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 (A) of a longitudinal plane (B) and at least two rolling surfaces symmetrically arranged with respect to said longitudinal plane (B), - 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 (A), each of which comprises operating means 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 (B) 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 on said semi-finished devices to said stationary support , and in that the stresses applied by said operating means 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 (A) of a longitudinal plane (B) and at least two rolling surfaces symmetrically arranged with respect to said longitudinal plane (B), - 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 (A), each of which comprises operating means 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 (B) 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 on said semi-finished devices to said stationary support , and in that the stresses applied by said operating means on said semi-finished devices are discharged by said contrast elements onto said stationary support without stressing said wheels of said carriages . <EOS>