Chamfering device and chamfering method

A chamfering device configured to be attached to a rotatable main shaft of a machine tool and to extend, along a rotational axis of the main shaft, from a proximal end to an opposite distal end, the chamfering device comprising:

• a main body including, at a proximal end side thereof, a shank to be attached to the main shaft of the machine tool, the main body including, at a distal end side thereof, a shaft portion whose longitudinal axis extends in a direction of the rotational axis;
• a movable body whose proximal end portion is mounted to the shaft portion so as to receive the shaft portion therein, the movable body being configured to rotate together with the shaft portion and be movable relative to the main body in the rotational axis direction;
• an urging member configured to urge the movable body in a direction toward the distal end of the chamfering device;
• a chamfering tool mounted to a distal end portion of the movable body and configured to rotate together with the movable body to perform chamfering on an edge portion of a workpiece;
• and
• a following member mounted to the movable body such that a position of the following member relative to the movable body in the rotational axis direction is invariable and the following member is rotatable relative to the movable body, the following member being configured such that a distal end thereof comes into contact with a surface of the workpiece.