No abstract

Comparative cutting tests have been carried out on a horizontal milling machine, having the worktable fitted, in turn, with pressurized oil "single phaseflow"bearings,pressurized mixture flow, and a conventional lubricational system. Special table and saddle for that machine were designed and manufactured to be capable for applying all methods of lubrication. Awide range of depth of cuts and feed rates were used. Both surface roughness and vibrational parameters were measured.The use of pressurized oil and mixture flow bearings slideways increase the machine stability and produced more fine surface roughness than conventional lubrication slideways.

This paper is concerned with a theoretical analysis of two types of double film bearings; namely, circular-circular and rectangular-rectangular, lubricated with incompressible fluid.. In order to have a clear understanding of the performance characteristics of these two types of double film bearings, the performance characteristics that include load carrying capacity, flow rate, power, and stiffness of single film circular and rectangular bearing is presented. The results revealed that, the given mathematical model can be used in the design of a double film bearings. A comparison between the performance characteristics of circular-circular and rectangular-rectangular double film bearings are presented, assuming that they have the same area and the same supply pressure.