Casting U-Type 300-500kg Two Axis Welding Positioner 50mm Hollow Shaft for Robot

Casting U-Type Two Axis Welding Positioner with Hollow Shaft

The GBS-02-U series is a casting U-type two axis positioner for parts that need to be rotated around a horizontal axis while the robot welds both sides. Its U-shaped cast frame supports a Φ500mm T-slot table that tilts ±115° and rotates ±360°, and the 50mm hollow shaft lets welding cable, air lines and sensor leads pass through the centre of rotation instead of looping outside the fixture. Payload classes are 300kg and 500kg, repeatability is ±0.06mm at the table edge, and the drive is configured as a robot external axis with 1.5kW or 2.5kW motors on 380V three-phase power. Compared with a welded frame, the cast structure damps the vibration that appears when a heavy part is tilted quickly, which is why this 300-500kg hollow shaft turntable is often specified for pump bodies, valve housings and gearbox shells where wall thickness varies and porosity must be avoided.

Technical Specifications

Why the U-Type Cast Frame Works

• Cable protection: the 50mm hollow shaft keeps torch cables inside the axis, removing the loop that snags on fixtures.
• Symmetrical support: two side supports share the load, so a 500kg part stays rigid during tilt.
• Damping: the cast body limits the ringing that causes arc instability on thin-wall parts.
• Two axis reach: ±115° tilt with ±360° rotation presents almost any face of a box-shaped part to the torch.
• Robot integration: axis motion is programmed with the robot path, so coordinated moves keep the torch angle constant.

Typical Applications

• Pump bodies, valve housings and gearbox shells
• Hydraulic cylinder and manifold welding
• Frames and brackets requiring welds on four sides
• Stainless tanks and fittings with internal cable routing needs
• Rebuild and repair welding of cast parts

Frequently Asked Questions

Q: What is the hollow shaft used for on a 300-500kg hollow shaft turntable?
It routes the welding cable, gas hose and sensor wiring through the centre of the rotating axis. The cable turns with the table instead of wrapping around it, which extends cable life and avoids snagging during ±360° rotation.

Q: How do I choose between 1.5kW and 2.5kW drive power?
Drive power follows payload, table overhang and the required cycle time. The 1.5kW version suits 300kg parts at moderate speed; the 2.5kW version is specified for 500kg loads or shorter indexing times.

Q: Can the casting U-type two axis positioner run as a standalone unit?
It is designed as a robot external axis, but a standalone control cabinet can be supplied for manual or PLC operation if the cell has no spare axis channel.

Q: What is included in the delivery?
Positioner, drive package, T-slot table, documentation and test record. Fixture plates, special table sizes and extended tilt angles are engineered to order.

Production and Support

Gongboshi Robot Technology builds positioners and robot external axes in Shanghai and has served aerospace, nuclear, chemical, automotive and new-energy projects since 2016 with more than 100 engineers. Cast frames are inspected on receipt, machined after stress relief and assembled with preloaded rotary bearings; each unit is run in under load before packing. Standard models ship in 20-35 working days with a 12-month warranty, and our application team will confirm fixture interfaces for your robot external axis welding positioner before production.