Patent ID: 7455569
Filing Date: 2008-11-25
Classification: B24B

Abstract:
1. A grinding and polishing machine for grinding or polishing optical workpieces to an optical quality, said machine comprising: at least one tool spindle with two ends and at least one workpiece spindle which can be adjusted relative to one another in directions perpendicular to one another; said tool spindle being constructed to hold a respective tool on the same axis at both ends of the tool spindle and being mounted in a spindle housing which can be pivoted about a pivot axis that runs through the center of gravity of the spindle housing and is arranged at right angles to the tool spindle in order to provide in each case one of the two tools for engagement with the workpiece and which can rotate the tool spindle into various defined angle positions with respect to the workpiece spindle; a drive system which, via the spindle housing, can drive the tool spindle about the pivot axis for the desired tool engagement with the workpiece and rotate the tool spindle about the pivot axis into various defined angle positions with respect to the workpiece spindle; and the drive system being a torque motor that is arranged on the same axis as the pivot axis and is CNC-controlled with regard to the angle of rotation about the pivot axis, the torque motor having a rotor which is permanently connected to the spindle housing via a pivoting shaft so as to directly drive the tool spindle without a gearing system.