System of variable hydrostatic guideway for vertical lathes and a vertical lathe that includes said guideway

Variable hydrostatic track system for vertical lathes which comprises an annular base arranged between a support base and a securing rotating chuck of a vertical lathe, a central opening in the annular base which surrounds a rotation shaft of the rotating chuck;

• a plurality of sectors forming a circle and projecting vertically between a periphery of the annular base and the central opening of the annular base, each sector comprising an upwardly open upper housing;
• at least one hydraulic fluid outlet arranged at the bottom of each housing and which allows injecting hydraulic fluid into the corresponding housing such that, when the injected hydraulic fluid overflows from the housings, the hydraulic fluid pushes the rotating chuck upwards, forming a film of hydraulic fluid between the rotating chuck and the sectors;
• and
• further comprising a positioning mechanism capable of positioning the sectors at least in an inner radial position in which at least one part of the sectors is arranged at a circumference of a minimum diameter and in an outer radial position in which at least one part of the sectors is arranged at a circumference of a maximum diameter.