Precise air spindle, especially for operating gauges of deviations in roundness of rotary surfaces and flatness of front surfaces

摘要

The present invention relates to an air spindle comprising especially a workbench (4) provided with a fulcrum pin (1) arranged in a base body (10). The fulcrum pin (1), provided with a machined cylindrical surface (2) and a machined front surface (3), is arranged by its peripheral cylindrical surface (2) in a machined internal cylindrical surface (5) of a radial casing (6) made of porous carbon composite. The radial casing (6) is fixdly mounted in the internal cylindrical surface (9) of the base body (10) provided with a radial recess (11) in the area between both the front faces of the radial casing (6) wherein a compressed air inlet (P1) opens in said radial recess (11). Front surface (3) of the fulcrum pin (1) is adjacent to a machined front surface (12) of a permeable disk (13) made of carbon composite, or the fulcrum pin (1) machined front surface (3) is adjacent to a single-jet foot bearing (23) with a centrally disposed nozzle (24), the compressed air inlet (P2) and a functional front flat or preferably slightly conical surface (25) with camber (x) at the edge in the order of units to decades of microns. The permeable disk (13) or the single-jet foot bearing (23) is fastened within a swinging foot support (16), which is provided in its central area with a circular recess (17) with the compressed air inlet (P2).