SIASUN SR270A-220/3.21 (SR270A-220/3.21)

On a factory floor, distance costs precision. The further an arm extends, the more every gearbox, joint and motor is tested by the mass hanging from the flange, and the harder it becomes to set a heavy part down exactly where the last one went. The SIASUN SR270A-220/3.21 is engineered for that strain. It is a floor-mounted industrial robot that pairs a 220 kg (485 lbs) payload with a 3218mm reach and a repeatability of ±0.06mm, so long-reach work need not mean loose tolerances.

Robots Middle East sells the SIASUN SR270A-220/3.21 and supplies it to manufacturers, system integrators and engineering facilities across the Middle East. Our team prepares each quotation around the application you describe, arranges delivery to your site and remains your point of contact for support once the robot enters service.

Background

SIASUN and its engineering record

SIASUN brings over two decades of engineering validation and thousands of project experiences to its industrial robots. The company presents its work as a combination of robot products and application services, rather than the supply of hardware alone. That emphasis matters for a machine of this class, because a heavy-payload robot is rarely bought on its own: it arrives as the centre of a cell that includes tooling, fixtures, guarding and a production sequence built around it. The SR270A family, which includes this version and the SIASUN SR270A-270/2.70 (SR270A-270/2.70), sits within the manufacturer's Large Payload range.

Rigidity, motion planning and a purpose-built wrist

Three design decisions define this robot. First, the J5 axis uses a backlash-free gearbox design, and all joints use rigid connections to minimise vibration at high speed. Second, the controller logic applies NURBS interpolation together with variable velocity and acceleration planning, which allows the hardware to be driven closer to its full performance and makes operation more efficient. Third, the wrist is driven by a custom motor that delivers strong torque and meets the demands of high-inertia applications, where large or awkwardly shaped tools and workpieces resist every change of direction.

Technical Specifications

Specifications are as published by the manufacturer and are confirmed against the datasheet at quotation.

The manufacturer has not published the power supply, the controller model, the operating temperature, any mounting orientation other than floor, the package contents or the certifications for this model; these are confirmed at quotation.

How does the SR270A-220/3.21 hold its accuracy at full reach?

A long arm magnifies small faults. Any play in a gearbox near the wrist, or any flex in a joint, becomes a larger positional error at the end of the tool, and that error grows with speed as the arm starts and stops. SIASUN addresses this at its source. The backlash-free gearbox on the J5 axis removes the slack that would otherwise let the wrist wander, while rigid connections throughout the joints keep the structure stiff enough to suppress vibration when the robot moves quickly.

Mechanics are only half the answer. NURBS interpolation describes the tool path as smooth curves rather than a chain of short straight segments, and variable velocity and acceleration planning shapes how the arm speeds up and slows down along that path. Together they reduce the abrupt changes that excite vibration in a heavy structure, which is how the robot can work efficiently without trading away its ±0.06mm repeatability. The 1380kg body, set on the floor, provides the stable base this approach depends on.

Why is the wrist sealed more tightly than the body?

The wrist is where a robot meets the process. It sits closest to coolant, spatter, dust and washdown, and it is the part most likely to be exposed when the arm reaches into a machine or over a conveyor. SIASUN rates the wrist at IP67 and the body at IP54. Under the IP system, the first rating denotes protection that is dust-tight and resistant to temporary immersion, while the second denotes protection against dust ingress that would impair operation and against splashing water. In practice, that places the stronger protection exactly where contamination is most concentrated, while the body is protected to a level suited to general industrial surroundings. Buyers planning cells with heavy coolant use or frequent cleaning should discuss the full environment with us so that the layout keeps the body within its rating.

Who is the SIASUN SR270A-220/3.21 for?

This robot suits plants that must move heavy parts across a wide working area and still place them consistently. Automotive and transport manufacturers handling body components, castings or subassemblies fit that description, as do metalworking shops tending large machine tools and producers of building materials or heavy goods who palletise dense loads. System integrators designing large cells across the region will find the combination of payload, reach and floor installation a practical foundation for layouts where one robot must serve several stations.

It is less suited to compact cells where floor space is tight, or to tasks where floor installation does not match the planned layout. Where your project calls for a different balance of payload and reach, we recommend comparing it with its family sibling, the SIASUN SR270A-270/2.70 (SR270A-270/2.70), and with other heavy-duty models such as the SIASUN SR220A-220/2.66 (SR220A-220/2.66) and the SIASUN SR360A-280/3.20 (SR360A-280/3.20). The wider range is gathered under Industrial Robots.

What is the SIASUN SR270A-220/3.21 used for?

1. Heavy part handling — moving large components between conveyors, fixtures and storage across a broad working envelope.
2. Machine tending — loading and unloading large machine tools, where reach into the machine and consistent placement both matter.
3. Palletising and depalletising — stacking dense, heavy loads at the end of a production line.
4. Spot welding — carrying heavy welding guns in body shops, where the high-inertia wrist motor helps with rapid repositioning.
5. Foundry and casting handling — transferring castings in dusty surroundings, with the IP67 wrist closest to the process.
6. Press line transfer — moving sheet parts and blanks between presses in heavy forming operations.

Pricing and Availability

Robots Middle East quotes the SIASUN SR270A-220/3.21 for each project individually, because the right configuration depends on your application, tooling and site. Tell us what the robot must lift, where it must reach and how your cell is arranged, and we will prepare a quotation that reflects those requirements. Delivery, customs clearance and after-sales support are arranged together with the quotation. A request for a formal quotation is available on this page.

Frequently Asked Questions

What payload can the SIASUN SR270A-220/3.21 handle?

The robot carries a payload of 220 kg (485 lbs). That capacity covers the combined mass of the tooling and the workpiece, so both should be considered when planning a cell.

How far can the robot reach?

The reach is 3218mm. This allows one floor-mounted robot to serve a wide area, such as several fixtures or a large machine tool opening.

How repeatable is its positioning?

The repeatability is ±0.06mm. The backlash-free J5 gearbox, rigid joint connections and NURBS-based motion planning all contribute to holding that consistency at speed.

How is the robot installed?

The robot is designed for floor installation. Robots Middle East helps plan the cell layout and foundation around that arrangement.

Is it suitable for dusty or wet environments?

The wrist is rated IP67 and the body IP54. The wrist therefore carries the stronger protection, and we advise reviewing your environment with us so that the body remains within its rating.

Which industries is it suited to?

It suits automotive, metalworking, foundry and heavy-goods production, where large parts must be moved and placed consistently. System integrators building large multi-station cells are also a natural fit.

Where can I buy the SIASUN SR270A-220/3.21 and what does it cost?

You can buy the SIASUN SR270A-220/3.21 from Robots Middle East, which supplies it across the Middle East. The cost depends on your configuration and project scope, so we provide it in a formal quotation prepared on request.

Summary

The SIASUN SR270A-220/3.21 answers the problem set out at the start: how to reach far with a heavy load without letting accuracy slip. Its answer combines a 220 kg (485 lbs) payload, a 3218mm reach and ±0.06mm repeatability with a backlash-free J5 gearbox, rigid joints, smooth NURBS-based motion planning and a custom wrist motor built for high inertia. An IP67 wrist places the strongest protection where the process is harshest. For manufacturers and integrators in the Middle East planning a large, demanding cell with Robots Middle East, this page is the starting point.