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2 Applied Mechanics and Engineering

2 1999

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Hydrostatic - hydrodynamic hybrid conical supports

Ahuja B. B., Chikate P. P., Basu S. K.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

11-17

The paper deals with the development of hydrostatic hydrodynamic hybrid conical bearings, running at 10,000 r.p.m., suitable for supports of high-speed spindles. Conical bearing bush is designed for two-plane admission, with 8 holes in each plane, with a semi cone angle of 10o. In case of static response, the interactions between the major parameters, e.g. radial load, supply pressure and bearing design parameter 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 authors generalised the exponential relationship existing between eccentricity ratio, radial load and supply pressure.

Contact deformation of filled and unfilled teflon under varying temperature

Gholap G., Navale L. G., Chikate P. P.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

207-212

In modern CNC machines, there is a possibility of temperature generated at the contacting interface which affect the distribution pattern of asperities and hence the elastoplastic deformation at the contact. There is no evidence of experimental work in this area, varying the temperature at the interface. In this paper, an attempt has been made to study the contact deformation behaviour of filled and unfilled TEFLON, under varying load and varying temperature at the contacting interface. The measurement was done using TESA electronic comparator in contact compliance test rig. Contact deformation of Carbon Filled Teflon was observed lower than that of Pure and Glass filled Teflon. Empirical relationship between load, temperature and contact deformation has been found out. Entire experiment has been carried out by processing through statistical design of experiments.