A grinding device for grinding a workpiece comprises: a main frame that rotates about a rotary shaft and is able to move in parallel on a horizontal plane vertically intersecting an axial direction; a first swingable frame that is disposed so as to be spaced from the main frame in the axial direction and is swingably mounted to the main frame; a pitch feed frame that is mounted to the first. swingable frame so as to be able to move in parallel on a horizontal plane intersecting the axial direction; and a second swingable frame that is swingably mounted to the pitch feed frame.

A grinding device for grinding a workpiece comprises: a main frame that rotates about a rotary shaft and is able to move in parallel on a horizontal plane vertically intersecting an axial direction; a first swingable frame that is disposed so as to be spaced from the main frame in the axial direction and is swingably mounted to the main frame; a pitch feed frame that is mounted to the first. swingable frame so as to be able to move in parallel on a horizontal plane intersecting the axial direction; and a second swingable frame that is swingably mounted to the pitch feed frame.

A grinding tool includes a substrate having a surface provided with a plurality of openings, and a plurality of grinding studs. Each of the grinding studs includes a stud portion and an abrasive particle attached to each other, the stud portions being respectively attached into the openings, and the abrasive particles protruding outward from the surface, each of the abrasive particles having a pattern cut across a tip thereof to define multiple apexes adjacent to one another.

A grinding tool includes a substrate having a surface provided with a plurality of openings, and a plurality of grinding studs. Each of the grinding studs includes a stud portion and an abrasive particle attached to each other, the stud portions being respectively attached into the openings, and the abrasive particles protruding outward from the surface, each of the abrasive particles having a pattern cut across a tip thereof to define multiple apexes adjacent to one another. In some embodiments, methods of fabricating a grinding tool are also described.

A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.