Industrial robot joints, CNC rotary tables, precision indexing plates, optical testing equipment and automatic turnover tooling need to withstand radial loads, axial loads and overturning moments simultaneously during operation, with strict requirements for rotary accuracy and operational rigidity. Combined installation of ordinary bearings occupies large space, and matched multiple bearings easily generate cumulative assembly errors, which hinders compact equipment design. Conventional slewing rings are bulky, and rotary clearance cannot be precisely controlled, failing to meet micro-angle positioning requirements of precision equipment.

High-end automated equipment is continuously developing toward miniaturization, light weight and high precision. The reserved internal installation space of equipment is extremely limited. Traditional bearing solutions cannot satisfy multi-directional load capacity and thin structure requirements at the same time. Rotary shake and insufficient repeated positioning accuracy tend to occur during operation, directly affecting the qualification rate of processing and inspection. Some precision stations demand low-speed operation without crawling and minimal clearance. Ordinary bearings produce large deformation under load and cannot maintain stable accuracy for a long time. The market demands high-precision crossed roller bearings with thin profile and high rigidity to bear composite loads, adapting to various precision rotary mechanisms.

NMT Crossed Roller Bearings adopt vertically crossed roller arrangement. Cylindrical rollers are alternately arranged at 90 degrees. A single bearing can bear radial loads, axial loads and overturning moments simultaneously, greatly simplifying transmission structures and reducing the number of components. Inner and outer rings receive integral quenching and ultra-precision grinding with high dimensional accuracy and controllable rotary clearance to realize high-precision positioning rotation. The compact thin outline effectively saves axial and radial installation space, matching the lightweight design trend of robots and CNC rotary tables.

Multiple preload structures are optional. Appropriate preload restrains deformation under load, improves overall rigidity, ensures stable low-speed operation and eliminates crawling. The complete standardized specification system supports direct replacement of imported crossed roller bearings of the same type, suitable for new equipment development and renovation of old machinery. Sealed versions are equipped with dust-proof structures to prevent cutting dust and oil from invading raceways and extend bearing service life, widely applied to all kinds of precision rotary transmission units.

Core Product Advantages

Rollers arranged at 90 degrees, a single bearing bears composite radial, axial and overturning loads, simplifying mechanical structures and lowering assembly difficulty;

Thin and compact structure saves installation space and supports miniaturized lightweight design of automation equipment and robots;

Inner and outer rings processed by superfinishing grinding deliver high rotary accuracy and controllable clearance to guarantee repeated positioning precision under precision indexing and positioning conditions;

Multiple optional preload configurations improve overall rigidity, reduce deformation under load, realize stable low-speed operation and avoid crawling;

Optional dust-proof sealing structure isolates dust and cutting fluid pollution, adapting to complex working conditions of machine tool processing and automated workshops;

Standard universal overall dimensions with excellent interchangeability; major adjustment of mechanical structure is unnecessary during renovation of new and old precision equipment;

Stable rotational friction resistance and sensitive response, suitable for precision motion scenarios with frequent forward-reverse rotation and intermittent indexing.

Typical Application Scenarios

Joints of 6-axis industrial robots, rotary units of collaborative robots; rotary tables and 5-axis indexing plates of CNC machining centers; optical inspection rotary platforms, vision measuring equipment; automatic turnover tooling, precision servo rotary devices; semiconductor automation equipment, rotary mechanisms of small CNC grinders.

Quality Assurance

NMT Crossed Roller Bearings implement full-process high-precision quality control. Raw materials receive metallographic structure and hardness inspection after incoming delivery. Inner and outer rings go through precision turning, quenching heat treatment and repeated superfinishing grinding. Raceway profile accuracy, parallelism and flatness are strictly controlled. Rollers are graded and screened to minimize dimensional dispersion. Cages are precision processed to eliminate roller jamming risks. After assembly, finished products are tested sequentially for rotary accuracy, torque, load simulation and clearance verification. All unqualified products are eliminated. NMT continuously supplies high-precision rotary bearing solutions for precision automation, machine tool and robot industries.

Product Range

Standard crossed roller bearings, preloaded crossed roller bearings, sealed dust-proof crossed roller bearings. Professional selection guidance is provided based on accuracy class, load capacity, rotating speed and dust protection demands.

Brand Strength

NMT has long focused on R&D and manufacturing of high-precision rotary bearings. Targeting pain points of precision indexing working conditions such as robot joints and CNC rotary tables, NMT continuously optimizes raceway profile design, heat treatment technology and roller matching schemes. The brand effectively solves common industrial problems of traditional bearing combinations including excessive space occupation, insufficient rigidity and rapid attenuation of positioning accuracy. It assists high-end automated equipment to realize compact high-precision design and reduce component procurement and assembly costs for equipment manufacturers.