Knuckle deburring cutter and machining method of knuckle

A knuckle deburring cutter for removal of burrs of a knuckle having a lower ball head hole and, a pinch bolt hole and a pinch bolt slot in communication with one another, said knuckle deburring cutter comprising:

• a cutter shank having a cylindrical shape and defining a diameter being less than that of the lower ball head hole of the knuckle;
• a deburring cutter head disposed at an end of the cutter shank and having a spherical or ellipsoidal shape matching that of the pinch bolt hole of the knuckle;
• and
• a sharp-angle of lettering extending outwardly from an end of the deburring cutter head defining a width being less than that of the pinch bolt slot of the knuckle, whereby a maximum width of the sharp-angle of lettering is less than a minimum diameter of the deburring cutter head, and
• wherein a surface of the deburring cutter head is a smooth curved surface that matches the shape of the pinch bolt hole.