Circular Conveyor vs Rotary Indexing Table

Circular Conveyor vs Rotary Indexing Table, What do you want to know?

Author: ShanGong| 17th, Sept 2026| Category: Circular Motion — Comparisons

These two look alike on a layout drawing — stations arranged around a circle, workpieces indexing between them — and they behave very differently.

A rotary indexing table is one rigid plate. Fixtures bolt to it, and the whole plate indexes as a unit. Station spacing is fixed by the bolt pattern, and the station count is fixed by the indexing mechanism.

A round circular conveyor is a track with independent carriers on it. The carriers are spaced by the drive element rather than by a plate, and the centre of the circle is empty.

Circular Conveyor vs Rotary Indexing Table: Where each one wins

Choose a rotary indexing table when

The process applies significant force to the workpiece. Pressing, riveting, staking, thread forming. A rigid plate on a large-diameter bearing reacts process force far better than any carrier-and-stop arrangement. This is the strongest argument for a table and it is often decisive on its own.

The diameter is small and the cycle is very fast. Under roughly 600 mm with a sub-second index, a cam indexer is hard to beat.

The station count is fixed and will not change. A table is a well-understood, low-part-count machine when the process is settled.

Choose a circular conveyor when

The centre of the circle is needed. A robot column, a feeder, a vision column, a control cabinet. On a table, that space is the table. This is the most common practical reason lines move across.

The diameter has to grow. Plate mass rises with the square of the radius, so a large table indexes slowly and needs a large drive. A track carries the same carriers whatever the diameter — increasing loop size changes the path, not the moving mass.

The station count may change. Adding carriers to a loop is a configuration change. Adding stations to a table is a new table.

The layout is not a circle. If the process eventually needs a longer run of stations, a loop can be oval or rectangular. A table cannot.

Carriers need independent handling. Loading or unloading a single carrier, or holding one station while others index, is available within a loop through individual cylinder positioning. On a table every position moves together, always.

The force question of Circular Conveyor vs Rotary Indexing Table

If the answer to “does the station press on the workpiece” is yes, ask how hard before going further. A circular conveyor holds the carrier against a positioning mechanism, and that mechanism has a limit to the process force it can react before the carrier is pushed off its datum. Where the force is significant, either the fixture must react it to the machine frame independently of the carrier, or a table is the better architecture.

We do not publish a maximum process force at the positioning mechanism, so this is confirmed per application at quotation. Send the magnitude and direction with the requirement — it is item 6 on the quotation list.

Accuracy in Circular Conveyor vs Rotary Indexing Table

A circular conveyor with a positioning mechanism repeats to ±0.03 mm on chain drive and ±0.05 mm on timing belt. A good cam indexer is comparable. Accuracy is rarely what separates these two — rigidity, centre access and scalability are.

Reacting process force without a table

A loop can take process force at a station, but the load path has to be designed rather than assumed.

The carrier is held on a positioning mechanism, and that mechanism reacts what the process pushes into it until the force exceeds what it can hold, at which point the carrier leaves its datum and the accuracy figure stops meaning anything. Three arrangements avoid that, in order of how much force they handle: keep the force low enough that the mechanism reacts it directly; support the fixture from the machine frame at the station, so the press load closes through the frame rather than through the carrier; or clamp the fixture to a backing structure at that station for the duration of the operation.

The second and third are ordinary machine design, and they are what makes a loop viable on lines that include one pressing or staking step among otherwise light operations. What they need is to be designed in at layout stage — retrofitting a backing structure under a station on a built loop means working around the frame, the drive and the guarding all at once.

Downtime looks different on each

A table concentrates its motion in one unit. The index drive is a single well-understood assembly, there is little else to wear, and when it does need attention the machine is down as a whole.

A loop distributes the same duty across rollers, a drive element, joints and positioning mechanisms. Individual items are replaceable, wear appears gradually and shows up as symptoms before it stops the line, and a spares holding is a handful of standard parts rather than an assembly.

Neither profile is inherently better, but they suit different maintenance organisations — one favours a plant that plans overhauls, the other a plant that inspects and replaces.

Related with Circular Conveyor vs Rotary Indexing Table

• Round Circular Conveyor — the loop layout closest to a table
• Circular Conveyor Systems
• Circular Conveyor vs Linear Conveyor

Frequently asked questions about Circular Conveyor vs Rotary Indexing Table

Can a loop go into the footprint a table occupies now?

Often, and usually with room to spare in one direction and less in another. A round loop of the same station circle is narrower in the middle and no wider at the edge, so the carriers fit where the plate was — but the drive, the positioning mechanisms and the frame sit outside the path, and on a cell that was built tight around a table that is where the interference appears. What normally makes the change worthwhile is the centre becoming available: a feeder, a robot column or a cabinet that had nowhere to stand now has the middle of the cell.

Why does a cam indexer index faster at small diameter?

Because the moving mass is small and the motion profile is mechanical. At a modest diameter the plate and its fixtures have little inertia, and the cam profile accelerates and decelerates them through a shaped curve with no settling to wait for. A loop at the same diameter is moving carriers that each have their own mass against a drive element and then engaging a positioning mechanism, which takes time the cam does not spend. As diameter grows the comparison reverses, because plate mass rises with the square of the radius while the carriers on a track do not change.

We have one staking station and seven light ones. Does that rule out a loop?

No, but it decides how the station is built. Send the force magnitude and direction with the requirement and it is assessed against the positioning mechanism; where it exceeds what the mechanism should carry, the station is designed with the fixture supported from the frame during the operation, so the load does not pass through the carrier. This is a common arrangement. What is not workable is a loop where several stations all apply significant force — at that point the table’s rigidity is doing real work and the architecture should follow it.

Which is easier to change over to a different product?

A loop, in most cases, because the nests come off the carriers and the station positions do not move. A table’s fixtures are on the bolt pattern, so a change either reuses the same positions or needs a new plate. Where the new product changes the number of operations, the difference is larger again: a loop absorbs it by changing which positions have stations, while a table’s station count is fixed by the index mechanism.

Can the two be used together?

Yes, and it is a sensible arrangement when one operation is force-heavy and the rest are not. The loop carries the product through the light stations, and a small indexing table or a fixed press station handles the heavy one, with a transfer between them. That keeps the rigidity where the process needs it without making the whole line pay for it in centre access and scalability.

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