Patent ID: 6579155
Filing Date: 2003-06-17
Classification: B24B

Abstract:
A method of form machining the peripheral edge of spectacle lenses having a driven spectacle-lens holding shaft holding the spectacle lens and a cutting tool movable in a controlled manner in relation to the spectacle-lens holding shaft, comprising the steps:measuring the torque of the spectacle-lens holding shaft, form machining the peripheral edge of the rotating spectacle lens with a predeterminable, adjustable force of the cutting tool if and as long as the torque is less than or equal to a predetermined, set value, reducing the cutting-tool force acting on the spectacle lens by reducing the rotational speed of the spectacle-lens holding shaft, if need be until it stops, if and as long as the torque exceeds the predetermined value, wherein the rotational speed of the spectacle-lens holding shaft is reduced in proportion to the amount by which the predetermined value of the torque is exceeded.