Robot joints, CNC indexing tables, automatic rotary tooling, precision inspection equipment and rotary units of vertical machining centers require bearings with compact size, high rigidity and high precision simultaneously. Traditional combined bearing layouts occupy larger axial installation space and hinder lightweight machine design. Ordinary slewing rings are bulky and difficult to control rotary clearance during low-speed rotation, failing precision positioning applications. Conventional ball bearings lack rigidity. Elastic deformation occurs under combined loads and causes positioning errors and reduced repeat accuracy.

Lots of precision automation equipment requires bearings to bear radial loads, axial loads and overturning moments. Frequent start-stop and intermittent positioning operations will lead to clearance expansion of inferior bearings after long-term operation, resulting in unstable machining accuracy and detection data. Limited internal space restricts bearing dimensions. The market demands compact crossed roller bearings capable of carrying combined loads and maintaining stable rotary precision.

NMT Precision Crossed Roller Bearings adopt 90-degree crossed roller arrangement. A single bearing unit supports radial loads, axial loads and overturning moments at the same time and simplifies structural design of rotary parts. Linear contact between short cylindrical rollers and raceways provides sufficient contact rigidity with tiny deformation under load to sustain stable rotary accuracy. Inner and outer rings undergo integral hardening and repeated ultra-precision grinding to form smooth raceways. Minimal clearance and preload configurations are available to suppress rotary shaking.

Compact radial and axial dimensions reduce installation space compared with multi-bearing combinations and support lightweight and miniaturized equipment design. Diverse specifications include gearless, internal gear and external gear versions to directly fit servo indexing devices and robot joints. Precision-grade products feature tight control over rotary runout and suit automation equipment requiring high-precision angular positioning. With proper lubrication and sealing, bearings operate steadily under dusty conditions and are widely adopted for all kinds of precision rotary mechanisms.

Core Product Advantages

Crossed roller layout enables single bearing to withstand combined radial load, axial load and overturning moment, eliminating complicated multi-bearing assembly;

Linear contact support delivers outstanding rigidity and small elastic deformation under load to maintain stable positioning accuracy;

Compact integrated structure reduces axial thickness and saves internal installation space for small precision equipment;

Ultra-precision ground inner and outer rings support minimal clearance and preloaded assembly to reduce rotary shake and improve repeat positioning accuracy;

Gearless, internal gear and external gear versions are available to match driving structures of servo indexing tables and robot rotary joints;

Stable running friction prevents creeping during low-speed rotation, meeting precision indexing demands of inspection and CNC machining equipment;

Stable heat treatment and excellent raceway wear resistance slow precision degradation under continuous intermittent start-stop and extend maintenance cycles.

Typical Application Scenarios

Joints and rotary bases of 6-axis industrial robots; CNC indexing plates, 4-axis rotary tables; precision automatic turnover jigs, vision inspection rotary platforms; small vertical CNC machining equipment, grinder rotary units; semiconductor automatic transfer mechanisms, rotary supports for optical testing instruments.

Quality Assurance

NMT Precision Crossed Roller Bearings follow strict precision-grade quality control. Incoming bearing steel receives metallographic and hardness inspection. After forging and precision turning, inner and outer rings go through integral quenching, tempering and multi-stage superfinishing. Strict control is implemented for raceway dimensional accuracy and surface finish. Rollers are individually graded to minimize dimensional deviation. Precision machined cages ensure smooth and uniform roller movement. After assembly, finished products pass rotary runout testing, clearance inspection, torque testing and load simulation verification. All non-compliant products are eliminated. NMT continuously supplies high-precision rotary support solutions for manufacturers of precision automation equipment and robots.

Product Range

Gearless crossed roller bearings, internal gear crossed roller bearings, external gear crossed roller bearings. Professional selection guidance is provided according to precision grade, load capacity, driving mode and dust level of working environment.

Brand Strength

NMT has long focused on R&D and manufacturing of precision rotary bearings. Targeting high-precision intermittent rotary conditions of robots and CNC indexing devices, NMT continuously optimizes raceway profile, heat treatment and preload assembly technology. The brand effectively solves industry pain points including complicated combined bearing structures, insufficient rigidity, increased rotary clearance and declining positioning accuracy. It helps precision automation equipment maintain stable machining and positioning performance and reduces frequency of precision calibration.