Numeric control machine tool

Numeric control machine tool (1) of the type comprising a basement (2) and a substantially rectilinear main supporting crossmember (4) which extends above the basement (2) remaining locally parallel to a first substantially horizontal reference axis (Y), and has the two ends (4a) structured so as stably to rest in an axially sliding manner each on a respective rectilinear longitudinal guide (3) which extends on the basement (2) parallel to a second reference axis (X) substantially horizontal and perpendicular to the first axis (Y);

• the machine tool (1) also comprising:
• a movable slide (11) which is protrudingly fixed onto a side (4b) of the main supporting crossmember (4) with the possibility of moving along the body of the main supporting crossmember (4) in a direction (dy) substantially parallel to said first axis (Y);
• and
• a substantially rectilinear, movable vertical tower (12) which extends coaxially to a third reference axis (Z) orthogonal to the lying plane of said first axis (Y) and second axis (X), and is fixed on the movable slide (11) in a substantially vertical position, with the possibility of translating with respect to the movable slide (11) in a direction (dz) substantially parallel to said third axis (Z);
• the main supporting crossmember (4) being structured so as to stably support the weight of the movable slide (11) and the movable vertical tower (12);
• the numeric control machine tool (1) being
• characterised by also comprising a substantially rectilinear auxiliary supporting crossmember (17) which extends beside the main supporting crossmember (4) so as to locally face and be spaced from the side (4b) of the crossmember which supports the movable slide (11);
• and
• in that the movable slide (11) is provided with at least one projecting arm (18) which protrudes towards the auxiliary support crossmember (17) until it crosses the auxiliary supporting crossmember (17), and rests on the auxiliary supporting crossmember (17) with the interposition of a reaction member (19) which is structured so as to vary its height (h) exercising on the projecting arm (18) an upward thrust (f) having a value such as to produce, on the main supporting crossmember (4), an additional mechanical moment (Mc) which is substantially equivalent and opposite to the mechanical moment (Mp) which the weight of the movable slide (11) and of the movable vertical tower (12) naturally generate on the main supporting crossmember (4) due to the distance between the barycenters of the movable slide (11) and of the mobile tower (12) and the side (4b) of the crossmember which supports the movable slide (11).