PNEUMATIC SPINDLE WITH MEANS TO DIRECT THE BEARING AIR TOWARDS THE TOOL-HOLDING COLLET

摘要

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 moving part ( 2 ) and passes out of the spindle ( 1 ) through the co-axial aperture ( 6 ) formed in a flange ( 7 ) through which the tool-holding collet ( 3 ) projects from the spindle ( 1 ). Directing elements ( 8 ) are attached to the outside of the 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 incident on the terminal part ( 3 t) of the tool-holding collet ( 3 ) and roughly parallel to the axis of the spindle ( 1 ).