Abstract: A dresser to be mounted on a grinding machine uses a ring-shaped dressing wheel approximately coaxially mounted with the workpiece axis around the tailstock to position the dresser contact region between the grinding wheel axis and the workpiece axis on the same side of the grinding wheel as the workpiece. Errors in the final size of the grinding wheel after being dressed due to thermal expansion and contraction of the grinding machine are reduced or eliminated. The dresser is angularly adjustable to accommodate the pitch angle of the grinding wheel during thread grinding operations.

Abstract: A grinding wheel radius dresser including a dresser housing, a spindle having a tapered outer bearing surface, a drive means for rotating the spindle and a damage resistant bearing. The bearing includes a tapered inner bearing surface produced by molding a low friction bearing material to match the tapered spindle bearing surface, and is mounted in the housing with the spindle bearing surface in rotating contact with the inner bearing surface. The bearing is preferably spring mounted to slide longitudinally into the housing in the event of an impact further minimize the likelihood of any damage.