Method for machining a surface of an optical lens

A method of determining movement data representing movement of a machining tool of an optical lens lathing device for machining an optical surface of a set of optical surfaces,

• the set of optical surfaces comprising at least one non rotationally symmetrical surface,
• the optical lens lathing device comprising a movement axis allowing relative movements between the machining tool and the optical surface, the movement axis comprising at least four movement axes comprising:
• a first rotation axis,
• a parallel translation axis substantially parallel to the first rotation axis,
• a perpendicular translation axis substantially perpendicular to the first rotation axis, and
• a second rotation axis substantially perpendicular to
• a plan comprising the parallel translation axis and the perpendicular translation axis,
• the optical lens lathing device being configured to drive in rotation the optical surface to be manufactured about the first rotation axis and to drive the machining tool relative to the optical surface along the parallel translation axis and the perpendicular translation axis and in rotation about the second rotation axis,
• the method comprising:
• a greatest radial slope amplitude determining step during which a greatest radial slope amplitude of the optical surface of the set of optical surfaces is determined;
• a machining tool selecting step during which the machining tool having a window angle greater than or equal to the greatest radial slope amplitude of the optical surface of the set of surfaces to be manufactured is selected;
• and
• a movement data determining step during which movement data representing movement of the selected machining tool along the perpendicular translation axis and the parallel translation axis and about the second rotation axis so as to machine the optical surface are determined and synchronized with an angular position of the optical surface driven in rotation about the first rotation axis.