hold down device 8 and the axis of rotation 6 of the milling drum 5 is referenced with r 1 u2032 r 2 u2032 and r 3 u2032 r 1 u2032 lt r 2 u2032 lt r 3 u2032 in practice it has been shown that the gap width can vary over the whole periphery of the milling drum between 15 and 80 mm preferably between 25 and 50 mm it is not absolutely necessary for the gap width to increase continuously over the whole periphery of the milling drum in the present embodiment the gap width in the region of the hold down device 8 is larger than that at the lower edge 17 of the milling drum housing 7 in this embodiment lumps of removed material can still reach the milling drum housing which forms a gap with increasing gap width with the milling drum therefore in the present embodiment a breaker element may be positioned within the gap 15 extending in the direction of the axis of rotation 6 coarser material remaining in the gap 15 can be broken up with the breaker element fig8 shows a schematic representation of the guide of the hold down device 8 on the outside the hold down device has a guide rail 15 a 15 b on either side extending upwards over the periphery the guide rails 15 a and 15 b are guided in mounting elements 16 a and 16 b which are fastened on the machine.