A well-established manufacturer of heavy-duty lathes and mills based in Gipuzkoa, Spain, BOST Machine Tools Co (BOST) is reducing machine set-up time by 50% and improving rotary axis accuracy with Renishaw’s XR20-W rotary axis calibrator and off-axis rotary software.

With an increasingly demanding market, BOST was facing the need to verify and improve the precision of rotary axes – the primary challenge being the calibration of rotary B axes. B-axis calibration is critical in five-axis machine performance verification to maintain quality, but due to the design of the rotary heads, it was not possible to mount equipment at the centre of these axes to confirm performance. BOST also wanted to improve the performance of C axes, which the company measured previously using a pentaprism system. This method offered no measurement flexibility; a 360° test is limited to capturing 12 positions at 30° intervals.

Renishaw engineers demonstrated the XR20-W rotary axis calibrator on various machines at BOST. The XR20-W offered complete flexibility with test method set-up. It became possible to configure tests with capture intervals and measurement ranges to suit the requirements of the axis in question. Furthermore, Renishaw’s off-axis rotary software allowed BOST to mount the XR20-W away from the centre of axis rotation, providing a simple solution for the calibration of rotary B axes. In fact, this flexibility enabled the company to see improvements in specification for both rotary B and C axes.

BOST decided to purchase the XR20-W rotary axis calibrator as it offered the best five-axis calibration solution for its requirements. When used in conjunction with the company’s existing XL-80 laser interferometer it provides high accuracy of ±1 arc seconds, easy set-up, and fast data capture.

For further information
www.renishaw.com