PURPOSE: To cope with the curved surface of a material to be ground whichever it is a recessed curve surface or a projecting curve surface and bring the whole operation surface of a grinding material layer into contact with curved surface of a material to be ground uniformly.
CONSTITUTION: In the case of a grinding tool having a structure in which a grinding material layer 1 of a circular plate shape is formed and grooves to run cooling water to the surface of the grinding material layer 1 are provided and the grinding material layer 1 is affixed to a surface fastener 4 through a backup sheet, the operation surface of the grinding material layer 1 of the circular plate shape is formed so that its center lengthwise section may possess a recessed or projecting curve surface. From the operational viewpoint of the grinding material layer 1, it is convenient for the output transmission of the output spindle of a pneumatic tool or a motor-driven tool to form the same curved surface in regard to its grinding tool fitting bed. By using its tool properly according to the state of the recess/projection of a ground material curved surface, the ground material curved surface and the contact surface of the grinding material layer of a tool can be taken widely.
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