NMT Ltd.
Corporate Communications Department
NMT Precision Crossed Roller Bearings High Precision Thin-Wall Heavy Load Crossed Roller Bearings For Industrial Robot Joints, CNC Index Tables And Automated Rotary Platforms
Rotary mechanisms inside industrial robots, CNC turntables and optical testing equipment are restricted by limited installation space. Meanwhile, continuous composite loads and overturning moments are generated during operation. Ordinary bearings require multiple sets for multi-directional load bearing, resulting in bulky overall structures which cannot meet miniaturization and lightweight requirements.
High-precision processing and testing equipment impose strict requirements on rotary runout and repeated positioning accuracy. Insufficient bearing rigidity causes tiny deformation during rotation, directly impairing workpiece machining precision and detection data. Many automated turntables perform frequent start-stop and intermittent indexing. Alternating moment loads gradually enlarge the clearance of ordinary bearings and trigger rapid precision degradation. The market demands compact, high-rigidity precision crossed roller bearings capable of enduring complex overturning moments.
NMT Precision Crossed Roller Bearings are manufactured from high-purity bearing steel with stable integral heat treatment, improving rigidity and anti-fatigue performance. Orthogonally arranged rollers enable single bearing units to withstand multi-direction composite loads, removing the need for combined bearing sets and minimizing equipment dimension.
Thin-walled integrated inner and outer rings feature central through holes for cable routing, facilitating pipeline layout through rotation centers and matching structural requirements of robot joints and rotary fixtures. Raceways receive mirror-level ultra-precision grinding. Preloaded types are optional to eliminate rotary clearance, reduce rotational shake and maintain high precision for long-term operation. Various sealing structures can be equipped to prevent dust and cutting mist from invading raceways and extend service life. Complete standard dimensions support renovation and upgrading of domestic and imported automated rotary machinery.
Core Product Advantages
Rollers arranged at 90 degrees. Single bearing bears radial loads, axial loads and overturning moments to simplify mechanical design;
Thin compact structure saves installation space and supports lightweight and miniaturized equipment development;
Ultra-precisely ground raceways, optional preloaded design deliver high rotary rigidity, low runout and sustained precision;
Central through-hole allows cables and air tubes to pass through, ideal for robot joints and rotary tool layout;
Multiple sealing options resist dust and oil pollution for complicated workshop operating environments;
Comprehensive size lineup with great interchangeability for direct replacement of imported crossed roller bearings.
Typical Application Scenarios
Waist and wrist rotary joints of 6-axis industrial robots; CNC vertical rotary tables and precision index plates; optical vision inspection rotary platforms; laser processing rotary fixtures; semiconductor automatic rotary mechanisms; precise rotating components for medical equipment; turnover rotary jigs on automated assembly lines.
Quality Assurance
NMT Precision Crossed Roller Bearings implement full-process control of forging, heat treatment and ultra-precision grinding. Each finished unit undergoes rotary accuracy inspection, rigidity testing, clearance calibration and rotation endurance test. High-precision rotary bearing solutions are steadily supplied to intelligent manufacturing, robot and precision machine tool industries.
Product Range
Open type and sealed types in abundant sizes; clearance adjustable and preloaded versions available. Professional selection guidance based on accuracy class, load moment, rotating speed and environmental conditions is offered.
Brand Strength
NMT focuses on R&D of precision rotary bearings. Solving industry challenges including limited installation space, composite moment load and precision loss after long-term operation for robots and precision turntables, NMT continuously optimizes raceway machining, heat treatment and clearance control technology to develop high-rigidity long-life crossed roller bearings and support high-end automated equipment manufacturing.