Constructive and operational features of linear mechanotronic module on the basis of stockless pneumocylinder with magnetic coupling and aerostatic flat support that allows to compensate guideway deformations of movable carriages arising under the influence of moved weights and external technological loading are considered. Design features of mechanotronic module of linear movement are characterized by the big working courses of a target element—carriages, which is intended for the objects placed for processing or assembly manufacture. The carriage has two guideways. One of them is a cylindrical—the corps of stockless pneumocylinder with magnetic couplings and with the П-shaped section, the second is planar, representing the closed aerostatic (gas) support. While in service on the carriage operational forces are created by the masses of manufacture object being on it and by the tool of technological device (processing and assembly). Force deformations of guideways thus occurring cause changes of clearances of gas support. It can lead to change of their bearing ability, occurrence of mechanical contacts that negatively influences accuracy of positioning of the carriage, speed and drive durability. These deformations are also reflected on dynamic characteristics of planar bilateral (closed) gas guideways, representing beam with a squared shape cross-section. They can cause not only its longitudinal deflection, but also turn off cross-section. The self-established planar gas support includes the axial bearing with a pocket of squared or round form, supplied with the spherical convex part placed in conic deepening of the carriage and kept in it are two elastics in axial direction thin-walled bellows. By means of internal bellows the supply of compressed air from the compressor in a pocket through the channel in the carriage is provided in a starting position, i.e., in the absence of pressure in channels, the axial bearing is drawn to the guideway surface by the forces created by bellows. Between its spherical surface and conic surface of carriage the clearance whose size defines the clearance in the gas support, formed in the course of air giving in the pocket is formed. Compressed air arriving in pocket creates carrying power of the gas support, which causes the axial bearing displacement and the bellows compression. Thus, because of the presence of spherical support, under the influence of uniformly distributed pressure in the pocket cavity (Pascal's law), the axial bearing is self-setting concerning the surface in rectangular direction with formation of uniform clearance on perimeter.