Renishaw's Six-Degree-of-Freedom Precision Position Measurement Encoder System

[Erkan Teskancan]

## Renishaw's Six Degrees of Freedom Absolute Position Measurement Encoder System

Renishaw has introduced absolute position tracking technology capable of measuring up to six degrees of freedom with its new 1.5D scale optical encoder system for precise motion systems and advanced error compensation.

### Multi-axis Measurement and Industrial Needs
Sectors such as semiconductor manufacturing, precision machining, photonics, and advanced automation systems demand multi-axis position information with high accuracy and speed. In response to these needs, Renishaw developed a true multi-degree-of-freedom (multi-DoF) optical encoder system by combining absolute encoder readers with new scale technology.

### RXMA30 1.5D Scale and Multi-axis Measurement
At the heart of the system is the RXMA30 1.5D scale. This scale is designed to work seamlessly with RESOLUTE absolute encoder readers. Thanks to separate measurement paths, it provides direct position data in the X and Y axes without the need for complex signal interpolation methods.

### System Advantages and Applications

• Simultaneous tracking of multi-axis movements
• Impact of mechanical imperfections on positional accuracy
• Impact of thermal changes on system stability

Absolute encoder technology eliminates the need for difficult or impractical phasing routines, especially in axes where motion control is limited.

### Measurement Up to Six Degrees of Freedom
The system supports 6DoF measurement to detect linear and rotational deviations. This allows for:

• Straightness deviations of linear guides
• Small linear displacements
• Rotational errors in motion stages

to be monitored and corrected, thereby increasing process capability and efficiency.

### Stability in Thermal and Dynamic Conditions
The RXMA30 scale provides repeatable and stable measurement performance even in challenging conditions such as temperature changes and vibrations. These features are particularly suitable for applications such as:

• Semiconductor wafer positioning systems
• Laser processing systems in photonic manufacturing
• High-precision CNC and measurement devices

### Flexible Integration
Compatible with a wide range of serial interfaces and motion control platforms, the system can be easily integrated into existing machines without requiring extensive redesign. Its modular structure allows for multiple scale and reader combinations for different needs.

### Importance of Multi-DoF Encoder Technology
In applications where single-axis feedback is insufficient, multi-DoF systems reduce reliance on mechanical alignment and external calibration. Renishaw combines absolute position measurement with multi-axis capabilities to offer solutions that enable real-time error compensation and reduce complexity. This approach is compatible with high-precision automation and smart manufacturing technologies.