Snap ring presence detection for every retaining ring, bore, and shaft.
FlexIPS verifies that each snap ring or circlip is present, fully seated, and correctly oriented before the assembly leaves the station. Every groove is checked against the active recipe, failed grooves are shown to the operator, and the final verdict is stored against the serial.
classified as present, missing, proud, or wrong-orientation before release
station stays locked until each retaining ring passes the recipe
typical full-assembly inspection with serial-linked evidence
Rings
4
Seating
·
Cycle
< 100 ms
Remove a snap ring. Watch vision respond.
This is a live simulation of a FlexIPS snap-ring inspection station. Click any bore to make its ring missing or wrong orientation, hit Seed defects for a quick scenario, then run a scan. The detection boxes, confidence, and verdict update exactly like they do on the line.
Rings
4 / 4 OK
Defects
0
Confidence
0.99
Try it: remove a snap ring
Click any bore to cycle it: present → missing → wrong orientation. Then run a scan.
Detection results
PASSBuilt for the defects manual checks miss.
Snap rings are thin, reflective, and often partly hidden by chamfers, oil, or adjacent parts. FlexIPS treats every groove as its own inspection target so a small seating error cannot be averaged away by the rest of the assembly.
Release logic
PASS is only released when all defined grooves meet the active recipe. A single missing, proud, backwards, duplicate, or wrong-size ring keeps the station in controlled FAIL until rework is confirmed.
Presence in the correct groove
Confirm each circlip or retaining ring is installed in the expected bore or shaft groove, with no skipped ring positions.
Seating height and proud rings
Detect rings sitting above the groove, cocked rings, and half-seated rings before the next component hides the defect.
Orientation and ring side
Check tapered, stamped, or asymmetric rings for the correct face and orientation where the part design requires it.
Variant, duplicate, and wrong ring
Use barcode-loaded recipes to catch wrong-size rings, doubled rings, and variant mix-ups on high-mix stations.
Missing, half-seated, or correct, classified on every groove.
An assembly is only as reliable as its weakest snap ring. FlexIPS inspects each groove individually, catching the rings that walk out, sit proud, or were never installed at all.
Missing rings
- Ring not assembled or fully absent from the groove
- Ring lost between stations during transfer
- Operator skipped the ring-install step in manual assembly
- Ring blown off by air eject or cleaning before the check
- Feeder ran out of rings mid-batch (empty-batch escape)
Half-seated & wrong
- Ring sitting proud of the groove, not fully seated
- Ring cocked or tilted across the groove instead of seated flat
- Ring installed backwards (wrong orientation) on tapered rings
- Wrong-size ring loaded into the groove
- Duplicate / double ring stacked in one groove
Correctly seated
- Ring fully seated in the correct groove
- Ring oriented correctly (no backwards installation)
- No foreign material (swarf, chips) trapped under the ring
- Right ring variant for the work order
- Ready to release, with minimal risk of the retained part walking out
What a PASS looks like vs a FAIL.
Each reference case below shows the captured image, the detection overlay, and the verdict the station would issue. These are the exact cases FlexIPS is trained to separate.
All snap rings present and seated
Every groove contains a ring, fully seated, correct orientation. Confidence is high and the station releases the assembly to the next operation automatically.
Missing snap ring in one groove
The middle groove has no ring detected. The assembly routes to FlexCheck with the empty groove highlighted and the action REWORK shown to the operator.
Wrong-orientation snap ring
A tapered ring is installed backwards. The station flags the orientation, routes to FlexCheck, and labels the action CHECK so the operator can flip and re-seat it.
Half-seated / proud snap ring
The ring is present but sits proud of the groove instead of seated flat. FlexIPS detects the offset and routes the assembly to rework before the next operation.
Not just detected. Contained, corrected, and proven.
The inspection result becomes part of the station sequence. Operators see the exact failed groove, the PLC receives a clear state, and quality teams keep the evidence needed for containment, audits, and warranty investigations.
