Abstract: Unworked glass panes (9) are definitively positioned in a positioning station (15) by means of positioning stops (18) and transferred in a fixed position first to a grinding station (12) and then to a transfer station (7) by a translating device (20, 21, 22, 23). From the transfer station (7), the ground panes are transferred by means of a feeding device (6) to a drilling station (1) where holes are drilled into the panes. The finished panes are then returned to the transfer station (7) and are removed therefrom. A complete treatment is thus effected in a once determined position without any subsequent positioning. The drilling station is therefore free from any positioning means.