Machining apparatus

An in-feed machining apparatus configured to machine an outer peripheral surface of a rotating tapered roller, the machining apparatus comprising:

• a rotating mechanism having a lateral pair of rollers on which the tapered roller is mounted, the rotating mechanism rotating the pair of rollers;
• a grinding stone that is brought into contact with the outer peripheral surface of the tapered roller mounted on the pair of rollers;
• and
• a mechanism configured to adjust relative positions between the tapered roller and the pair of rollers, the mechanism adjusting at least one of a tilt angle of the pair of rollers relative to a horizontal line, a lateral distance between the pair of rollers, and an opening angle between centerlines of the pair of rollers by independently moving each of the pair of rollers, so as to adjust the at least one of the tilt angle of both of the pair of rollers, the lateral distance of both of the pair of rollers, and the opening angle of both of the pair of rollers, wherein
• each roller of the pair of rollers is shaped like a truncated cone, small-diameter portions of the pair of rollers come into contact with a small-diameter portion of the tapered roller, and large-diameter portions of the pair of rollers come into contact with a large-diameter portion of the tapered roller.