Round Circular Conveyor

A round circular conveyor is a single continuous 360° ring with independent carriers running on it. There are no straight sections and no arcs to join — the loop is one closed circle, and every station sits on the same radius.

It is the most compact closed-loop layout available, and it is the one most often confused with a rotary indexing table. The difference matters: on an indexing table the stations are fixed to a plate and all move together. On a round circular conveyor each carrier runs on a track and can be spaced, positioned and — on some configurations — stopped independently.

Where the Round Circular Conveyor fits

Specify a round loop when floor space is the binding constraint, when the process is short enough to fit around one circle, or when a central column, feeder or robot occupies the middle of the cell and the carriers need to circulate around it.

Specify an oval or rectangular loop instead when the station count exceeds what the circumference comfortably holds, or when process equipment needs to approach the carrier square-on — on a round loop every station approaches on a radius.

Configuration of TallMan Round Circular Conveyor

A full 360° ring is supplied as a single piece, which removes segment joints from the loop entirely. On a segmented loop the cut-face tolerances accumulate around a closed path with no free end to absorb them; a one-piece ring has none. Where the diameter allows it, this is a real accuracy advantage over any segmented layout.

Toothed ring drive

Round loops are the layout where a toothed ring rail makes most sense, because there is no straight section for a conventional drive wheel to work against. The pinion meshes with teeth cut into the rail itself, so there is no belt to stretch and no chain to take up, and the relationship between motor rotation and carrier position is fixed by gear geometry at every point of the ring.

Toothed ring rails are supplied with external teeth — drive outside the ring — or internal teeth — drive inside it. The choice is normally settled by what occupies the centre of the cell.

Standard toothed rings are 23 mm guideway width, which places this option on lighter, higher-precision lines. Detail on Toothed Circular Guide Rail.

What limits the station count

A round loop has one length available to it and no way to add more without growing in both directions, so the station list is checked against the ring before anything else is settled.

Clearance decides it rather than the rail. Outside the ring, adjacent tooling has to stand side by side without its guarding and services overlapping — a robot and a press at neighbouring positions need more separation than their tool centres suggest. Inside the ring everything converges, so a fixture that projects inboard takes a larger share of the inner circle at a small diameter than the drawing implies.

Where the list will not fit, the choices are a larger ring, moving a station off the loop into a feed or an outfeed, or an oval layout that buys length on the straights without widening the machine. Send the station list with the tooling envelopes and the diameter comes back selected against them.

Every station approaches on a radius

On a straight run, tooling comes down onto a carrier that is square to the rail and stays square. On a ring, each station sits at its own angle around the circle, so either the tooling is built to that angle or the fixture presents the workpiece the same way at every position.

It usually resolves in one of two ways. Fixtures are built with the working face pointing radially outward, which makes every station identical seen from its own position. Or the stations that need a square approach — a robot with a fixed tool orientation, a camera on a linear slide — are grouped so the tooling has to be built at two or three angles rather than eight.

Settle it before the fixtures are designed. Changing a fixture’s orientation after the tooling is built is more disruptive than moving a station.

Performance of Round Circular Conveyor System

Payload is quoted per carrier against fixture geometry. On a round loop every point of the path is curved, so the inertial reaction a carrier experiences is present continuously rather than only at the ends — which makes fixture height and offset more significant here than on a layout with long straight runs.

Engineering data

• Circular Guide Rail Selection
• Toothed Circular Guide Rail
• Conveyor Slide Load Calculation

Enquiries about Round Circular Conveyor System

Send fixture envelope and weight, station count, required cycle time, and what occupies the centre of the cell — that last one usually decides internal or external drive.

Frequently asked questions about TallMan Round Circular Conveyor

How many stations will fit around a ring of a given diameter?

Fewer than the rail length suggests, because clearance rather than pitch is what runs out. Tooling standing outside the ring needs room for its guarding and services, and anything projecting inboard competes for an inner circle that gets tight quickly at small diameters. The useful way to ask the question is the other way round: send the station list with the tooling envelopes, and the layout comes back with the diameter already chosen against them.

Should the toothed ring have external or internal teeth?

Whatever occupies the middle of the cell decides it. If the centre holds a robot column, a feeder or a control cabinet, the drive cannot be in there with it and the ring is supplied with external teeth. If the centre is free and the outside of the ring is crowded with process stations, internal teeth put the drive where nothing else wants to be. The mesh behaves the same either way — the choice is about access, for the motor and for whoever services it.

Is the ring always supplied in one piece?

Up to 1000 mm diameter it is standard and comes as one piece, which is where the accuracy argument for a round loop comes from: there are no cut faces anywhere on a closed path. Larger rings are supplied as non-standard, and above the size that can be produced and shipped whole a ring becomes a segmented assembly that behaves like any other jointed loop. The one-piece advantage is therefore a property of the diameter range rather than of the round layout itself. Tell us the diameter you want and we will say which side of that line it falls on.

Can a round loop run vertically?

Yes, and the load case is different from a horizontal ring rather than simply reduced. Around a vertical ring each carrier passes through every orientation relative to gravity in one revolution — supported from below at the bottom, hanging at the top, loaded sideways through the sides. Fixtures have to retain the workpiece positively rather than rest it in a nest, and the drive holds the loop against the unbalanced weight of the carriers on one side. Vertical rings are supplied; the sizing is confirmed per line rather than carried across from the horizontal figures.

How do air and power reach a fixture on a moving carrier?

As standard they do not. Carriers are mechanical, and the usual arrangement is that anything powered acts from the frame at the station — the tooling clamps, and the carrier simply presents the workpiece. Where the fixture itself has to hold pressure or carry a sensor around the loop, it is engineered per line, and on a round layout that is harder than on an oval because there is no straight run for a cable chain to follow. Raise it at enquiry rather than after the layout is fixed.

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