Centerless grinder and wheel truing device therefor

摘要

A stem (24a) and a valve face (24b) of an engine valve (24) are ground by first (4) and second (21) grinding wheels respectively. A motor (20) for driving the second grinding wheel is mounted on a first plate (15) movable by a servomotor in a direction perpendicular to the axis of the wheel (21), and under the first plate (15), a second plate (14) is disposed to be movable in a direction parallel with the axis of the wheel (21). The valve face (24b) is ground obliquely by the second grinding wheel (21) by moving the two plates (14,13). The first grinding wheel (4) is trued by a first dresser (46) movable in directions parallel with and perpendicular to the axis of the first grinding wheel (4). The second grinding wheel (21) is trued by a second dresser (60) provided at the end of a support strut (52).