Method of edging lenses

In a method of grinding the peripheries of articles such as ophthalmic lenses and the like with a grinding wheel having a grinding surface and an axis of rotation, comprising the steps of detecting the height of discrete axial positions on the grinding surface between opposite sides thereof and generating signals having values representative thereof;

• comparing the values of said signals and generating an indication of the axial position on the grinding surface whereat said signals represent greatest height;
• and moving the periphery of an article in accordance with said indication against the axial position of greatest height.

A method of grinding an article, comprising the steps of rotating a grinding wheel, having a grinding surface which is subject to wear, about its axis;

• supporting and moving the article against the grinding surface;
• detecting the axial position of the highest point on the grinding surface between opposite sides of said surface;
• and controlling said supporting and moving step in accordance with said detecting step to locate the article opposite from and to move the article against the highest point position.

A method of grinding the peripheries of articles such as ophthalmic lenses and the like, comprising the steps of rotating a grinding wheel, having a grinding surface which is subject to wear, about its axis;

• supporting a lens generally along an axis thereof and moving the edge of the lens against the grinding surface;
• detecting the axial position of the highest point on the grinding surface between opposite sides of said surface;
• and controlling said supporting and moving step in response to said detecting step to locate the edge of the lens opposite from and to engage the edge of the lens with the grinding surface at the axial position whereat the surface is highest, whereby the grinding surface wears evenly and uniformly.