Abstract: Apparatus for coupling a tool holder to a machine tool spindle wherein the tool holder is fitted to a coupling interposed between the tool holder and the spindle. The coupling and the tool holder have separable fasteners for separably joining the tool holder and coupling together. The coupling can accommodate tool holders having dissimilar fasteners and the tool holder can be fitted to couplings having dissimilar fasteners.

Abstract: A tool holder assembly is provided with a spindle adapter socket member having a threaded end with a nut threaded thereon, the nut having a clamping configuration at a bottom thereof for clamping a tool adapter to the socket. The socket member is provided with an outer diameter toothed ring and the nut is provided with a mating toothed member movable between toothed ring engaging and tooth ring disengaged positions to lock the nut in fixed rotational position to the socket member.

Abstract: A Tap Driver Assembly for use between a spindle that is adapted to provide a coolant and a tap that is adapted to conduct such coolant therethrough, the tap driver assembly including a body in which a nose is slidably guided, a collet clamped by a nut in such nose, a slidable drive connection between the body and the nose which enables relative axial movement while providing an angular drive, spring means acting between the nose and the body so that the feed of the tap could lead or lag the feed of the spindle, and a fluid passage in the body leading from the spindle in bypassing relation to the slidable drive connection, bypassing the spring means, and extending through the nose, axially into the collet to the tap.