pot-shaped, the device comprises a grinding ring (4.3) in the region of the pot edge, the device comprises at least one channel (5.1, 5.2, 5.3) for supplying a cooling and lubricating medium, the channel (5.1, 5.2, 3) has an inlet for admitting the medium and an outlet for the medium, characterised in that the outlet for the medium is aligned directly against the cutting edge of the blade (2.1 ...
