| 摘要 |
A description is given of a spindle ( 1 ) in which the moving part ( 2 ) fixed to the tool-holding collet ( 3 ) is supported by one or more aerostatic bushes ( 4 ) on cushions of air generated by a jet of compressed air that circulates continuously along the air gaps ( 5 ) between the aerostatic bushes ( 4 ) and the said moving part ( 2 ) and passes out of the spindle ( 1 ) through the co-axial aperture ( 6 ) formed in a flange ( 7 ) through which the abovementioned toll-holding collet ( 3 ) projects from the said spindle ( 1 ). In the spindle ( 1 ) of the invention, directing means ( 8 ) are attached to the outside of the said flange ( 7 ) to collect the air passing out of the abovementioned aperture ( 6 ) and cause it to adopt an outward direction of motion (E) that is tangential to or incidient on the terminal part ( 3 t) if the tool-holding collet ( 3 ) and roughly parallel to the axis of the said spindle ( 1 )
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