CNC controlled spectacle lens rim grinder with coaxial half-shafts - uses grinding wheel movable in two directions for lens shaping, and milling or grinding tool for finishing of rim

摘要

The lens (12) is held and rotated by the half-shafts (11) while the shaping is performed by a grinding disc (3) rotating at a higher speed about a parallel axis (4). The desired shape is read by a computer (14) from a memory (15) and the movements of the tool carriages (6,9) are adjusted (19) accordingly. A conical grinding or milling head (25) on a shaft (21) mounted in ball-bearings in a cylindrical sleeve (27) is applied to the rim of the lens with gentle pressure. A finger miller or diamond-tipped tool (22) may be substd. to make a groove around the rim. ADVANTAGE - Grooves or furrows can be machined in any type of lens with grinding tool following spatial curve of rim.