Patent ID: 7213591

Claim:
A groove cutting tool in which a disc-like cutter blade is fixed to a spindle of a rotary electric tool by tightening a lock nut, comprising: a first guide plate which is a disc-like member to be attached to the spindle on the side of the electric tool of the cutter blade such that it is capable of rotating freely while the side face of the disc-like member makes contact with a reference surface of a cutting object so as to guide a cutting direction; an inner flange located between the first guide plate and the cutter blade so as to specify a distance X between the reference surface of the cutting object and a groove cut in the cutting object; and a second guide plate, which comprises a disc-like member to be attached to a side of the cutter blade opposite said inner flange, wherein a peripheral end face of the disc-like member contacts a side face of the cutting object so as to stop movement in the cutting direction to specify a cut groove depth Y wherein a bearing is positioned between said cutter blade and the spindle and wherein said first guide plate comprises a disc-like member having a diameter larger than the cutter blade and having a bearing fitting hole located in a central portion thereof, said bearing being fitted into said bearing fitting hole.