An apparatus for carrying out operations on semi-finished devices, in particular for producing disposable cartridges for electronic cigarettes, comprising: - a guide having a branch extending along a forming direction of a longitudinal plane and at least two rolling surfaces symmetrically arranged with respect to said longitudinal plane, - a plurality of carriages movable along said guide, each of which comprises at least two wheels which engage respective rolling surfaces, wherein each of said carriages comprises a retaining element to retain a respective semi-finished device during the execution of operations thereon; - a drive system for advancing said carriages along said guide, and - a plurality of operating stations spaced apart from each other along said forming direction, each of which comprises operating means (40, 56) configured to perform specific operations on semi-finished devices carried by said retaining elements of the carriages, applying stresses on said semi-finished devices, wherein the retaining element of each carriage is arranged laterally with respect to said longitudinal plane of said guide, characterised in that the apparatus further comprises at least one stationary support located at least at said operating stations, in that each of said carriages further comprises a respective contrast element cooperating with said stationary support and arranged to transfer the stresses applied by said operating means (40, 56) on said semi-finished devices to said stationary support, and in that the stresses applied by said operating means (40, 56) on said semi-finished devices are discharged by said contrast elements onto said stationary support without stressing said wheels of said carriages. - a guide having a branch extending along a forming direction of a longitudinal plane and at least two rolling surfaces symmetrically arranged with respect to said longitudinal plane, - a plurality of carriages movable along said guide, each of which comprises at least two wheels which engage respective rolling surfaces, wherein each of said carriages comprises a retaining element to retain a respective semi-finished device during the execution of operations thereon; - a drive system for advancing said carriages along said guide, and - a plurality of operating stations spaced apart from each other along said forming direction, each of which comprises operating means (40, 56) configured to perform specific operations on semi-finished devices carried by said retaining elements of the carriages, applying stresses on said semi-finished devices, wherein the retaining element of each carriage is arranged laterally with respect to said longitudinal plane of said guide, characterised in that the apparatus further comprises at least one stationary support located at least at said operating stations, in that each of said carriages further comprises a respective contrast element cooperating with said stationary support and arranged to transfer the stresses applied by said operating means (40, 56) on said semi-finished devices to said stationary support, and in that the stresses applied by said operating means (40, 56) on said semi-finished devices are discharged by said contrast elements onto said stationary support without stressing said wheels of said carriages.