Abstract: A precision heavy duty indexer characterized in that the indexing member thereof is positively locked to the indexer housing in desired precise axial, radial and angular indexed position by interengaged gear means of said indexing member and said housing, and is unlocked for indexing movement by disengaging said gear means, the gear means of said housing being carried by the outer peripheral portion of a laterally flexible pneumatic or hydraulically-actuated diaphragm having its inner peripheral portion fixed to the housing.

Abstract: An adjustable floating reamer characterized by its relatively great length and small diameter embodying a closure cap for the diametrically slotted end of a shank member which has a long and thin tubular portion which closely embraces and supports the slotted end of the shank member and which has a closed end in abutting engagement with the slotted end of the shank member to define therewith a rectangular slot in which overlapping reamer blades are slidably supported for radial adjustment and for radial floating movement about a pivot which is spaced a great distance from the blades so that no binding action occurs during the floating movement of the blades during use of the reamer.

Abstract: A floating tool holder for a reamer or like tool characterized in that a shank member with respect to which a tool drive member has a floating drive connection has a centralizing pin fixed therewithin which provides a spring centering device to yieldably position said drive member coaxially of said shank member, and which axially retains said drive member for lateral floating movement without axial play.