To surely finish grind the both of the inside face and the outer circumferential edge of a disc by roughly grinding them using a preliminary molding metal combined grinding wheel, and then finish grinding them using a molded CBN resin combined grinding wheel molded at site and remolded.
Edge is ground by a grinding wheel 32 including a lot of annular grooves 34 for engaged with edges of a work disc. Molding grinding wheels 56, 58 are attached to a work head spindle in the back of a chuck 30. When a work head 24 is lead in an arrow 60 direction, the work disc is engaged with one of the grooves 34 of the grinding wheel 32. When moving in the arrow 60 direction further, the work disc passes through the face 62 in the end of the grinding wheel assembly so that the molding grinding wheel 56 or 58 is engaged with appropriate grooves 34 of the grinding wheel 32.
FALKNER DERMOT ROBERT
MORANTZ PAUL MARTIN
PIERSE MICHAEL GEORGE
