Abstract
In the 1st report, it was shown that the positioning accuracy of machine tool table can be described with the over travel length XOR of the table after the moment of the positioning signal input, and the limitation of the positioning accuracy may be given with the dispersion of XOR caused by the fluctuation of frictional force in slide way. In the present paper, the correlation between the repeatability of positioning of the table and the fluctuation of frictional force in slide way is investigated under various conditions, and the following conclusions are obtained: (1) By decreasing the surface roughness of slide way, the fluctuation of frictional force in slide way may decrease and high repeatability can be achieved. (2) The periodicity of low frequency in the surface roughness of slide way makes the positioning accuracy lower. (3) At a particular feed velocity, the fluctuation of frictional force in slide way may cause a kind of resonance in feed drive device.
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