首页|Development of a Linear-motor-driven Table Supported by Hydrostatic Water Bearings: Effect of Air Volume Contained in Water-supply Tube on Pitching Motion of Table Slider

Development of a Linear-motor-driven Table Supported by Hydrostatic Water Bearings: Effect of Air Volume Contained in Water-supply Tube on Pitching Motion of Table Slider

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  • NSTL
  • Trans Tech Publications Ltd
A linear-motor-driven table supported by hydrostatic-water bearings had been developed. The table slider is supported by a single-sided recess type bearing system and preloaded by attractive force using a linear-motor magnet. Since eccentric excitation force is applied to the table slider due to the change of attractive force according to the magnet track position of the linear-motor, pitching motion of the table occurs. This paper investigates the effect of air volume contained in a water-supply tube on the pitching motion. Larger air volume results in lower natural pitching frequency of the table slider, lower logarithmic decrement of the pitching motion and larger pitching angle. When the natural pitching frequency corresponds to the frequency of the eccentric excitation force during table feed, pitching angle grows by resonation.

waterhydrostatic bearingsingle-sided recesslinear motormagnettable sliderpitching angleair

Akinori Yui、Go Okahata、Shigeki Okuyama、Hisashi Kobayashi、Alexander Henry Slocum

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National Defense Academy, 1-10-20, Hashrimizu, Yokosuka, Kanagawa, 239-8686, Japan

Okamoto Machine Tool Works LTD., 2993 Gobara, Annaka, Gunnma, 379-0135, Japan

Massachusetts Institute of technology, 77, Massachusetts Avenue, Cambridge, MA, 02139, USA

2010

10.4028/www.scientific.net/KEM.447-448.508

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.447/448
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