Abstract: A tooling assembly comprises a holder and a tool head releasably mounted thereon. The holder includes a forwardly projecting frusto-conical tongue which is tightly received within a correspondingly shaped socket of the tool holder. An actuator is slidably mounted within the holder and is retained within the tool head by means of a bayonet-type coupling. A pair of locking wedges is mounted in the holder and actuated by means of a differential screw to push the actuator rearwardly against a spring bias in a manner drawing the tool head tightly against the holder. Fluid channels in the holder body, actuator, and tool head communicate after the tool head has been mounted on the holder, in order to conduct flushing fluid to flush cuttings from the hole being cut.

Abstract: A retractable rotary cutting tool is disclosed in which the tool is adapted to be connected to a chuck or a tool holder of a machine tool such as an automobile tool changer on a numerically controlled machining center or the like. The cutting tool support is arranged to have a cutter which is recessed into the support and is pivotally connected to an actuating shaft coaxially within the tool support, which shaft reciprocates relative to the tool support when a thrust collar located about the tool support engages the work or another fixed external surface and will withdraw when the thrust collar engages for a second time an external surface or the work.

Abstract: The present invention relates generally to spade drills and more particularly to an indexable spade drill blade which is adapted to be clamped in the clamp slit of a boring bar or holder and which may be readily reversed so that an unused cutting edge may be brought into play for further boring when wear has taken place on the cutting edges. Essentially the spade cutting blade is formed with an eccentric to permit indexing and must be used with an appropriate boring bar or holder which has a shape such that the cutting point of the eccentric blade is brought on the shank center line of the boring bar or holder.