Station sequence
PASS gated- 1Barcode or part-present trigger loads the exact housing, shaft, and groove recipe
- 2Controlled lighting separates the thin ring edge from oil, chamfer, and groove shadow
- 3PLC pass/fail handshake blocks the station until the failed groove is corrected
- 4Retest-after-rework confirms the same serial reaches PASS before it advances
- 5Images, overlays, confidence, operator action, and final verdict remain searchable later
One snap-ring engine, every assembly.
Wherever a snap ring retains a part, in a bore, on a shaft, or inside a sealed housing, a missing or mis-seated ring is a risk. FlexIPS verifies it before that risk reaches the customer.
Transmission & Gear Housings
Verify every internal circlip is seated in its bore before the next gear or shaft is dropped in, preventing catastrophic disassembly in the field.
Shaft & Bearing Assemblies
Confirm external circlips on shafts are present and seated before a bearing is pressed, to catch the ring that holds the bearing in place.
Brake & Wheel Hubs
Inspect retaining rings in brake calipers, hubs, and bearing packs before the assembly is sealed; a missing ring here is a safety defect.
Engine & Pump Assemblies
Verify snap rings in oil pumps, water pumps, and engine housings are seated, preventing leaks, pressure loss, and warranty claims.
Actuators & Motors
Check retaining rings in electric actuators, rotor assemblies, and stepper motors before the unit is closed and shipped.
High-Mix Sub-Assemblies
Inspect rings across many housing variants from a single station; no-code recipes swap automatically with the work order.
Precise, no-code, and line-paced.
Per-Groove Classification
Every groove on the part is individually classified ring present, missing, or wrong orientation, with its position, state, and confidence.
Re-Tested, Line-Paced
The whole assembly (even many bores and grooves) is inspected and re-tested every cycle until PASS within the station cycle. Never the bottleneck.
Release-Gated
The station cannot complete until every ring is confirmed present and seated, protecting the next operation and the end customer.
Evidence Per Groove
A calibrated image is stored for the assembly, so the quality team can prove exactly which ring was or was not seated in its groove.
FAIL Routing to FlexCheck
A missing or wrong ring routes the assembly to FlexCheck with the affected groove highlighted and the action to take clearly labeled.
No-Code Recipes
Define the grooves, ring types, and tolerances visually, with no vision expertise needed. Variants swap automatically with the work order.
Every ring, every groove, tied to the serial.
Snap-ring inspection is not just a pass/fail light. Each groove, its ring state, the captured image, the confidence, and the verdict are stored against the serial, so you can prove the state of every ring on any unit, any time.
Serial-linked proof
Every ring result, image, confidence, and verdict is tied to the serial and searchable in FlexDashboard for any assembly, any time.
Prevent field escapes
A missing or half-seated ring is caught before the part ships, never discovered later as a field failure or warranty claim.
Audit-ready
Prove every snap ring was present and seated on every unit shipped, exportable for audits, PPAP, and containment.
Ring missing in Bore B
No ring detected in groove
Ring wrong orientation in Bore C
Tapered ring installed backwards
When a ring is missing or mis-seated, the operator sees exactly which groove and why.
If any groove fails (missing, half-seated, or wrong orientation) the assembly is routed to FlexCheck. The failed groove is highlighted on the stored image, labeled with the defect, and paired with the action to take: rework, check, or controlled override.
- Every groove classified present, missing, or wrong-orientation individually
- Failed grooves highlighted directly on the captured image
- Ring state and position shown per failed groove
- Clear action label per failure: REWORK, CHECK, or Override PASS
- Every decision logged against the serial for traceability
From trigger to traced verdict in one paced cycle.
Step 1
Trigger
Part-present signal or barcode read starts the cycle and loads the matching snap-ring recipe for that housing or shaft variant.
Step 2
Capture
Calibrated images of each bore and groove are grabbed with controlled lighting so the thin snap ring is clearly separated from the groove edge.
Step 3
Detect
Each groove is classified as ring present, missing, or wrong orientation, with its position and a confidence score.
