Abstract: Method for renewing grinding wheel surfaces in a machine for grinding ophthalmic lenses, comprising one or more diamond wheels (2,3,4,5), gripping members (7,8) capable of receiving an ophthalmic lens, and control. Once wheel wear is detected, the surface is renewed using an abrasive disk (9) fitted to the grinding machine in place of a lens in the gripping members. The invention also concerns a disk (9) for carrying out the method, with at least the peripheral surface consisting of abrasive material. A machine for gripping ophthalmic lenses and carrying out the method is also described.

Abstract: The microwave torch comprises at least one gas supply conduit (1, 2); a resonant cavity (3) forming around the conduit a sleeve open adjacent to the outlet of the conduit and including a lateral opening (4); a transition coaxial structure perpendicular to the sleeve comprising, on one hand, an outer tube (5) connected to the lateral opening (4) of the sleeve and, on the other hand, an inner element (6) having one end (20) in contact with the conduit and an opposite end which is in contact with the outer surface of a wave guide (8) and carries a transition member (7) disposed in the wave guide; said wave guide supplying microwave energy and having a rectangular section and perpendicular to the coaxial structure (5, 6) being provided with an opening (27) where the outer tube (5) of the coaxial structure is connected; shielding gas supply means in the wave guide and/or the coaxial structure and/or the sleeve; optionally tuning means; and optionally plasma igniting means.