Machine tool including vibration restriction means

A machine tool comprising;

• a cutting tool for cutting a workpiece;
• rotating means for rotating the cutting tool and the workpiece relative to each other;
• feeding means for feeding the cutting tool and the workpiece in a predetermined machining feeding direction;
• and a vibration means for relatively reciprocally vibrating the tool and the workpiece;
• wherein the cutting process is carried out by a relative rotation of the workpiece and the cutting tool, and feeding of the cutting tool in the machining feeding direction of the cutting tool, to thereby move the cutting tool continuously along a plurality of predetermined movement paths each having a different machining feeding direction;
• wherein the machine tool further includes vibration restriction means that operates as the movement of the cutting tool changes from one movement path of two consecutive movement paths to the other movement path, for restricting the reciprocating vibration for a predetermined period from a movement starting position of the one moving path of the two consecutive movement paths, and starting the reciprocating vibration after the lapse of said predetermined period, and
• wherein the movement of the cutting tool on the one moving path of the two consecutive movement paths is carried out by a feeding operation with the reciprocating vibration stopped.