Joints of industrial robots, CNC rotary tables, precision index plates and optical inspection equipment face radial loads, axial loads and overturning moments simultaneously during operation, requiring strict standards for rotation accuracy and positioning repeatability. Conventional combined solutions of spherical roller bearings and angular contact bearings require multiple sets of bearings, resulting in larger overall volume and complicated assembly and debugging procedures, failing to meet miniaturization demands of precision equipment. Ordinary single-row roller bearings can only bear loads in a single direction and cannot resist overturning moments, easily triggering positioning deviation and rotation jamming. High-end intelligent manufacturing equipment urgently demands integrated support bearings capable of bearing composite loads with excellent rotation precision.

Many precision automation equipment works on long-term intermittent indexing and reciprocating rotation with frequent startup and shutdown as well as precise positioning. Once bearing clearance expands or rigidity becomes insufficient, machining errors and reduced detection accuracy will occur directly. Many machines have compact installation space which cannot accommodate multiple bearing groups for composite load support. General bearings on the market hardly satisfy multiple performance indicators including compact size, high rigidity, low rotation clearance and multi-directional load bearing. The machinery manufacturing industry urgently needs precision crossed roller bearings to solve composite load support problems at high-precision rotary positions.

NMT Precision Crossed Roller Bearings adopt cylindrical rollers arranged at 90 degrees. A single bearing can bear radial loads, bidirectional axial loads and overturning moments simultaneously and simplify overall structural layout. Line contact between rollers and raceways delivers sufficient rigidity. Precision grinding achieves tiny rotation clearance, and preload options are available to restrain elastic deformation during rotation and guarantee rotary positioning accuracy. Featuring highly compact integrated structure, inner and outer rings simplify installation procedures. The bearings adapt to high-precision low-speed intermittent rotation scenarios and are widely used for various precision rotary support positions.

Rollers, inner and outer rings are manufactured from high-purity bearing alloy steel. After forging, multiple precision grinding and superfinishing processes are conducted to stabilize raceway profile precision and achieve smooth uniform contact surfaces. All core components go through deep quenching and long-time low-temperature stabilization treatment to reduce dimensional variation under long-term alternating loads and deliver outstanding wear resistance and anti-fatigue performance. Rollers are sorted at micron level with extremely low dimensional dispersion for even load distribution. Optimized cages separate rollers accurately to avoid mutual friction and maintain steady rotation continuously, while reserved lubrication passages ensure even grease distribution.

The bearings feature abundant specifications and good interchangeability. Widely applied to 6-axis industrial robot joints, CNC rotary tables, precision index plates, optical inspection instruments, rotary mechanisms of CNC grinders and automated turnover tooling, satisfying high-precision composite load rotary support demands.

Core Product Advantages

Rollers arranged at 90°, a single bearing bears radial, bidirectional axial loads and overturning moments to simplify mechanical structure;

Line contact structure provides excellent rigidity. Optional preload realizes ultra-small rotation clearance to guarantee high-precision positioning and repeated indexing;

Highly compact overall structure greatly reduces required installation space compared with multi-bearing combinations and supports lightweight miniaturization of equipment;

Precision superfinished raceways deliver balanced rotation resistance and stable operation without jamming or crawling under low speed;

Stabilized deep heat treatment for components prevents deformation under long-term alternating loads and maintains consistent precision;

Optimized cage separates rollers to avoid mutual friction, extend bearing service life and lower maintenance frequency;

Multiple structural options including open type and sealed type, adaptable to dust-free workshops and ordinary industrial environments;

Complete standardized dimension system enables simple assembly, cuts debugging time and reduces assembly difficulty of precision equipment.

Typical Application Scenarios

Rotary joints of six-axis industrial robots and collaborative robots; CNC rotary tables and 4th-axis index plates of machining centers; rotary platforms of optical visual inspection equipment; rotary support mechanisms of precision grinders and honing machines; turnover tooling and positioning rotary fixtures on automated production lines; rotary modules for semiconductor handling equipment; precision rotary supports of medical imaging equipment.

Quality Assurance

NMT Precision Crossed Roller Bearings are manufactured with premium refined bearing alloy steel. Incoming inspection covers chemical composition testing and metallurgical sampling to eliminate material defects at source. Blanks of inner and outer rings adopt precision forging technology to optimize internal metal flow lines and improve overall structural rigidity. Stress relief annealing is carried out after rough machining to remove internal processing stress, followed by quenching and low-temperature stabilization treatment to restrain dimensional drift under long-term alternating loads.

Raceways and rollers go through rough grinding, finish grinding and superfinishing with strict control over profile precision, surface roughness and dimensional tolerance. All rollers pass flaw detection screening to remove workpieces with cracks and dents. All components receive high-pressure cleaning and dust-free drying before assembly in constant-temperature clean workshops. Seals and lubricants are selected according to service environments. After assembly, finished bearings undergo rigidity testing, rotation clearance inspection, endurance indexing simulation testing and temperature rise inspection. All nonconforming products are eliminated completely to guarantee unified stable precision of bulk goods and supply high-performance support solutions for high-end precision rotary equipment.

Product Range

Open-type crossed roller bearings, dustproof sealed crossed roller bearings, preloaded precision crossed roller bearings. Selection depends on precision grade, load conditions and operating environment.

Brand Strength

NMT specializes in R&D and manufacturing of high-precision rotary bearings. Targeting industry pain points of composite loads, high-precision positioning and limited installation space existing in industrial robots and CNC precision worktables, NMT continuously optimizes roller layout, raceway machining precision and thermal stabilization technology. The bearings effectively solve common problems such as complicated multi-bearing assembly, insufficient rigidity of ordinary bearings and rapid precision attenuation after long service. NMT products support stable high-precision operation of high-end intelligent equipment and guarantee long-term precision work of precision machining and automated inspection machinery.