Hollow Rotary Cross Roller Table

What is Hollow Rotary Cross Roller Table?

A hollow rotary cross roller table is a precision rotary positioning platform that uses a cross roller bearing-rollers arranged in alternating perpendicular orientations within a single raceway-to support the rotating worktable, combined with a central through-bore for cable or utility pass-through. This bearing configuration delivers exceptional rigidity, high moment load capacity, and minimal runout in a compact, single-bearing design, making it well suited for precision rotary applications with demanding load and accuracy requirements.

Structure

The table integrates a cross roller bearing directly supporting the rotating worktable, combined with a precision reduction drive (worm gear, planetary, or direct-drive) that provides angular positioning. The central bore passes through the bearing and drive assembly, allowing cables, vacuum lines, or fixture hardware to route through the rotation axis. The cross roller bearing's alternating roller orientation allows it to simultaneously handle radial, axial, and moment loads without requiring separate bearing sets.

Selection Considerations

Key factors include bore diameter, cross roller bearing load rating (radial, axial, moment), positioning accuracy and repeatability, torsional stiffness, backlash, indexing speed, and permissible runout. Because the single cross roller bearing bears all combined loads, verifying its rated capacity against actual application loading-including dynamic and shock loads-is especially important during selection.

Applications

Hollow rotary cross roller tables are used in robotic joints, precision inspection and metrology systems, rotary indexing stations, semiconductor handling equipment, and machine tool rotary axes where high rigidity, low runout, and combined load capacity are required in a compact footprint.

Installation Considerations

Mounting surfaces must be flat and rigid to prevent bearing preload distortion. Flange bolts should be torqued evenly in a cross pattern per specification. Installers should verify bore pass-through clearance for routed cables, confirm bearing preload and runout meet specification, and check lubrication before commissioning the table into service.Hollow Rotary Cross Roller Table - noted above. Ready for the next term whenever you'd like to continue.

Here In this page, we introduce series of Hollow Rotary Cross Roller Table TMN280,

you will see data sheet, production pictures,videos of test as follows:

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FAQ:

1. What does the rated radial load of a hollow rotating platform mean?
     Rated radial load is the maximum perpendicular force the platform can handle continuously. This force acts on the output table surface. Exceeding this value reduces bearing life or causes permanent damage.

2. What is the typical ratio of rated axial load to radial load?
    For crossed roller bearings, the axial load capacity equals or slightly exceeds the radial capacity. The typical ratio ranges from 1:1 to 2:1 (axial:radial). Manufacturers specify exact values for each model.

3. How many times can the maximum instantaneous load of Hollow Rotary Cross Roller Table reach the rated load?
Maximum instantaneous load reaches 2 to 3 times the rated load for short peaks. This applies only during sudden starts or stops. Do not exceed this limit, or permanent deformation will occur.

4. What is the impact of load eccentricity on the performance of Hollow Rotary Cross Roller Tables?
Load eccentricity creates an overturning moment. This moment adds extra stress on bearings. It reduces effective load capacity and shortens service life. Higher eccentricity causes more wear and lowers positioning accuracy.

5. How to calculate the overturning moment required for a hollow rotating platform?
Multiply the applied force by its eccentric distance from the platform center. For radial force, moment = radial force × height offset. For axial force, moment = axial force × radial offset. Add vector contributions for combined loads. Consult the manufacturer's formula sheet.