Currently, ballbar tests defined in ASME and ISO standards are limited to the three primary working planes and do not address the challenges presented by four and five-axis ma- chines. However, new test routines have been proposed that include a machine’s rotary axes and are currently being considered for inclusion in a new ISO 10971-6 standard, and there are also references to four and five-axis tests in Appendix J of ASME B5.54 2005, according to Warren. To determine the angular accuracy and repeatability of rotary axes, Renishaw recently launched the XR20-W, a wire- less rotary-axis calibrator. “It uses an ultra-high accuracy encoder, originally designed for the new generation of
active probe heads such as the new Renishaw PH20,” said Warren. Designed to work with their XL-80 or ML-10 laser interferometer systems, the XR20-W measures to better than ±1 arc-second. ME
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