; directional lighting can expose an edge that blends into the surface. Oil droplets and attached chips must be included in the validation samples because they can resemble burrs. Hidden internal edges and burrs below the validated visibility limit need another inspection method.
// At a glance
The station in three lines
- Inspection point
- After the operation that creates the visible feature; before it is hidden.
- Release
- PLC quality hold or confirmed rejection, defined for this line.
- Validation
- Your good, faulty and borderline production samples.
// Fit & limits
What this station will not do, and what it needs
What it will not do
- Internal edges Blind intersections and occluded surfaces are outside a direct view.
- Functional consequences Images do not measure burr attachment force, fatigue strength or downstream sealing behaviour.
- Universal detection The smallest unacceptable defect must be demonstrated on actual samples, not inferred from pixels alone.
What makes it work
- Edge specification Mark critical edges and acceptable edge breaks on the drawing.
- Real variation Include burrs, clean good edges, oil, loose chips and tool-mark variation.
- Rework rule State whether cleaning, deburring and reinspection are allowed.
// On South African lines
Inspect visible burrs after machining and deburring: where the check belongs
A deburring operation changes an edge, but a shiny edge is not automatically a good edge. Specify which edge zones matter and how the unacceptable condition is defined by the drawing or customer standard. Decide whether loose chips trigger cleaning and reinspection or immediate quarantine. Imaging before cleaning may be useful for process feedback, but it is a different condition from inspection after washing and drying. The station must be validated at the point where it will actually operate.
This is an engineering scope for sample assessment, not a report of a completed customer installation. The sources below support measurement, imaging or test-method principles; station performance must be established on your products.
What the line reports, and what the station checks
| What the line reports | What a station checks | Where it stops |
|---|---|---|
| A burr remains on an outside edge | Inspect the silhouette against a controlled background | The edge must be exposed to the camera and light. |
| A hole mouth has residual material | Use directional illumination and a located inspection region | The camera cannot see around an internal corner. |
| Oil droplets cause alarms | Include oily good parts in the reference and challenge sets | Do not raise the threshold until real burrs disappear. |
| Loose chips look like attached burrs | Define a clean-and-reinspect route or quarantine both | An image may not reliably distinguish attachment strength. |
// The complete solution
Hardware, software and installation
[Schematic]Plan view, not to scale
Swipe sideways to see the whole drawing →
[1]: Trigger
[2]: Lighting
[3]: Image
[4]: Hold / reject
[5]: Confirm
Hardware
| Component | HIKROBOT example | Role in this station |
|---|---|---|
| Imaging | HIKROBOT area-scan camera with suitable optics | Resolve the specified edge and its surrounding reference region. |
| Backlight | Uniform transmitted light | Expose protrusions on accessible outlines. |
| Surface light | Low-angle illumination with controlled shielding | Test whether the critical relief remains visible over production variation. |
| Handling | Part fixture and controlled presentation | Keep the inspected edge visible without covering it with the fixture. |
Software and vision tools
| Tool or software | What it does here |
|---|---|
| Edge location | Find the edge from the component datum rather than a fixed image coordinate. |
| Defect decision | Compare edge shape or classify approved defect categories; retain uncertain cases. |
| Recipe control | Bind edge zones and limits to the part revision. |
| Evidence | Save the failing zone with the part/cycle reference for rework. |
Installation and integration
01
Define the inspection contract
Agree the defect/feature list, acceptable variants, reference samples, failure response and excluded checks.
02
Establish optical access
Mark critical edges and acceptable edge breaks on the drawing. Include burrs, clean good edges, oil, loose chips and tool-mark variation.
03
Connect the quality decision
State whether cleaning, deburring and reinspection are allowed. A result is valid only for its own part or pack cycle.
04
Control changes
Bind the program and inspection limits to the authorised product revision; record who changes them.
05
Commission on the real line
Repeat the challenge set under the agreed production conditions, then check cleaning, restart, bypass and rework handling.
// Budget and scope
What determines the station quotation
The optical test and integration survey define the scope before a rand budget is issued.
No numerical budget is assigned to this scope before optical feasibility and the handling/PLC requirements are defined. A shared camera model or similar product does not establish the cost of this complete station.
| Cost driver | What changes the scope | Information needed |
|---|---|---|
| Visibility | Number of critical edges and views | Marked drawing and defect samples |
| Preparation | Cleaning/drying and permitted residue | Production-condition samples |
| Validation | Defect classes and borderline judgement | Customer edge acceptance criteria |
Compare the scope with the cost guide. The quotation states its price date, VAT treatment, installation, commissioning and exclusions.
// Related technology
Which technologies this scenario uses, and why
The technologies behind this station, how much each matters here, and where each is explained in depth.
| Technology | Role | Why it matters in this scenario | Read more |
|---|---|---|---|
| Surface defect detection | Core | Supports the machined part burr inspection task within the stated viewing and acceptance limits. | Surface defect detection |
| Lighting technique | Core | Supports the machined part burr inspection task within the stated viewing and acceptance limits. | Machine vision lighting |
| Area scan cameras with a vision controller | Supporting | Supports the machined part burr inspection task within the stated viewing and acceptance limits. | Camera and lens selection |
| PLC link and reject with confirmation | Supporting | Supports the machined part burr inspection task within the stated viewing and acceptance limits. | PLC and reject integration |
// Acceptance
How the station is proven before handover
Every station is accepted on your products, against numbers agreed in writing before the build. How we deliver →
01
Defect classes
Report missed burrs and false alarms separately for each critical edge and sample condition.
02
Presentation
Rotate/reload parts within allowed tolerances and include fixture contamination.
03
Reinspection
Prove that a cleaned or reworked component receives a new result and cannot inherit a previous pass.
04
Evidence and handover
Record the challenge set, outcomes, recipe revision, inspection conditions and unresolved limits. Agree false-reject and missed-defect targets before building; no universal performance figure is assumed.
// FAQ
Questions about this station
What samples are needed for this inspection?
Mark critical edges and acceptable edge breaks on the drawing. Include burrs, clean good edges, oil, loose chips and tool-mark variation. Include acceptable production variation and borderline failures, not only ideal parts.
Can the camera cover every defect?
Blind intersections and occluded surfaces are outside a direct view. Images do not measure burr attachment force, fatigue strength or downstream sealing behaviour. The agreed scope lists what is visible and what needs another method.
Can this be integrated into an existing line?
Assess optical access, available space, triggers, PLC signals and a safe physical hold or reject route first. The scope covers a new inspection station; it does not assume repair or takeover of an existing third-party vision system.
How is the station price established?
The sample study defines views and optics; the site survey defines handling, enclosure, PLC integration and validation. The quotation states the rand amount, price date, VAT treatment and exclusions. No transferable fixed price is implied.
Sources
- NI: A practical guide to machine vision lighting (Lighting principles cited in the site lighting guide, checked 24 September 2026. Application depends on material and viewing geometry.)
- HIKROBOT VisionMaster (Vendor tool scope, verified 25 September 2026 in the source ledger. Tool availability is not proof of performance on your products.)
- Bluewrist: Burr Check (Vendor example of burr inspection, read 26 October 2026; not an addaScan installation or performance claim.)
Related:
More line solutions in automotive and engineering:
// Next step
Send us your products and the fault you want caught
Describe the line, the products and the fault. We test on your good and faulty samples and reply with a feasibility note and a budget.