Patent ID: 7997953

Claim:
A precision machining method using a precision machining system comprising a first rotator for rotating a workpiece to be ground, a first base for supporting the first rotator, a second rotator for rotating a grinding wheel, and a second base for supporting the second rotator, at least one of the first base and the second base further comprising movement adjusting means capable of moving one of the first and second bases relative to the other of the first and second bases, the movement adjusting means being capable of selectively performing control based on either an amount of movement of one of the first and second bases relative to the other of the first and second bases or a pressure between the workpiece to be ground and the grinding wheel, the method comprising: a first step of producing an intermediate ground workpiece by grinding the workpiece with an intermediate-grinding wheel on the second rotator; and a second step of producing a final ground workpiece by grinding the intermediate ground workpiece with a final-grinding wheel on the second rotator; wherein the intermediate-grinding wheel is a diamond grinding wheel; wherein the final-grinding wheel is a grinding wheel for CMG that differs from the intermediate-grinding wheel; wherein in the first step, feed of at least one of the first rotator and the first base, and the second rotator and the second base, is controlled in multiple stages with different feed speeds according to the control based on the amount of movement of one of the first and second bases relative to the other of the first and second bases, and wherein in the second step, movement of at least one of the first rotator and the first base, and the second rotator and the second base, is controlled with a constant pressure between the workpiece to be ground and the final-grinding wheel or in multiple stages having different constant pressures between the workpiece to be around and the final-grinding wheel.