Patent ID: 7985120

Claim:
A method for grinding a workpiece, comprising: rotating a cylindrical grinding wheel about a rotational axis being parallel to the rotational axis of the workpiece; moving the grinding wheel relative to the workpiece at least in one of a first direction being perpendicular to the rotational axis of the workpiece for grinding the workpiece at a cylindrical surface of the grinding wheel and a second direction being parallel to the rotational axis of the workpiece for grinding the workpiece at an end surface of the grinding wheel being perpendicular to the rotational axis of the grinding wheel; superimposing a vibration signal, including a plurality of frequency components, onto a driving signal outputted to a workpiece rotating means for rotating the workpiece; and rotating the workpiece about a rotational axis, while changing a circumferential speed of the workpiece at random intervals, on the basis of the driving signal superimposed onto the vibration signal.