An assembly for the assemblage of at least one winding group of a bar winding for an electric machine, said winding group comprising a plurality of bar conductors, each bar conductor of said plurality of bar conductors comprising a first leg, a second leg and a bridge portion connecting said first leg and said second leg to each other, each of said bar conductors being shaped so that the respective legs (6, 8) are mutually spread by a predetermined distance; - said assembly comprises an annular fixture which extends surrounding an axis (A-A) defining an axial direction either coincident with or parallel to said fixture rotation axis (A-A); - said annular fixture delimiting a plurality of slots (16, 16', 16") defining a circular array of slots arranged around said axis (A-A), each slot of said plurality of slots being adapted to receive at least one portion of either said first leg or said second leg of said bar conductor; characterized in that - said assembly comprises at least one guiding device which defines an annular containment housing, adapted to receive at least partially the legs (6, 8) of said plurality of legs (6, 8) of said plurality of bar conductors when they are housed in said plurality of slots (16, 16', 16"), forming at least one radial containment wall (39, 40) for said legs (6, 8); - wherein said annular containment housing of the guiding device directly faces said plurality of slots and is axially aligned with said plurality of slots; -- said assembly further comprises a conductor moving device, configured so as to be able to move a bar conductor of said plurality of bar conductors; - said conductor moving device comprises at least one handling element (22, 24), adapted to apply a handling action on at least either said first leg or said second leg of said bar conductor to insert at least one leg (6 or 8) inside the annular containment housing of the guiding device, moving it rotationally about a conductor rotation axis (Y-Y); wherein said conductor rotation axis (Y-Y) is substantially parallel to said fixture rotation axis (A-A). - said assembly comprises an annular fixture which extends surrounding an axis (A-A) defining an axial direction either coincident with or parallel to said fixture rotation axis (A-A); - said annular fixture delimiting a plurality of slots (16, 16', 16") defining a circular array of slots arranged around said axis (A-A), each slot of said plurality of slots being adapted to receive at least one portion of either said first leg or said second leg of said bar conductor; - said assembly comprises at least one guiding device which defines an annular containment housing, adapted to receive at least partially the legs (6, 8) of said plurality of legs (6, 8) of said plurality of bar conductors when they are housed in said plurality of slots (16, 16', 16"), forming at least one radial containment wall (39, 40) for said legs (6, 8); - wherein said annular containment housing of the guiding device directly faces said plurality of slots and is axially aligned with said plurality of slots; -- said assembly further comprises a conductor moving device, configured so as to be able to move a bar conductor of said plurality of bar conductors; -- said assembly further comprises a conductor moving device, configured so as to be able to move a bar conductor of said plurality of bar conductors; - said conductor moving device comprises at least one handling element (22, 24), adapted to apply a handling action on at least either said first leg or said second leg of said bar conductor to insert at least one leg (6 or 8) inside the annular containment housing of the guiding device, moving it rotationally about a conductor rotation axis (Y-Y); wherein said conductor rotation axis (Y-Y) is substantially parallel to said fixture rotation axis (A-A).