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ORTM Series – Rotary Table Bearings with Integral Angle Measurement System
The ORTM series is a high‑precision bearing solution that integrates an angle measurement system directly into the ORT turntable bearing platform. This integration allows for angle measurement with an accuracy of up to 1 arc second, making the ORTM series exceptionally suitable for applications where precise angular positioning is critical.
Why Integrated Angle Measurement?
Angular displacement measurement plays a vital role in modern industrial automation, particularly in the machine tool industry. Workpiece rotation angles must be strictly controlled to achieve high machining accuracy. The ORTM series eliminates the need for external encoders by embedding the measurement system directly into the bearing, saving space, reducing assembly complexity, and improving system reliability.
Measurement Technology
The ORTM series supports commonly used angular displacement measurement methods, including optical encoders and magnetic encoders. This flexibility allows the bearing to be adapted to different control systems and environmental conditions, from clean laboratory settings to harsh shop floor environments.
Mechanical Performance
Because the measurement system is built upon the ORT series bearing platform, the ORTM series retains all the mechanical advantages of ORT bearings:
Extremely high rotational accuracy – inherits P4/P2 precision grades
High axial rigidity – maintains stable positioning under thrust loads
High radial load capacity – handles significant radial forces
High stiffness – resists elastic deformation under combined loads
Integrated preload – ensures consistent rigidity without additional adjustment
Load Capability
Like the standard ORT series, ORTM bearings are designed to simultaneously withstand axial loads, radial loads, and overturning moments. This combined load capability makes them ideal for compact, high‑performance rotary axes where space is limited but load requirements are demanding.
Typical Applications
The ORTM series is widely used in:
High‑precision CNC rotary tables (4th and 5th axes)
Indexing heads / dividing heads for machining centers
Gear hobbing and gear milling machines
Vertical and horizontal grinding machines
Direct drive motor (DD motor) applications
Research and laboratory experiments requiring precise angle measurement
High‑precision measurement equipment and test fixtures
Available Models
The ORTM series is available in the following standard models, with custom sizes offered upon request:
| Model | Note |
|---|---|
| ORTM200 | |
| ORTM260 | |
| ORTM325 | |
| ORTM395 | |
| ORTM460 | |
| ORTM580 | |
| ORTM650 | |
| ORTM850 | |
| ORTM950 |
In addition, the ORTSM series (high‑speed version with integrated measurement system) is also available for applications requiring both high speed and angular measurement.
Key Advantages at a Glance
1 arc second accuracy – built‑in system eliminates external encoder
Space‑saving design – no separate encoder mounting required
High rigidity and preload – ready for demanding machining
Supports axial, radial and overturning loads – one bearing, multiple functions
P4/P2 precision – meets highest machine tool standards
Multiple encoder options – optical or magnetic
Wide model range – from 200mm to 950mm diameter
Ordering and Support
For detailed dimensional drawings, technical specifications, or custom requirements, please contact us. We can also provide application engineering support to help you select the optimal ORTM bearing for your specific rotary axis design.
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