| 摘要 |
A cutting tool and method for enlarging an aperture in one member so that it is made concentric and of the same diameter as a reference aperture in an adjacent, underlying member. The tool utilizes a plurality of cutters each formed with a cutting edge for cutting away the material from the aperture to be enlarged. Each cutter is furthermore formed with a cam surface disposed for coaction with a thrust cone which acts thereon to urge the cutter cutting edge into contact with the periphery of the aperture being enlarged. Each of the cutters further includes an abutment surface which prevents further cutting of the aperture to be enlarged in wall areas aligned with wall areas of the reference aperture in the adjacent member; the abutment surface being adapted to engage a wall portion of the reference aperture when said wall areas are aligned thereby preventing the cutter cutting edge from coming into cutting engagement with the periphery of the aperture to be enlarged.
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