Rotary Sorter vs. Conveyor Belt Inspection
Choosing between a rotary vision sorter and a conveyor belt inspection machine is the first and most consequential decision in any vision inspection project. The wrong choice means either overspending on capability you do not need, or being stuck with a machine that cannot handle your parts. This guide breaks down the decision by transport mechanism, cycle time, part geometry, and cost.
How Each Machine Moves Parts Past the Cameras
A rotary sorter uses a precision-engineered turntable with pockets or nests that carry each part past multiple camera stations. The part is held in a fixed orientation, so cameras see the same surface every time. The turntable rotates continuously, meaning inspection happens in motion, at speeds of 300 to 1,500 parts per minute depending on part size and camera count.
A conveyor belt inspection machine uses a belt transport system where parts move in a linear path past camera stations. Parts can be placed manually, fed by vibratory bowl, or indexed by a servo-driven belt. The belt can handle larger, heavier, or awkwardly shaped parts that do not fit in rotary pockets. Speeds typically range from 100 to 500 parts per minute.
When to Choose Rotary
Rotary is the right choice when your parts are small, relatively uniform in shape, and produced at high volume. Fasteners, screws, nuts, rivets, small stampings, and precision-machined components are ideal rotary candidates. The turntable holds each part in a consistent orientation, enabling full 360-degree inspection without stopping.
The strengths of rotary are speed and consistency. Because every part passes the same camera positions in the same orientation, you get uniform image quality and repeatable measurements. The trade-off is that rotary pockets are sized for specific part dimensions, so a large change in product mix may require new tooling.
When to Choose Conveyor Belt
Conveyor belt inspection is the right choice when your parts are large, heavy, irregularly shaped, or need inspection on multiple surfaces that cannot be captured in a single rotary pass. Plastic housings, electronic assemblies, machined brackets, medical device components, and automotive parts all benefit from belt transport.
The strengths of conveyor are flexibility and part size range. A single belt can handle parts from 20mm to 300mm without tooling changes. Dual-lane configurations let you inspect two parts simultaneously. The trade-off is lower throughput per lane and potential orientation variability that requires more sophisticated camera setups.
Quick Decision Matrix
Use this summary to narrow your choice, then confirm with a sample evaluation:
Choose Rotary if: parts under 50mm, high volume (500+ per minute), consistent shape, need 360-degree inspection, fastener or precision hardware. Choose Conveyor Belt if: parts over 50mm, lower volume (100-500 per minute), variable shapes, need top and bottom inspection, housings or assemblies. Choose Custom if: parts over 200mm, mixed product lines on one machine, special handling requirements, or integration with existing production equipment.
When in doubt, send us your part samples. Our application engineers will run them on both machine types and give you a data-backed recommendation with throughput estimates and defect detection rates for your specific parts.
Key Takeaways
✓Rotary = speed and consistency for small, uniform parts at high volume (500-1500/min)
✓Conveyor belt = flexibility for large, heavy, or irregular parts (100-500/min)
✓Custom = for parts over 200mm or mixed product lines needing special handling
✓Always confirm with sample evaluation before committing to a machine type