Reamer for hollow shafts

A reamer for reaming a toric surface in the bore of a hollow shaft, which comprises a cylindrical casing insertable in said bore, means for centering said casing in said bore, a motor slidable axially in said bore and having a shaft coaxial with said bore, means for moving said motor axially of said casing, means for restraining said motor against rotation, a drive shaft rotatable coaxially in said casing and fixed to said motor shaft for rotation by said motor and for movement axially of said casing by axial movement of said motor, a cylindrical reaming head at an end of said casing, said reaming head being fixed axially relative to said casing but rotatable relative thereto by said drive shaft and having a diametrically extending recess, a mounting and actuating member fixed on an end of said drive shaft and disposed in said recess of said reaming head, said mounting and actuating member being rotatable with said reaming head and movable axially of said reaming head by axial movement of said motor and drive shaft relative to said casing, at least one tool holder received in said recess of said reaming head in juxtaposition to said mounting and actuating member, and a cutting tool carried by said tool holder, and cam means actuated by axial movement of said drive shaft and mounting and actuating member relative to said reaming head for moving said tool holder in said recess to move said tool along a path to cut a toric surface in said bore as said reaming head rotates while remaining fixed in an axial direction relative to said bore.