During the operation of CNC rotary tables, industrial robot joints, precision optical testing equipment and automatic indexing devices, rotary support parts need to bear radial loads, axial loads and overturning moments simultaneously while maintaining extremely high rotary precision and structural stability. Traditional combined bearing schemes require multiple sets of bearings for assembly, occupying abundant installation space with complicated assembly procedures, which easily lead to accumulated assembly errors. Ordinary slewing bearings feature relatively large volume and cannot adapt to lightweight compact precision equipment. Industries of precision automation and intelligent equipment are in urgent demand for crossed roller bearings with simplified structure and multi-directional load capacity.

High-end precision equipment keeps upgrading toward miniaturization, lightweight design and high precision. Available installation space inside rotary mechanisms is continuously compressed, and stricter standards are put forward for positioning accuracy and repeated rotation precision. Insufficient rigidity of rotary supports will cause deformation and displacement of rotary components under overturning moments, directly triggering positioning deviation of robots, inaccurate indexing of processing equipment and distortion of optical detection data. Many precision equipment runs continuously for a long time. Once bearing precision declines, overall machine performance drops rapidly with high cost for shutdown maintenance. Conventional bearings on the market can hardly bear radial loads, axial loads and moment loads within limited space. Intelligent precision equipment urgently needs high-quality crossed roller bearings to guarantee operational precision.

NMT Crossed Roller Bearings adopt a layout that cylindrical rollers are arranged at 90 degrees between inner and outer raceways. A single bearing can bear radial loads, axial loads and overturning moments at the same time, greatly simplifying structural design of rotary parts on equipment. Rollers go through ultra-high precision sorting with excellent dimensional consistency to reduce rotary clearance and realize high-precision rotary positioning. Boasting highly compact structure and small radial thickness, the bearings significantly save internal installation space of equipment and fit lightweight mechanical structures. Multiple sealing options are available. Dust-sealed versions can prevent fine dust from invading raceways and adapt to workshop production environments. Integral or split inner and outer rings are optional to facilitate equipment assembly and preload adjustment. Overall dimensions comply with universal industrial standards for convenient replacement during renovation of all types of precision automation equipment, supporting long-term grease lubrication.

Inner and outer rings are made of high-purity bearing alloy steel. Precision forging optimizes internal metallographic structure and improves compression resistance and fatigue performance of raceway areas. All metal components go through stabilized heat treatment to control thermal deformation and guarantee geometric precision of raceways. Ultra-precision grinding is applied on raceways to achieve excellent surface finish, lower rolling friction resistance and restrain precision loss after long-duration operation. Rollers are processed by fine grinding with strictly controlled dimensional tolerances to ensure even load distribution. Seals are made of aging-resistant and wear-resistant materials, not easy to harden or damage during long-term operation and continuously protect internal rolling contact surfaces.

The bearings cover abundant specifications with good interchangeability. Widely applied in CNC rotary tables of five-axis machine tools, articulated arms of multi-joint industrial robots, rotary platforms for visual inspection, automatic indexing plates, precision handling mechanisms of semiconductor equipment and rotary assemblies of medical imaging equipment, meeting demands of high-precision multi-load support for all kinds of precision rotary mechanisms.

Core Product Advantages

Rollers arranged at 90 degrees. One single bearing bears radial loads, axial loads and overturning moments, eliminating assembly of multiple bearing sets;

Extremely compact structure with small radial size, effectively reducing overall machine volume and fitting design of lightweight precision equipment;

Ultra-precision machined raceways and rolling elements with controllable rotary clearance and high repeated positioning accuracy, suitable for precision indexing scenarios;

Excellent rigidity to resist deformation induced by moment loads and maintain long-term stable precision of rotary mechanisms;

Multiple sealing configurations available with outstanding dust-proof performance to reduce early wear caused by dust pollution;

Split and integral inner/outer ring options facilitate installation and commissioning and support preloading according to demands;

Stable friction resistance during rotation with sensitive start-stop response, suitable for high-frequency reciprocating rotation and intermittent indexing working conditions;

Standardized serial specifications, directly compatible with mounting structures of mainstream precision equipment for efficient equipment upgrading and renovation.

Typical Application Scenarios

CNC rotary tables matched with five-axis machining centers and grinders; joints and rotary bases of 4-axis & 6-axis industrial robots; rotary platforms for optical inspection and visual scanning; indexing turntables and turnover tooling on automatic production lines; precision rotary handling modules for semiconductor equipment; rotary support mechanisms of medical imaging instruments; rotary bases of small precision radar and monitoring pan-tilts.

Quality Assurance

NMT Crossed Roller Bearings are produced with premium special alloy steel for bearings. Incoming raw materials complete composition analysis and metallographic sampling inspection to strictly control impurity content inside steel. Blanks of inner and outer rings are formed by precision die forging to optimize metal flow distribution of load-bearing raceway areas and enhance fatigue resistance. Multiple stress relief stabilization treatments are carried out after rough machining to eliminate internal processing stress and avoid deformation during subsequent machining and long-term loading. Multi-stage ultra-precision grinding is implemented on raceway working surfaces to strictly control roundness, straightness and surface roughness and minimize rolling wear.

All rollers pass dimensional screening and flaw detection one by one to remove workpieces with tiny defects. Components go through high-pressure ultrasonic cleaning and constant-temperature drying before assembly in constant-temperature dust-free workshops. Finished products complete rotary precision tests, overturning moment durability tests and dust-proof simulated operation tests. All unqualified products are eliminated thoroughly to ensure consistent precision of bulk goods and provide reliable compact rotary support solutions for precision intelligent equipment.

Product Range

Integral crossed roller bearings, split crossed roller bearings; open type and sealed dust-proof type optional. Selection depends on precision grade, load conditions and service environment.

Brand Strength

NMT focuses on R&D and manufacturing of precision rotary bearings. Aiming at miniaturization and high-precision demands of industrial robots, CNC precision machine tools and optical inspection equipment, NMT continuously optimizes ultra-precision raceway grinding technology and roller matching solutions. The bearings effectively solve common pain points of precision rotary mechanisms including large space occupation of support bearings, insufficient multi-directional load capacity and rapid precision decline, extend service life of bearings for high-end intelligent equipment and reduce calibration and maintenance frequency of precision machinery.