B-Axis Rotary Table Bearing Replacement Case Study
This case study shows how TEDIN supported a rotary table bearing replacement project for a B-axis rotary table in a precision machine tool application.
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Matched Bearing Development for a CNC Rotary B-Axis
TEDIN worked with a high-end five-axis CNC machine tool manufacturer to develop a matched tapered roller bearing set for the rotary B-axis. The bearing position required high rigidity, smooth motion and stable positioning accuracy under repeated indexing and cutting loads.
A bearing position that directly affects machining stability
In a five-axis CNC machine tool, the B-axis rotary table must handle tilting movement, precise indexing and continuous cutting loads. Any variation in bearing preload, rigidity or running accuracy can be reflected in positioning error, vibration or reduced surface quality.
The customer needed more than a standard replacement bearing. The requirement was a matched bearing set developed around the rotary table’s load condition, accuracy target and long-term maintenance needs.
Bearing Position
The set was developed for the rotary B-axis, where the bearings support tilting movement, indexing accuracy and machining loads within a compact rotary table structure.
Operating Demand
The application required higher support rigidity, reduced vibration and stable rotational accuracy during repeated positioning and heavy-duty cutting.
Development Scope
TEDIN provided a paired tapered roller bearing solution covering internal structure optimization, precision component manufacturing and set-level matching inspection.
High-Precision Tapered Roller Bearings Supplied for the Project
TEDIN supplied 329, 320 and 323 series high-precision tapered roller bearings as matched-set options for the customer’s B-axis rotary table application.
Compact-section bearings for rotary supports
Used where the rotary axis requires a compact bearing section, controlled preload and stable axial-radial load support.
Matched bearings for rigidity and smooth motion
Applied in paired arrangements where bearing stiffness, preload consistency and smooth rotary movement are important to table performance.
High-load bearings for demanding rotary axes
Selected for rotary axis positions that require stronger load support and stable performance under combined machining loads.
Finding a Bearing Set That Could Hold B-Axis Accuracy
The customer had tried several bearing options for the B-axis rotary table. Most of them could meet the installation size. The harder part was keeping the axis stable during repeated indexing, tilting movement and long machining cycles.
Size compatibility was only the starting point
For this rotary table, the bearing set had to do more than fit into the existing space. It had to support the table during positioning and cutting, while keeping rotation smooth over long operating periods.
In previous trials, some bearings looked suitable on paper but showed limitations after installation. Small changes in running smoothness or support stiffness could affect positioning repeatability and leave marks on the machined surface.
Where the previous options fell short
- Some bearings met the required dimensions, but did not provide enough stability for precision rotary movement.
- Rotation became less consistent after long running periods.
- Vibration marks appeared in some precision machining conditions.
- The B-axis needed better support during repeated indexing and tilting movement.
Engineering the Bearing Set Around B-Axis Performance
TEDIN developed the solution as a matched tapered roller bearing set rather than a direct single-bearing substitution. The work focused on pairing, structure, manufacturing control and final verification.
Matched set configuration
The bearings were prepared as a paired set instead of two independent units, helping the assembly maintain more consistent preload behavior after installation.
Internal structure optimization
Hollow rollers, a one-piece solid cage and an anti-rib structure were used to reduce friction and support smoother rotary movement.
In-house precision grinding
Key bearing surfaces were processed through TEDIN’s in-house grinding process to improve dimensional consistency between supplied sets.
Final set verification
Each matched set was checked for dimensional matching, running condition and rotational accuracy before delivery.
Approved for B-Axis Rotary Table Application
The final bearing set passed TEDIN’s inspection and met the customer’s requirements for use in the B-axis rotary table.
Stable performance after installation
After installation, the rotary table operated steadily during repeated positioning and machining cycles. The customer accepted the bearing set as a reliable replacement option for this high-precision bearing position.
The solution was approved for B-axis rotary table use and became a validated option for future precision machine tool projects.
Key inspection values
- Ring cone angle deviation: within ±0.001 mm.
- Rolling element precision: Grade 1.
- Bore diameter ≤ 200 mm: rotational accuracy ≤ 0.003 mm.
- Bore diameter ＞ 200 mm: rotational accuracy ≤ 0.005 mm.
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Ready to Evaluate Your Bearing Replacement?
Send TEDIN your bearing model, drawings or application details. Our team will review the replacement feasibility and recommend a suitable matched bearing set for your rotary table or precision machine tool application.
Photos, dimensions and inspection requirements are helpful but not required.
Existing model, brand, quantity, arrangement, photos, drawings or current bearing dimensions.
Installation position, machine type, working condition, load type and replacement purpose.
Rotational accuracy, preload condition, rigidity target, tolerance grade or inspection standard.
Replacement feasibility, matched set configuration, inspection requirements and supply options.