1. Pre-orient the flow
Track geometry encourages parts into a smaller number of stable attitudes before the final validation feature.
Orientation question
How do bowl feeders reject and recirculate parts?
See how tooling validates part attitude, removes unsuitable presentations and returns rejected parts without contaminating the accepted flow.
Direct answer
Reject tooling separates the accepted attitude from every wrong one
A vibratory bowl feeder normally uses component-specific tooling to preserve acceptable orientations and cause wrong ones to lose support, be redirected or return to the bowl. Rejected parts then recirculate for another pass. The reject route is part of the design: it must remain clear, avoid disturbing accepted parts and not subject components to unacceptable repeated contact.
2. Validate a usable feature
A rail, slot, guide, ledge or other tooling feature distinguishes the accepted attitude from an unacceptable one.
3. Return rejected parts
Parts that lose support or are diverted should fall back through a clear route and re-enter the bulk flow without blocking accepted parts.
| Reject approach | How it can work | What must be checked |
|---|---|---|
| Loss of support | The wrong attitude cannot remain on a rail or ledge and falls back. | Normal good-part variation must not be rejected. |
| Mechanical guide or wiper | A feature turns, separates or removes an unsuitable attitude. | Clearance, wear, marking and access for cleaning. |
| Profile slot or gauge | Geometry allows only a defined feature or attitude to continue. | Burrs, flash, tolerance and overlapping parts. |
| Air assistance where appropriate | A controlled air action redirects a recognised wrong attitude. | Utilities, noise, contamination, part movement and reliable timing. |
| Sensor-controlled reject near handover | A detected fault triggers a controlled diversion or stop. | Sensor suitability, confirmation and recovery logic. |
Buyer questions
Questions about this decision
These answers define the limits and evidence that should be agreed before the feeder is finalised.
Does every incorrectly oriented part need an air jet?
No. Many orientations can be rejected by gravity and mechanical tooling. Air assistance may be useful for a particular component or decision point, but it introduces utility, timing, noise and control considerations and should be justified by testing.
Can rejected parts damage acceptable parts when they return?
They can if the return path creates excessive drop, impact, congestion or repeated circulation. The trial should observe part condition, landing position and the number of recirculation passes, especially for cosmetic, fragile or decorated components.
How is excessive recirculation identified during a trial?
Observe the proportion of parts that pass each orientation point, the time parts remain in the system, repeated reject traffic and any build-up at the return. A feeder may show movement but still have poor usable output if most parts circulate repeatedly.
What happens if a rejected part cannot return freely?
A blocked or poorly directed return can create piles, re-enter the accepted stream, interfere with tooling or starve the track entrance. The reject route should be treated as a designed flow path and tested at representative bowl loading.
Related guidance
Continue the specification
Use the most relevant product and guide pages, then send the application evidence to Lancing.
Review the orientation and reject route
Provide representative samples, the accepted orientation, target demand, discharge datum and downstream-machine details.