Step 4
Decide
Release PASS to advance the assembly, or route FAIL to FlexCheck showing exactly which groove is missing or mis-seated and where.
Drops into any station.
FlexIPS bridges IT and OT without middleware, from part-present sensors and PLC handshakes to MES genealogy records.
Sensors & PLC I/O
Trigger on part-present, handshake with the station, and return pass/fail to the line PLC with 24V logic - station-lock on any missing or mis-seated ring.
MES & Traceability
Serial, variant, every groove result, image, confidence, and verdict written to your MES or SQL store, with full genealogy tied to each assembly shipped.
Line-Paced Cycle
The full assembly (many bores and grooves) is inspected and re-tested every cycle until PASS within the station cycle, calibrated to keep pace with the line and never become the bottleneck.
Common questions from assembly and quality teams.
Verifying retaining rings are present, seated, and oriented, answered for production and quality teams.
What is snap ring presence detection?
Snap ring presence detection is a machine vision inspection that verifies whether a retaining ring (snap ring) is correctly seated in its groove before an assembly advances. A single image confirms each ring is present, fully seated, and correctly oriented, catching missing rings, half-seated rings, and rings installed backwards before they cause field failures.
Can machine vision tell if a snap ring is fully seated in the groove?
Yes. With calibrated optics and controlled lighting, FlexIPS resolves the thin profile of a snap ring against the edge of its groove, distinguishing a ring fully seated in the groove from one that is missing, half-seated, or sitting proud of the groove. Each result carries a confidence score and is stored against the serial.
How fast is snap ring inspection?
A full assembly (even with many bores and grooves across a single part) is inspected and re-tested every cycle until PASS within the station cycle, typically well under one second, so the check keeps pace with the line and never becomes the bottleneck.
Does it detect wrong-orientation snap rings?
Yes. Snap rings with an obvious inside/outside or tapered face can be checked for correct orientation, flagging rings installed backwards. Missing rings, half-seated rings, and duplicate rings are also detected, with the affected groove highlighted in FlexCheck review.
Which snap rings and retaining rings can be inspected?
Any externally or internally visible snap ring: internal circlips in bores, external circlips on shafts, E-rings, constant-section rings, and spiral rings. Recipes are no-code and swap automatically with the work order, making it easy to inspect housings, gear assemblies, pumps, and transmissions.
What happens when a snap ring is missing or half-seated?
The station returns a FAIL and routes the part to FlexCheck, where the affected groove is highlighted on the captured image with the defect labeled (missing, half-seated, wrong orientation). The operator sees exactly which groove and why, and the review decision is logged against the serial for traceability.
Why is snap ring inspection important?
A missing or unseated snap ring lets a retained component walk out of position under load, causing catastrophic failures in gearboxes, hubs, pumps, and transmissions. Because the ring is small and the groove is thin, a half-seated ring is easy to miss by eye; machine vision catches it reliably, every unit, before the assembly advances.
Can FlexIPS inspect internal circlips and external shaft rings?
Yes. FlexIPS supports internal circlips in bores, external snap rings on shafts, E-rings, spiral rings, and other visible retaining rings. The inspection recipe defines the expected groove position, ring geometry, acceptable seating window, and any orientation rule for each variant.
Can the inspection handle oily, dark, or reflective snap rings?
Yes, when the station is configured with the right optics and lighting. FlexIPS uses controlled illumination and calibrated regions of interest to separate the ring edge from groove shadows, machining marks, oil film, and reflective metal surfaces.
Does the station integrate with PLCs and MES systems?
Yes. The inspection can trigger from sensors, barcodes, or the PLC, then return pass/fail, failed-groove details, and station-lock signals. Serial, recipe, image, confidence, operator action, and verdict can be written to MES, SQL, REST, OPC UA, or FlexDashboard depending on the line architecture.
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Test FlexIPS on your snap-ring assembly
Send a sample assembly, a drawing of the grooves, or a work instruction and we will map a tailored demo around your ring types, groove geometry, and traceability requirements.