Cases

RU Crossed Roller Bearings Help US Machine Tool Customer Enhance Rotational Precision

Date: November 10, 2025

Customer: A Leading US CNC Equipment Manufacturer

Case Background

In early 2025, a renowned US CNC equipment manufacturer faced technical bottlenecks with the core component of the rotary table while developing a new generation of high-precision machining centers. The customer required an ultra-high-precision crossed roller bearing with an outer diameter of 150mm and inner diameter of 76mm, with the installation height strictly limited to an extremely thin dimension. Additionally, the bearing needed to meet P4 precision class standards to ensure the table maintained micron-level rotational accuracy even at high speeds.

The customer initially tested standard series products from multiple suppliers, but none could simultaneously meet the strict dimensional constraints and precision requirements. While standard RU series crossed roller bearings met the precision criteria, their conventional height exceeded the installation space designed by the customer. This technical challenge directly hindered the progress of the entire project.

Technical Challenges

Dual Tests of Space and Precision

The core dilemma for the customer's engineering team was achieving high rigidity and precision of the bearing within limited space. Traditional RU crossed roller bearings offer excellent rotational accuracy and torque rigidity, but the height of standard models failed to meet the customer's compact design needs.

Stringent Performance Requirements

Rotational accuracy:

Radial runout ≤ 3μm

Stiffness requirement: Axialstiffness ≥ 400N/μm

Dimensional constraint: Installation height 30% lower than standard bearings

Service life: ≥ 20,000 hours under continuous operation

NewBee Transmission's Solution

Customized Design and Engineering Optimization

Upon receiving the customer’s request, NewBee Transmission's technical team quickly formed a dedicated engineering group. Through the redesign of the RU series crossed roller bearings, we developed a thin-type high-precision crossed roller bearing, perfectly resolving the customer's space constraints.

Key Technical Parameters:

Outer diameter: 150mm (±0.005mm)

Inner diameter: 76mm (±0.003mm)

Height: 12mm (35% lower than standard RU series)

Precision class: P4 (exceeding the customer's required P5 class)

Roller arrangement: 1:1 crossed arrangement with optimized contact angle design

Innovative Technical Features

Our engineering team redesigned multiple key aspects of the bearing:

Adopted a special thin-type cage design to maintain sufficient roller capacity while reducing bearing height.

Optimized raceway geometry to enhance bearing torque rigidity and operational precision.

Applied a special surface treatment process to ensure optimal wear resistance within limited dimensions.

Implemented customized preload settings to ensure the bearing achieves peak performance immediately after installation.

Implementation Results

Performance Verification

After delivery, the customer conducted rigorous testing and verification:

Rotational accuracy test result: Radial runout of 2.5μm, axial runout of 3.0μm

Stiffness test: Axial stiffness reached 450N/μm, exceeding expectations by 12.5%

Temperature rise test: Temperature rise 15% lower than standard bearings at rated speed

Life test: Accelerated life testing indicated an expected service life of up to 25,000 hours

Customer Feedback

"The customized crossed roller bearing solution provided by NewBee Transmission not only resolved our space constraint issues but also delivered performance that exceeded our expectations," stated the customer’s chief engineer. "This thin-design RU series bearing operates stably on our rotary table, greatly improving the machining precision and reliability of our equipment."

Industry Significance

The successful implementation of this case demonstrates that in the high-end CNC equipment sector, customized precision bearing solutions can bring a qualitative leap to equipment performance. Through the innovative thin-type crossed roller bearing design, NewBee Transmission has provided a new technical pathway for the miniaturization and high-precision development of high-precision CNC equipment.

Our engineering team will continue to dedicate itself to providing professional bearing solutions for global customers, driving the manufacturing industry toward higher precision and efficiency. Whether in standard products or customized solutions, NewBee Transmission will uphold the concept of technological innovation to create greater value for customers.

About NewBee Transmission

NewBee Transmission specializes in the R&D and manufacturing of high-precision bearings and transmission components, with profound technical accumulation and rich application experience in precision transmission fields such as crossed roller bearings and thin-section bearings. We are committed to providing the most professional transmission solutions for global customers, promoting the continuous advancement of industrial technology.

Contact Us:

Email: paul@newbeetrans.com

Phone: +86 15122832049 Official

Website: www.newbeetrans.com