A method for producing a conductor segment includes: passing a copper bar in a predetermined direction of movement through a rotating first work roll and a second work roll rotating in the opposite direction to the first work roll; rotating a first backup roll in the opposite direction to the first work roll to brace the first work roll against the copper bar with an adjustable first force directed perpendicularly to the direction of movement; rotating at least one second backup roll in the opposite direction to the second work roll to brace the second work roll against the copper bar with an adjustable second force directed counter to the first force; and adjusting the first and second forces such that the work rolls give the conductor bar a thickness that varies along its length. Also described is a corresponding device and a corresponding method for producing an electric machine.