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Renishaw has introduced its off-axis rotary software for the XR20-W rotary-axis calibrator, which extends the capability of the XR20-W to many five-axis machine tools. The software allows the XR20-W to be used to measure the rotary positioning accuracy of an axis on many configurations of five-axis machine tools, even when the XR20-W cannot be mounted on the centre of rotation.

Combined with Renishaw’s XL-80 laser interferometer, the XR20-W rotary-axis calibrator allows rotary-axis positioning performance to be measured with ±1arc-sec accuracy. With the new off-axis test capability, users can now test more types of machine tools than was previously possible with the XR20-W.

The method for off-axis measurement works by synchronising the movement of rotary and linear axes so that the XL-80’s laser beam is kept aligned throughout the test. Because the linear axis is moving, the measurements made by the XR20-W may include additional angular errors from the linear axis.

These contributory angular errors are then measured separately (using the XL-80 laser and angular optics) and removed from the initial rotary-axis results. The end result is a set of data reflecting only the errors from the rotary axis itself.

Key features and benefits

  • Users are able to test more types of machine tools
  • Rotary-axis positioning performance is measured with ±1arc-sec accuracy
  • Movement of rotary and linear axes is synchronised
  • Contributory angular errors are remvoed to ensure accurate results

Renishaw

A world leader in engineering technologies, Renishaw’s core skills in measurement and precision machining serve sectors as diverse as dimensional metrology, spectroscopy, machine calibration, motion control, dentistry and surgical robotics.

A world leader in engineering technologies, Renishaw’s core skills in measurement and precision machining serve sectors as diverse as dimensional metrology, spectroscopy, machine calibration, motion control, dentistry and surgical robotics.

Sensors for co-ordinate measuring machines (CMMs) are an industry standard, from basic touch-trigger probes through to automated stylus and probe changers, motorised indexing probe heads, and revolutionary five-axis measurement systems.

Machine probes for CNC machine tools allow automated tool setting, workpiece set-up, in-cycle gauging and part inspection. Products include laser tool setters, contact tool setters, tool breakage detectors, touch probes and high accuracy inspection probes.

For motion control, Renishaw supplies laser encoders, optical linear encoders, optical angle encoders, optical rotary encoders, magnetic rotary encoders, magnetic chip encoders and magnetic linear encoders.

To analyse the static and dynamic performance of position-critical motion systems, Renishaw’s laser interferometer and environmental compensation system offers a linear measurement accuracy of 0.5 ppm, readings of up to 50 kHz and a linear measurement speed of up to 4 m/s, with a linear resolution of 1nm.

Renishaw’s Raman spectroscopy products exploit the Raman effect to identify and characterise the chemistry and structure of materials. A diverse range of analytical applications include pharmaceutical, forensic science, nanotechnology, biomedical and semiconductors.

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