By a News Reporter-Staff News Editor at Science Letter -- Current study results on Science have been published. According to news reporting from Xi'an, People's Republic of China, by NewsRx journalists, research stated, "The rotational performance of high-precision rolling bearings is fundamental to the overall accuracy of complex mechanical systems. A nano-level instrument to analyze rotational accuracy of high-precision bearings of machine tools under working conditions was developed."
The news correspondents obtained a quote from the research from Xi'an Jiao Tong University, "In this instrument, a high-precision (error motion < 0.15 mu m) and high-stiffness (2600 N axial loading capacity) aerostatic spindle was applied to spin the test bearing. Operating conditions could be simulated effectively because of the large axial loading capacity. An air-cylinder, controlled by a proportional pressure regulator, was applied to drive an air-bearing subjected to non-contact and precise loaded axial forces. The measurement results on axial loading and rotation constraint with five remaining degrees of freedom were completely unconstrained and uninfluenced by the instrument's structure. Dual capacity displacement sensors with 10 nm resolution were applied to measure the error motion of the spindle using a double-probe error separation method. This enabled the separation of the spindle's error motion from the measurement results of the test bearing which were measured using two orthogonal laser displacement sensors with 5 nm resolution. Finally, a Lissajous figure was used to evaluate the non-repetitive run-out (NRRO) of the bearing at different axial forces and speeds. The measurement results at various axial loadings and speeds showed the standard deviations of the measurements' repeatability and accuracy were less than 1% and 2%."
According to the news reporters, the research concluded: "Future studies will analyze the relationship between geometrical errors and NRRO, such as the ball diameter differences of and the geometrical errors in the grooves of rings."
For more information on this research see: Nano-level instrumentation for analyzing the dynamic accuracy of a rolling element bearing. Review of Scientific Instruments, 2013;84(12):636-642. Review of Scientific Instruments can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Review of Scientific Instruments - rsi.aip.org/)
Our news journalists report that additional information may be obtained by contacting Z. Yang, Xi An Jiao Tong Univ, Educ Minist Modern Design & Rotor Bearing Syst, Key Lab, Xian 710049, People's Republic of China. Additional authors for this research include J. Hong, J. Zhang, M.Y. Wang and Y. Zhu (see also Science).
Keywords for this news article include: Asia, Xi'an, Science, People's Republic of China
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