Abstract: A rotatable toolholder is provided having a stationary coolant feed system for directing a through-center, non-rotating coolant stream to a coolant conducting bore in a rotating cutting tool. The rotatable toolholder comprises a stationary housing, a driven shaft having an output end rotatably mounted in the housing, and a tool coupling rotatably mounted on an opposite side of the housing for holding and rotating the end of a cutting tool. The coolant system of the toolholder includes a nozzle assembly stationarily mounted within the housing and having a nozzle for directing a non-rotating stream of coolant into the coolant conducting bore of the tool, and a stationary conduit for conducting a coolant flow from a source of pressurized coolant to the nozzle assembly while isolating the coolant flow from the rotating components within the housing. A transmission assembly is provided within the housing for transmitting rotary power from the driven shaft to the tool coupling.

Abstract: A rotary tool connecting assembly is provided for use as a tap driver for transmitting torque to a tap. The assembly comprises an adapter receiver for receiving and securing a tap, a chuck body having one end which is detachably connectable to the spindle, and an opposing end having an axially aligned recess for slidably receiving the adapter receiver, and a mechanism for transmitting torque from the chuck body to the adapter receiver while allowing the receiver to freely axially slide within the recess of the chuck body that includes a plurality of linear roller bearings disposed between a single flat wall present on the side of the receiver and a flat bearing wall that defines a portion of the recess in the chuck body. The flat bearing wall of the chuck body is provided by a bearing insert which is compliantly seated within a slot in the chuck in order to keep its bearing wall parallel with the flat bearing wall of the adapter receiver when substantial amounts of torque are applied to the assembly.