ACTION + COMPONENT VERIFICATION

Manual Assembly Verification to Confirm Every Action and Part

NAGARE supports manual assembly verification by checking configured operator actions and visible components together. Picks and placements are compared with the approved workflow, so a recognised mismatch can be flagged at the station. Hidden work and ambiguous views require further checks or operator review.

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Trusted by manufacturers for error-free manual operations

THE PROBLEM

Checking the Part Alone Misses How It Got There

End-of-line vision sees the finished product. It cannot see a part fitted and removed, a component placed twice or an action done out of view, and each of those can leave a defect that a final image misses.

Hidden Once Covered

Bearings, seals and clips disappear under the next layer. A final check sees the cover, not what went in beneath it.

Actions Leave No Trace

A greasing or pressing action may leave little visible evidence once covered. Observing the action supports process checking. It does not by itself prove lubricant quantity, seating depth or force.

Repeats Look Like Success

Two parts placed where one belongs can look correct from above, until the unit fails in test or in service.
The Solution

Verify the Action and the Component Together

Our AI process monitoring software, NAGARE™, supports manual assembly verification by recognising configured visible actions and components as work happens. The agreed record captures those observations. Physical acceptance criteria and any unit-identifier connections are defined during scoping.

Recognise What the Operator Does

  • Follow hands as they pick, place and press
  • Detect missed and repeated actions
  • Cover work done out of the main view with a second camera
  • Run on-premise for fast, private processing
Every action
Recognised live
On-premise
Processing at the line
Conceptual illustration of an operator fitting a perimeter gasket to an open housing beneath an overhead camera.

Confirm Which Part Went Where

  • Check the component against the variant's part list
  • Confirm position and orientation at placement
  • Catch a part before the next layer covers it
  • Store the action and part record for each unit
Per unit
Action and part record
Before covering
Hidden parts confirmed
HOW IT WORKS

How Action and Part Checks Combine

Manual assembly verification works best when the camera sees both the hands and the product. NAGARE pairs action recognition with part recognition and checks both against the approved method.

Official video frame showing an engine-bearing assembly view with tracked parts and cycle status
Engine-bearing assembly application: one view checks bearing selection while another follows placement into the engine block.
Highlight #1

Set Up One or Two Views

A top view sees the product and bins, and a second angle covers areas the hands hide during fitting.

Highlight #2

Recognise Actions and Parts

Models trained on your cycles identify each pick, placement and press, and the component involved.

Highlight #3

Flag and Record

A missed, repeated or wrong placement raises an alert at once, and the unit's record is saved with its clips.

Connect With Us

Send a video of one station and the part list for its variants. We will show which actions and parts can be verified.

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How Build Checks Compare at the Station

Each approach confirms something about the build. The difference is whether it sees the work as it happens or only the result.

Monitoring need
Manual methods
Traditional machine vision
NAGARE AI
What is checked
Finished unit, by eye
Finished unit, by image
Each action and part, live
Hidden components
Missed once covered
Missed once covered
Confirmed before covering
Part placed twice
Rarely noticed
Seen only if visible at the end
Flagged when it happens
First-Time-Right
Varies by inspector
Good for visible features
Errors corrected during the build

Frequently Asked Questions

How does a camera tell what the operator is doing?

Action recognition uses video models to identify what a person is doing, such as reaching, picking, placing or pressing, frame by frame. In assembly, it turns a stream of operator actions into a timeline that can be compared with the approved method. Research on manual work has used depth cameras and skeleton tracking for this, while current systems also work well from standard video. The model is trained on cycles from your own station, so it learns your parts, tools and the way your operators hold them.

Why check actions as well as parts?

Many operations become hard to inspect after the next layer covers them. Watching a configured pressing, greasing or seating action can provide process evidence before that happens. It does not, by itself, establish full seating, sufficient lubricant or the required force. Checking visible parts and operator actions together therefore supports manual assembly verification, while tools, sensors or functional tests retain the physical-result checks that the camera cannot demonstrate. Define both kinds of acceptance criteria for the station.

How does it notice a part placed twice?

For placements visible in the validated camera view, configured rules can count the recognised actions into a position. If a second part goes where only one belongs, or the same action is done twice when the method calls for once, the station flags it. A repeated placement is easy to miss by eye because the result can look normal from above, which is why it is better caught at the moment it happens.

What does the engine bearing example show?

In the bearing assembly video, two camera views watch bearing selection and fitting on an engine block. Each bearing placement is checked against the expected position, and incorrect, missed or repeated placements are flagged to the operator in real time. Processing runs on edge AI hardware on the premises, so video does not need to leave the plant. The example informs assessment of similar stations. It does not establish identical coverage for every part, view or assembly method.

How is the right component confirmed for each variant?

Define the expected parts for the selected variant using its bill of materials or work instruction. Component verification can then be assessed against visible shape, colour and markings. A work-order or BOM connection must be agreed rather than assumed. Where parts look identical, a barcode scan or controlled bin assignment may supply identity evidence, while the camera checks the visible placement. Validate misstocked bins and hidden features too. A correct pick location alone does not prove the component's identity.

Can it verify pick and place at a sub-assembly bench?

Yes. The same approach confirms that the right item was taken from the right bin and put in the right location, whether that location is a tray, a fixture or a partly built unit. Benches that prepare sub-assemblies for the main line benefit most, because an error caught there never reaches the line. Where an identifier connection is configured, recognised placements can be recorded against that unit or tray. Confirm the record and coverage in the trial.

What if the operator's hands hide the part?

Hands can hide the part at the moment of fitting. A second camera view or a part presence check after the hands move away may resolve some cases. Hand-object interaction tracking provides observations of the visible motion. It does not prove an unseen final placement. Test representative occlusions and define which cases need another view, a tool or sensor signal, or operator review. Leave an ambiguous action unconfirmed rather than assuming that it was completed correctly.

What should we send to plan manual assembly verification?

Send a video of the station across several cycles, the part lists for each variant and examples of defects found later in the line. Mark the steps that leave no visible trace. With that, we can propose camera views, the actions and parts to verify first, and how alerts and unit records should work at the station.

CONNECT WITH OUR EXPERTS

Show Us the Station Where Parts Go Missing

Share a station video, part lists and the defects that reach test. We will plan manual assembly verification for that station and explain timing and cost. Plan on about 4 weeks from kickoff to a working station.

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