The increase of manufacturing accuracy on the machine tools depends mainly on the motion accuracy of the mobile elements as: rams, tables, pads, etc., accuracy that can be achieved, firstly, by minimization of the friction in the guide ways. This problem is solved by replacing the sliding friction with the rolling friction but especially by using the hydrostatic guide ways, where the contact surfaces are separated by a continuous film of fluid under pressure. The present paper describes mathematical modeling of hydrostatic guide ways having a porous restrictor in order to analyze the influence of functional parameters on the film lubricant thickness.