High speed supports using aerostatic aerodynamic bearing

Deals with the development of aerostatic‐cum‐aerodynamic hybrid conical bearings, running at 70,000 r.p.m., suitable for supports of high speed spindles. Conical bearing bush is designed for two plane admission, with eight holes in each plane, with a semi cone angle of 108. In case of static response, the interactions between the major parameters, are projected on 3D response surface curve. The results give the magnitude of radial load to get the benefit of optimally minimum eccentricity ratio. Experimental results show close agreement with the theoretical work in regard to “no‐rotation” cases. The exponential relationship existing between eccentricity ratio, radial load and supply pressure is generalised. Rigidity for the bearings developed, as seen from the response surface, supports the observations of previous researchers. For the use of designers, vital operational parameters have been tabulated. Estimated and experimental values of these parameters compare reasonably.