The Precision Hollow Rotary Platform is a highly integrated actuator engineered for multi-station automated indexing tables. Its core design philosophy lies in the monolithic integration of a precision gear reduction mechanism and a high-rigidity cross-roller bearing.
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HOLLOW ROTARY PLATFORMS
An Arc-Second Actuation Unit Integrating Precision Transmission and High-Rigidity Slewing Bearings
Integrated Transmission & Support: The reduction mechanism and cross-roller bearing are deeply integrated, allowing payloads to be bolted directly onto the output table, eliminating independent bearing housings and couplings.
Versatile Drive Multi-Pulses: Available in Worm Gear, Spiral Bevel Gear, and Hypoid Gear configurations to precisely match distinct operating conditions such as self-locking, heavy load, and low noise.
Arc-Second Precision Indexing: Repetitive positioning accuracy within ≤±10 arcsec with a full-series design lifespan of 20,000 hours.
Product Overview
The Precision Hollow Rotary Platform is a highly integrated actuator engineered for multi-station automated indexing tables. Its core design philosophy lies in the monolithic integration of a precision gear reduction mechanism and a high-rigidity cross-roller bearing.
The Precision Hollow Rotary Platform is a highly integrated actuator engineered for multi-station automated indexing tables. Its core design philosophy lies in the monolithic integration of a precision gear reduction mechanism and a high-rigidity cross-roller bearing.
By mounting the payload directly onto the output rotating table, this Hollow Rotating Platform integrates rotary transmission and bearing support into a compact assembly. The cross-roller bearing supports combined axial and radial loads as well as overturning moments, helping maintain stability when handling eccentric or demanding workpiece loads. In compatible configurations, this integrated structure eliminates the need for separate auxiliary bearing blocks and transmission couplings, simplifying mechanical assembly and improving overall system rigidity.
Compared with Direct Drive (DD) motor solutions, the geared transmission design can provide torque multiplication and a cost-effective alternative for applications involving frequent start-stop indexing. The actual advantages depend on the required output torque, payload inertia, cycle time, positioning performance, and selected drive configuration.
Compared with traditional mechanical cam indexers, a Hollow Rotating Platform paired with a compatible servo motor and controller can support programmable angular positioning. This flexibility allows indexing angles to be adapted to different station layouts and production requirements, making the platform suitable for automated equipment that needs adjustable positioning sequences.
The large-diameter hollow through-hole design across the series allows pneumatic lines, electrical cables, and suitable laser-related paths to pass through the rotary center where the application permits. Internal routing helps reduce external cable loops and the risk of tangling during rotation, while appropriate cable routing and bend-radius management help minimize fatigue caused by repeated movement.
As part of our CNC Rotary Motion System range, the Hollow Rotating Platform can be evaluated according to payload requirements, indexing flexibility, installation space, and machine integration needs.
Product Series Overview
01 | Coaxial / Horizontal Series (Worm Gear Drive)
The Coaxial / Horizontal Series of the Hollow Rotating Platform features an integrated worm gear transmission that delivers smooth rotary motion and self-locking characteristics under suitable operating conditions. Its compact profile and low center of gravity facilitate space-efficient horizontal installation in automated rotary indexing systems. Equipped with integrated cross-roller bearings, this series provides rigid support for axial and radial loads as well as overturning moments, helping maintain rotary table stability and control axial and radial runout. These structural advantages make it suitable for precision assembly, automated inspection, and indexing applications where stable workpiece support, reliable positioning, and compact equipment integration are essential.
02 | Right-Angle Series (Spiral Bevel Gear Drive)
The Right-Angle Series of the Hollow Rotating Platform features a precision-ground spiral bevel gear mechanism that transfers torque through a 90° angle, allowing the motor to be mounted horizontally at the side to reduce the machine's overall vertical profile. Compared with straight bevel gears, the spiral tooth geometry provides a higher contact ratio and improved shock resistance, supporting smooth and stable rotary transmission under demanding operating conditions. With a maximum payload capacity of up to 270 kg and rated output torque of up to 420 Nm, this series is designed for space-constrained, heavy-duty applications such as 4th-axis CNC machining centers and heavy-duty welding positioners, where compact installation, high load capacity, and reliable rotary positioning are essential.
03 | Hypoid Series (Hypoid Gear Drive)
The Hypoid Series of the Hollow Rotating Platform features a precision-ground hypoid gear pair that combines sliding and rolling contact during transmission, providing a high tooth contact ratio and smooth rotary motion. Designed for precise positioning with an accuracy of ≤1 arcmin and operating noise of ≤65 dB, this series combines high torque density with substantial axial load capacity to meet demanding automation requirements. With an IP65 protection rating and a maximum payload capacity of up to 400 kg, the Hypoid Series is suitable for automated assembly systems, dust-prone industrial environments, and noise-sensitive production areas where positioning accuracy, load handling, and reliable operation are essential.
Core Technical Excellence
The Hollow Rotating Platform offers three transmission configurations—worm gear, spiral bevel gear, and hypoid gear—to accommodate different installation layouts, load requirements, and rotary motion characteristics. The worm gear drive provides smooth transmission and self-locking characteristics under suitable operating conditions. The spiral bevel gear drive redirects torque through 90°, allowing a side-mounted motor arrangement that helps reduce the machine's vertical profile. The hypoid gear drive uses an offset-axis configuration to support compact integration and high torque density. By matching the transmission geometry to the application's operating requirements, engineers can balance installation space, output torque, positioning performance, and operating characteristics. Actual performance depends on the selected series and operating conditions.
