Abstract: A vitrified bond CBN point grinding wheel with coarse grinding area slope angle θ was proposed， which owned higher removing rate and machining accuracy compared with the conventional wheels. The design and manufacture principle of the novel grinding wheel was studied. Stepped shafts of QT700 were ground using the wheels with different coarse grinding area slope angle θ under the conditions of a series of grinding parameters. The surface qualities of the workpieces were observed by means of VHX1000E microscopic system and Micromeasure system， with the surface roughness measured. The effect of the grinding parameters on surface roughness was investigated， and the surface roughness of workpieces， which were ground using the wheels with different slope angle θ under identical conditions of the grinding parameters，was compared.

Key words: coarse grinding area slope angle, point grinding, grinding wheels fabrication, grinding parameter, surface quality