A grinding wheel dressing assembly includes a driving gear rotatable about a central axis and a dressing ring engaged with the driving gear. Rotation of the driving gear about the central axis results in rotation of the dressing ring about an offset axis, which is offset from the central axis. The dressing ring includes a contact surface generally normal to the offset axis and adapted to remove dull CBN particles from a substantially planar grinding surface of a grinding wheel that comes into contact with the contact surface.