The output rotating table integrates a precision cross-roller bearing with rollers arranged in a 90° crossed configuration. This bearing architecture supports combined axial and radial loads as well as overturning moments within a compact assembly, reducing the need for separate auxiliary bearing blocks in compatible installations. By providing rigid support directly beneath the output table, the design helps control axial and radial runout, minimize end-face wobble, and maintain positioning stability under eccentric loading. The published runout specification of ≤0.01 mm should be verified against the applicable model and measurement conditions, particularly for applications requiring strict geometric accuracy and long-term repeatability.
The modular motor adapter flange and input shaft assembly are designed to facilitate integration with compatible AC servo and stepper motors. Motor options may include products from brands such as Yaskawa, Mitsubishi, and Panasonic, subject to the availability of a matching adapter, shaft configuration, and applicable drive specifications. This modular interface can reduce mechanical adaptation work when configuring the rotary platform for different automation systems. Before installation, engineers should verify motor mounting dimensions, shaft compatibility, rated speed, required torque, and control-system interfaces to ensure reliable integration with the host machine.
The large-diameter hollow through-hole design allows electrical cables, pneumatic lines, and suitable laser-related optical paths to pass through the rotary center where the application permits. Routing these components through the center can reduce external cable loops, improve equipment layout, and minimize the risk of tangling during repeated rotary movement. For automated assembly equipment, inspection systems, and laser-processing applications, this arrangement can simplify the integration of power, signal, and fluid connections. Actual routing requirements should account for the available bore diameter, cable bend radius, line protection, rotational movement, and any application-specific optical alignment requirements.
Typical Application Scenarios
The Hollow Rotating Platform supports rotary positioning in automated welding systems, where the large-diameter hollow bore can accommodate torch cables, shielding gas lines, and other suitable connections routed through the rotary center. This arrangement helps reduce external cable loops and the risk of tangling during repeated rotation. Depending on the selected transmission configuration, the platform can support stable workpiece positioning for different welding orientations. For applications requiring continuous 360° rotation or safe position holding during emergency stops, the cable management arrangement and braking or holding requirements should be verified for the complete system.
Semiconductor wafer handling systems require precise rotary positioning, compact equipment integration, and carefully managed utility connections. The hollow-bore design allows suitable vacuum lines, electrical cables, and signal connections to pass through the rotary center, helping simplify equipment layout. The Hypoid Series, with its specified positioning accuracy of ≤1 arcmin and IP65 protection rating, may be considered for compatible automation applications where positioning stability and environmental protection are important. Actual cleanroom suitability must be evaluated according to particle generation, material compatibility, lubrication, and the cleanliness requirements of the intended process.
The Hollow Rotating Platform provides a geared rotary positioning option for laser cutting, marking, and other automated processing equipment that requires programmable angular indexing. Its hollow-bore structure can accommodate suitable cables and laser-related paths where the optical configuration permits, helping simplify routing through the rotary center. Compared with a direct-drive motor solution, a geared platform may offer a more suitable balance of output torque, installation space, and system cost for certain indexing applications. The final choice should account for positioning accuracy, acceleration, cycle time, backlash, thermal behavior, and optical alignment requirements rather than assuming a universal drop-in replacement.
In 3C manufacturing, including consumer electronics, computers, and communication equipment, rotary indexing platforms can support multi-station assembly, inspection, and component positioning. The compact integrated structure helps reduce the space required for separate transmission and bearing components, while the hollow bore provides a practical route for power cables, signal lines, and pneumatic connections. When paired with a compatible servo motor and controller, the platform can support programmable angular positioning for different station layouts and production sequences. For noise-sensitive assembly environments, the Hypoid Series offers a specified operating noise level of ≤65 dB. Actual positioning performance, noise, maintenance intervals, and cycle-time suitability should be confirmed against the selected model and production conditions.
Selection & Engineering Support
This Hollow Rotating Platform overview provides a general guide to the available series and their application characteristics. For model-specific dimensions, exact hollow bore diameters, permissible axial and radial loads, gear ratios such as 1:5, 1:10, and 1:18, and other detailed specifications, please refer to the full Hollow Rotating Platform Technical Manual.
When comparing models, consider not only the maximum payload but also the workpiece's center of gravity, load distribution, required output torque, positioning accuracy, and available installation space. The selected platform should match the actual operating conditions and indexing requirements of the machine.
Correct inertia matching, acceleration and deceleration calculations, and duty-cycle evaluation are essential for reliable rotary indexing performance. A platform that meets the static payload requirement may still require further verification when the application involves high-frequency start-stop cycles, eccentric loads, or short positioning times.
Share your payload mass, rotary table diameter, workpiece center of gravity, target cycle time, required indexing angle, and installation constraints with our engineering team. The application engineers at Dongguan Hangonghui Intelligent Equipment Co., Ltd. can provide dynamic calculations and model recommendations free of charge, helping you evaluate a suitable configuration for your application.
To facilitate model selection and integration, please provide the following information where available:
Payload and Workpiece: Workpiece mass, dimensions, center of gravity, and fixture weight.
Motion Requirements: Required indexing angles, positioning accuracy, cycle time, acceleration, and deceleration requirements.
Installation Constraints: Available space, mounting orientation, motor interface, and required hollow bore diameter.
Operating Conditions: Duty cycle, expected operating environment, and any specific noise or protection requirements.
Workpiece drawings, machine layout drawings, and the intended motion sequence can further assist the engineering evaluation.
Selecting a hollow rotating platform is only one part of designing a reliable automated machine. The transmission configuration, motor, workholding arrangement, cable routing, and surrounding machine structure should be evaluated as an integrated system.
Explore our CNC Machining Tooling Solutions for application-oriented equipment configuration and tooling support. Contact our team with your technical requirements to discuss model suitability, installation compatibility, and the next steps for your project.
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