Industrial robots, CNC rotary tables, precision indexing devices and automated rotary tooling often face design constraints of limited installation space. Traditional combined bearing structures are bulky with unbalanced radial and axial rigidity, unable to bear radial loads, axial loads and overturning moments simultaneously. Ordinary slewing bearings are heavy and difficult to reduce thickness, hindering miniaturization and lightweight upgrading of precision automated equipment. High-end intelligent equipment imposes strict requirements on rotary positioning accuracy and repeated positioning stability. Clearance emerging during rotation directly leads to machining errors and motion deviation. The market demands compact thin-type precision cross roller bearings capable of bearing multi-directional loads.

Intelligent precision equipment operates under high-frequency reciprocating rotation and intermittent positioning. Bearings endure radial force, axial force and overturning moment simultaneously during operation. Ordinary ball bearings only support single-direction loads and require multiple sets for assembly, enlarging mechanical volume and increasing assembly difficulty. Multi-bearing combination schemes can hardly control preload clearance accurately. Clearance expands after long-term operation and positioning accuracy declines continuously. Robot joints and CNC indexing plates pursue compact body, leaving limited installation space for bearings. Lightweight components are required to reduce driving load. Equipment manufacturers prefer integrated cross roller bearings. A single bearing unit undertakes multi-dimensional loads, simplifies transmission structures and guarantees long-term stable high-precision operation.

NMT Precision Cross Roller Bearings adopt a structural design with cylindrical rollers arranged perpendicularly at 90 degrees. One single bearing bears radial loads, axial loads and overturning moments at the same time and greatly simplifies mechanical transmission structures. The ultra-thin compact overall structure features small spacing between outer and inner diameters, reduces axial dimensions of complete machines and supports lightweight equipment design. Raceways are ultra-precisely ground. Clearance type and preloaded specifications are optional to eliminate rotary clearance and achieve excellent rotary accuracy and repeated positioning precision. Multiple sealing options prevent dust and cutting fluid from invading raceways, adapting to machine processing and automated workshop environments. Cages separate rollers accurately to avoid direct friction between rollers, lower temperature rise during operation and extend service life. Standard mounting holes are reserved for convenient disassembly and assembly, matching installation structures of various rotary tables and robot joints. Raw materials receive stabilized heat treatment with low internal stress, resisting deformation under long-duration continuous operation and maintaining high precision persistently.

Inner and outer rings are forged from high-purity bearing alloy steel. Multiple stabilized heat treatment processes eliminate processing stress and lower deformation risks under long-term operation. Ultra-precision grinding is carried out on raceways to strictly control surface roughness and geometric precision for stable and smooth roller rolling. Cylindrical rollers go through automatic dimension sorting with tiny dimensional dispersion for even load distribution and prevention of local stress concentration. Seals are made of cutting-fluid-resistant and wear-resistant synthetic materials to adapt to complex machining environments. All finished products pass rotary accuracy inspection, torque testing and durability simulation tests to screen unqualified products strictly.

Comprehensive specifications are available. Widely applied in six-axis industrial robot joints, CNC rotary tables, precision indexing plates, visual inspection rotary platforms, automated welding positioners and semiconductor precision rotary equipment, meeting supporting demands of high-precision rotation and multi-directional load working conditions.

Core Product Advantages

Cross layout of rollers enables one bearing unit to bear radial loads, axial loads and overturning moments, reducing bearing quantity and simplifying mechanical structures;

Ultra-thin integrated compact structure reduces axial thickness, saves installation space and supports miniaturization and lightweight upgrading of automated equipment;

Ultra-precision grinding on raceways with optional preload eliminates rotary clearance and delivers superior rotary accuracy and repeated positioning performance;

Optional diversified sealing structures resist dust and cutting fluid erosion, suitable for complex industrial environments including machining workshops and automated production lines;

Independent cages isolate rolling elements to reduce roller friction and collision, lower operating temperature rise and adapt to long-duration continuous intermittent rotation;

Stable heat treatment achieves excellent internal stress control to resist deformation under long-term loaded operation and sustain stable precision;

Standard reserved mounting holes eliminate extra transition parts, simplify assembly and shorten assembly man-hours;

Stable torque fluctuation and uniform rotary resistance reduce driving load of servo motors and improve motion control stability of equipment.

Typical Application Scenarios

Rotary joints of industrial robots; rotary tables for CNC machining centers; precision indexing plate equipment; rotary platforms for visual inspection; automated welding positioners; precision rotary modules for semiconductor equipment; rotary brackets for optical testing instruments; rotary units of small intelligent machine tools.

Quality Assurance

NMT Precision Cross Roller Bearings adopt high-grade bearing alloy steel raw materials. Incoming materials receive composition inspection and non-metallic inclusion testing. Inner and outer rings go through forging, precision cutting, stabilized heat treatment and ultra-precision raceway grinding to continuously control geometric accuracy of raceways. Automatic grading and sorting are implemented for cylindrical rollers to guarantee dimensional consistency within each bearing set. Sealing components and cages receive precision machining and thorough deburring to avoid scratching raceway contact surfaces during assembly.

All components pass visual flaw inspection and full dimensional measurement. Workpieces with cracks, collision marks and out-of-tolerance dimensions are eliminated completely. Assembled finished products undergo rotary accuracy testing, starting torque inspection and long-duration cyclic durability tests. Defective goods are sorted out to guarantee consistent precision among batches and supply reliable bearing solutions for high-precision intelligent rotary equipment.

Product Range

Standard cross roller bearings, preloaded precision cross roller bearings, sealed cross roller bearings. Selection depends on precision grade, load capacity, rotating speed and field environment.

Brand Strength

NMT specializes in R&D and manufacturing of high-precision rotary bearings. Targeting industry challenges including difficulties bearing multi-directional loads, limited installation space and continuous precision decline after long-term operation on industrial robots and CNC rotary tables, NMT continuously optimizes raceway machining technology and heat treatment processes. The bearings effectively mitigate common failures such as expanded rotary clearance, precision attenuation and excessive roller wear, reduce maintenance frequency of intelligent equipment, sustain continuous high-precision production of automated assembly lines and cut long-term operation costs of high-end machinery.